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Current Topics:

Category
 Process: 0. Corrosion. Compatibility, Choosing a Finish
 Preparation: 1a. Mechanical Prep 1b. Chemical Pretreatments 1c. Masking & Racking
 Inorganic Finishing: 2a. Anodizing & Light Metals 2b. Electroplating & Electroforming 2c. Electroless Plating
2d. PVD, CVD, Vacuum Processes 2e. Galvanizing, Hot Dipping 2f. Black Oxide, Bluing, Coloring
2g. Other Inorganic Finishing Processes
 Organic Finishing: 3a. Electropainting, Autophoretic 3b. Powder Coating 3c. Lacquers, Clearcoats
3d. Painting, Printing, Adhesives, Organic Coatings
 Post-treatments: 4a. Chemical Post-treatments 4b. Baking & Non-chemical Post-treatments 4c. Stripping, Reworks, etc.
 Supporting Issues: 5a. Analysis, Lab Technique, QA/QC 5b. Water, Wastewater, Pollution 5c. Safety, Emissions, Toxicity
5d. Plant & Process Engineering 5e. Software, Specs, Books, Stats 5f. World Wide Word Of The Week
5g. REACH, RoHS, E-O-L, etc. 5h. Mostly metallurgy
 Non-industrial: 6a. Hobbyists, Enthusiasts, Artists 6b. Research, Thesis work 6c. K-12 Science Projects, Elementary to High School
 Not Metal Finishing: 7. Off Topic, but Interesting

0. CORROSION, COMPATIBILITY, CHOOSING A FINISH . . .

37526. Want gold colored finishes without use of gold (April 20)
47731. Rust on 304SS in Water Treatment Plant (April 19)
28470. Treatment for Concrete Release on Steel Forms open Q. (April 18)
58242. GI mesh vs. MS for outdoor cat kennel (April 15)
02310. Conductive Coatings for Brass and Copper (April 10)
03354. How to avoid corrosion in SS316 material in presence of chlorine gas (April 3)
03606. Corrosion resistant coating for 1018 Steel motorcycle parts (April 3)
25010. Galvanized boat lift corrosion camera (April 2)
07897. Galvanic compatibility of aluminum and copper (March 30)
27848. Greenhouse Wire rack shelving for mushroom growing: Galvanizing or Epoxy (March 5)
24405. Switch fastener from zinc flake to "galvanic zinc coating" (March 5)
03066. Aluminum Anodizing vs. Powder Coating (February 28)
60698. Need help with a coating for my application - Threaded hole in steel cap (February 24)
27167. Stainless hardware is destroying aluminum pool pump camera (February 18)
43765. Galvanic compatibility of Monel wire and 304 stainless in sodium hydroxide (February 2)
34441. Plating vs. vacuum metallizing vs. chrome-look painting of plastic open Q. (January 24)
60534. Is rust contagious? (January 23)
16063. 4XX Stainless Screws vs. Zinc Plated for Windows and Doors? (January 3)


1. PREPARATION . . .

    1a. MECHANICAL PREP
    [GRINDING, POLISHING, VIBRATORY FINISHING, BUFFING, HONING]

44536. Fire safety of Shot-blasting machines (April 13)
28824. Grinding HVOF coatings (April 12)
26572. Tumble polishing stainless steel (April 10)
06434. Need Random Surface Finish on Stainless Steel (April 5)
45366. Must stainless be full hard to obtain mirror finish? open Q. (March 29)
06753. Convert between Rz and Ra (March 24)
60704. Aluminium Tube OD finishing (March 2)
60683. Sandblasting iron with copper slag open Q. (February 6)

    1b. PRETREATMENTS
    [PICKLING, PASSIVATION, PHOSPHATIZING, CLEANING, ELECTROPOLISHING, ACTIVATION]

01655. Chemical polishing of stainless steel (April 10)
13862. What Limit to Use for Iron Content in HCl Pickling (April 9)
34052. Manganese phosphating coating failure on rub test what is the reason? open Q. (April 7)
20075. Can phosphatized iron casting last several years? (April 5)
46618. Is Citric acid for SST passivation 40CFR433? (April 4)
13366. Problems and solutions in zinc phosphating open Q. (March 31)
41404. Parts rusting after zinc phosphating open Q. (March 30)
47351. Free and total acidity in phosphating open Q. (March 21)
11268. Pretreatment sequence for zinc plating (March 18)
31148. Sulfuric acid and hydrogen peroxide pickling of copper? (March 15)
60708. Phosphatizing of cast iron sprockets open Q. (March 2)
39277. Pickling inhibitors (February 24)
15151. Stainless steel etching -- How To open Q. (February 21)
28680. Citric Acid vs. Nitric Acid Passivation (February 12)
32106. Using HCl to remove rust (February 12)
60685. How to etch Chromium film on 304SS without creating any roughness? open Q. (February 7)
47682. Electropolishing chrome cobalt alloys (January 24)
13405. Electropolishing Hastelloy open Q. (January 19)
50566. Titanium etch chemical ratios (January 18)
13628. Passivating stainless steel causes loss of mirror polish (January 18)
18495. Electropolishing of stainless steel: solution composition open Q. (January 8)

    1c. MASKING, RACKING, TAPING, PLUGGING, PHOTOSENSITIVE MASKS

58316. Liquid masking for anodizing (February 21)


2. INORGANIC FINISHING PROCESSES . . .

    2a. ANODIZING AND LIGHT METAL TREATMENTS (Aluminum, Magnesium, Titanium)

09494. Electroless nickel and hard anodizing on same part open Q. (April 20)
26660. Anodizing Automotive Brightwork Q&A's open Q. (April 19)
06930. Milky grey aluminum etch bath - can it be fixed? (April 18)
41023. Cloudy finish on Chemical bright anodized profiles open Q. (April 15)
45421. Black spots in anodized aluminum (April 10)
01217. Dyeing after dichromate seal (April 9)
44433. "Close Looping" an Aluminum De-Ox System (April 9)
60727. Chromate Conversion Coating Post Packaging (April 9)
22139. Satin Anodized Aluminum camera (April 7)
03651. Chromic Acid Anodize with Stainless Racks? (April 6)
01081. Why does Alloy 2024 Burn in Hard Anodizing? open Q. (April 4)
28128. MIL-A-8625 Type II, chromate sealed parts have white patches camera open Q. (April 4)
10820. Salt spray test for anodized aluminum (March 31)
50143. Aluminum Sheet Warping after Chromating open Q. (March 24)
56597. Can Alodine/Iridite/Chromating be done with steel inserts already in place? (March 24)
33883. Problems in Plating on Die-cast Aluminum (March 18)
24066. Importance of nickel acetate in anodize sealing open Q. (March 17)
32786. Prevention of white rust during production of aluminum strip open Q. (March 17)
18494. Black anodizing problem: some parts purple but thickness verified (March 13)
15232. Does anodised aluminium seal on its own? open Q. (March 7)
60707. Color Variation in Titanium Gold Anodize (March 6)
15733. Aluminum pretreatment for powder coating (March 3)
43451. Color variations in Chem film MIL-DTL-5541 class 1A gold (February 21)
04408. How to make alum from anodizing solution open Q. (February 13)
58771. Spotting on aluminum parts with chromate finish (February 13)
21875. Corrosion on 2024 Chromate, Salt Spray Test (February 9)
06885. Problems & Solutions in Passivation of Titanium (February 3)
01265. Titanium anodizing solution hydrolyzes open Q. (January 27)
41079. Titanium Deox/etch open Q. (January 24)
15825. After re-working the chem-film, the anodizing dye is bleeding (January 19)
60670. Corrosion of vehicle Aluminium accessories vip open Q. (January 19)
27719. Clear anodized aluminum appearance flaw -- looks galvanized open Q. (January 11)
22258. vip Brown stains on chromic acid anodising camera (January 6)
45157. Phosphate Fluoride Treatment of Titanium using Aluminum Racks open Q. (January 4)
27504. What causes large crystals to form in the anodize tank? camera (January 3)

    2b. ELECTROPLATING and ELECTROFORMING

00476. Alkaline non-cyanide zinc plating vs. acid zinc (April 19)
00706. Starting Nickel/Chrome plating. Is it worth it? (April 19)
01871. Hard chrome cylinder pistons rusted & pitted in a few weeks camera (April 19) 28746. Trivalent Cr vs. Hexavalent Cr, difference please (April 19)
22644. Upper limit on plating speed with extreme agitation open Q. (April 18)
41906. Dummying Nickel Contamination from Copper Cyanide Bath (April 17)
25024. Electrodeposition of Titanium (April 15)
44771. Acid Copper Plating Problems (April 15)
29188. Plating of Internal Threads (April 11)
46258. Is clear zinc chromate discoloration permissible? (April 10)
60693. Microcrack density control in hard chrome plating open Q. (April 10) vip
53424. Cleaning a Gold Plated Brass Necklace (April 10)
50922. Platinized titanium anodes for hard chrome plating? (April 9)
22092. Black Ruthenium or Alternatives for Jewelry Plating open Q. (April 9)
53532. Rack marks on alkaline zinc bath / Pre-cleaning hot rolled steel open Q. (April 4)
00907. Zinc plating porous sintered metal parts (April 4)
01114. What voltage for white bronze plating? (April 4)
40492. Satin nickel plating problem open Q. (April 3)
04846. Acid zinc plating of zinc diecastings open Q. (April 3)
04996. Poor hard chrome plating on steel molds for melamine open Q. (April 2)
11706. Bright nickel stardusting (March 29)
12525. Problems in tin-lead plating (March 29)
28708. Silver striking problem: coating is white (March 29)
45300. Estimating Surface Area for Electroforming (March 29)
00768. Black spots on electroless nickel and hard gold open Q. (March 27)
57351. Cadmium / Cyanide Bath Maintenance open Q. (March 22)
28851. Some problems with Process of Zinc-Nickel Plating (March 15)
30106. Salt spray test for zinc plated part (March 14)
47484. Chrome plating I.D. of Tube (March 8)
51293. Plating blind bores open Q. (March 8)
60711. Flip Chip Package Plating open Q. (March 5)
10089. Cadmium plating for buildup of undersize part open Q. (March 1)
60692. Chrome Plating Steel Parts Scrap Rate (February 28)
54564. Q&A's on Copper plating of gravure cylinders open Q. (February 23)
02593. Porous Pots to Clean Chrome Plating open Q. (February 23)
15756. Hard Chrome Plating Problems: Can't remove every spot from substrate open Q. (February 21)
05358. Bio-fouling of gold plating tank (February 17)
30106. How many salt spray hours for zinc plating without chromate? open Q. (February 16)
11800. Dots when acid copper plating open Q. (February 14)
03778. Ni-Cr plating on diecastings -- too much Cu, not enough Ni? (February 12)
34692. Imitation Gold Baths open Q. (February 11)
10242. Phosphating a zinc plated surface (February 11)
04836. Function of Chloride in Acid Copper Plating Bath (February 9)
29662. The Role of Sulphuric Acid in Copper Plating (February 9) )
32077. Black spots in zinc plating (February 9)
29495. Help with Zinc plating questions (February 9)
25432. Zinc-Nickel Plating with high nickel has poor appearance (February 5)
34321. Differences between chloride (acid) and alkaline zinc plating (February 5)
46795. Discoloration of black zinc plated parts camera (February 5)
40095. Acid Zinc / Potassium Zinc Chloride Plating: Problems & Solutions open Q. (February 4)
24506. Copper plating steel grounding (earthing) rods camera open Q. (February 3)
52598. Nodular buildup at edges with chrome plating open Q. (January 31)
36277. Hard chrome hole edge has a yellow color (January 29)
37456. Blue Zinc Plating is Rusting after 3 Monthsopen Q. (January 29)
35480. Zinc plating and rust (January 24)
35202. Want anodic anti-tarnish treatment for silver plating open Q. (January 24)
13098. What is "Plating Grade" Sodium Stannate? (January 17)
17838. Silver Plating on Aluminum: Blister / Bubble Problems open Q. (January 17)
34107. Whitewashed areas in alkaline zinc plating camera open Q. (January 17)
03634. Pinhole in silver plating on etched copper leadframe (January 17)
21285. Copper plating near middle of long rods is not thick enough (January 17)
30879. Plating thickness variation in hard chrome plating (January 15)
60664. Zinc plating is either too thin or it bubbles (January 12)
36161. Porosity causes tiny blisters in plating (January 12)
01216. Hydrogen Embrittlement in Plating open Q. (January 4)
54953. Gold plating vs Silver plating for electrical contacts (January 3)

    2c. ELECTROLESS PLATING, PLATING ON PLASTICS, IMMERSION PLATING

16897. Problems doing Electroless nickel plating on stainless steel (April 17)
05519. Chrome plating of ABS plastic: "Dot skip" plating problem open Q. (April 2)
20973. Problems & Solutions in ENIG (Electroless nickel / immersion gold) (April 2)
13422. Immersion vs. autocatalytic vs. 'activating disk catalyzed' gold plating (March 29)
38067. Electroless nickel plating on aluminum -- Porosity problem open Q. (March 29)
11290. Difference between Nickel plating and Electroless Nickel plating (February 21)
57472. Go gauge enters I.D. before electroless nickel plating but not after (February 21)
18471. Electroless gold directly on ABS? open Q. (February 13)

    2d. PVD, CVD, ION IMPLANTATION, VACUUM PROCESSES

34053. Titanium nitride doesn't adhere to glass (April 10)
49660. Brass plating on stainless steel? open Q. (April 9)
28527. Base coats and top coats for vacuum metallizing open Q. (March 17)
13026. Integrated coatings on graphite heat exchangers open Q. (February 13)
45654. Argon regulator for desktop sputter coater (February 9)
09739. Applying Nickel to Aluminum by PVD (January 27)
12049. Power Supply for Sputter Cleaning? (January 26)
28527. Base coats and top coats for vacuum metallizing open Q. (January 12)

    2e. GALVANIZING, ALUMINIZING, HOT TIN DIPPING

34714. Controlling hot dip galvanized steel production for dullness or shine open Q. (April 18)
29835. Galvanizing 101: pre-galv vs. hot-dipped galvanized video open Q. (April 15)
42394. Furnace dew point for NOF galvanizing line open Q. (April 5)
25997. Prevention of white rust on galvanizing open Q. (March 31)
51810. Controlling Thickness in 275 g/m2 Galvanizing open Q. (March 29)
41367. Zinc consumption control open Q. (March 19)
54149. How Can I Reduce and Remove Zinc Dross (March 19)
38915. Peeling problem in galvanizing of steel (March 19)
41930. Anodized aluminum window frames screwed to a steel building (March 14)
54638. Kettle surface oxidizes immediately, leaving oxide lines on galvanized coating camera (February 19)
13211. Should I use nozzles for turbulent flow in electrolytic tank? (February 11)
41209. Flux filtering machine? open Q. (February 2)
45719. How much dross in galvanizing? (January 27)
46161. Removing white spots / storage stain on galvanized metal open Q. (January 19)
50428. How to make Galvanizing Flux? (January 15)

    2f. BLACK OXIDE, BLUING, COLORING, PATINATING, NITRIDING

60737. Stellite-6 Gets White Patches when Nitriding open Q. (April 19)
47183. Manganese phosphating on gun barrels is too light and thin (April 6)
03278. Thickness measurement of black oxide coatings open Q. (April 3)
36484. Black Oxide plating on Inconel 718 possible? (March 23)
48674. Are these brown spurs "blackodized"? camera open Q. (March 2)
34789. Difference between 'galvanized' and hot-dip galvanized steel? (February 23)
11628. White spots on Alumablack blackening camera open Q. (February 19)
01754. Blackening stainless steel: black oxide chemical dipping open Q. (January 4)


    2g. OTHER INORGANIC FINISHING: Mechanical Plating, QPQ, Metal Spray, Zinc-rich Dip-Spin Coatings, etc.

60730. Are bullets (projectiles) ever mechanically plated? open Q. (April 10) vip
08591. Sherardizing then zinc electroplating stainless steel nuts & washers open Q. (March 30)
27794. Want durable patina on sprayed zinc open Q. (March 8)


3. ORGANIC FINISHING PROCESSES . . .

    3a. ELECTROPAINT PRIMING, AUTOPHORETIC COATINGS

11694. Introduction to electrocoating open Q. (April 18)
32574. Small dots like popping in body c zone open Q. (April 11)
51966. How to increase E-coat throwing power? open Q. (April 11)
46897. How to increase CED DFT (linseed oil base) open Q. (February 25)

    3b. POWDER COATING

43619. Fisheyes when Powdercoating Aluminum but not Steel (April 20)
18298. Problems in powder coating open Q. (March 29)
26699. Industry specs for powder coating thickness and testing methods? open Q. (March 18)
45155. Powder coated stainless steel has rusted (March 14)
11023. Q&A's on Electrostatic Transfer Efficiency: Problems and Solutions open Q. (March 6)
34775. Yellow patches after powder coating open Q. (March 5)
32204. Powder coating problems on Aluminum open Q. (February 9)
52468. Pretreatment for Powder Coating - Extruded Aluminum (February 3)
36338. Yellow powder coating turning orange (January 27)
47137. Powder coated diecast parts fail drop test open Q. (January 20) brQ.
01152. Removing oil marks from powder coating open Q. (January 13)
58050. Powder coating finishes: textured, structured, plain (January 6)

    3c. LACQUERS, CLEAR COATS, ELECTROPHORETIC TINTING, ANTI-TARNISH

37471. Can't find electrophoretic lacquering services (April 7)
29961. Clear coating over bronze (December 26)

    3d. PAINTING, PRINTING, ADHESIVES AND OTHER ORGANIC COATINGS

10691. Painting of zinc plated parts (April 18)
16305. Prep & paint 316SST in the field open Q. (April 18)
42007. Can I paint a walk-in cooler? (April 12)
10157. What metal primer to use to increase adhesion of PVC & rubber? (March 29)
35373. Flexible spray chrome (March 28)
43386. Chrome on plastic: spray on chrome process open Q. (March 24)
38677. Does a good surface finish make it difficult for paint to adhere open Q. (March 18)
26015. How to test a surface to see if coating is PVDF open Q. (March 2)
30522. Clear coating to seal a rust patina finish on metal (February 18)
40989. Stoving Enamel is Too Matte open Q. (February 10)
60689. 'Metallizing' (for architectural) finishing service (February 9)
60674. Teflon coating on SUS304 Automotive parts open Q. (January 28)
03755. Clearcoat for silver jewelry open Q. (January 27)
24567. Paint peel off problems on hot & cold rolled steel open Q. (January 8)


4. POST-TREATMENTS

    4a. CHEMICAL POST-TREATMENTS
    [CHROMATE CONVERSION COATINGS, RUST PREVENTATIVES, PATINAS]

45598. Yellow chromate rubs off (April 19)
31467. Copper Wire Cleaning, Oxidation Prevention (March 14)
50709. Blue Zinc is turning yellow the next day open Q. (March 13)
12175. Seeking Touch Up Pen for Zinc Plating and Chromate open Q. (February 6)
04170. Tarnish resistant passivation of brass and copper (February 3)
28003. Protecting silver plated bus bar from tarnish (January 10)

    4b. BAKING AND NON-CHEMICAL POST-TREATMENTS:
    [HYDROGEN EMBRITTLEMENT AND DE-EMBRITTLEMENT, ANNEALING, WHISKERS, SOLDERING, REFLOWING]

44518. Tin plating turned brown from reflow (April 8)
47247. Ãcido de cobalto-cromo (Cr2CoO4) open Q. (March 23)
27766. Experimental method for quantifiable hydrogen embrittlement? (February 16)
43776. Silver Plated Copper Blisters when Brazed open Q. (February 12)
15043. Annealing of copper discolors it camera open Q. (January 17)

    4c. STRIPPING, REWORKS, ETC.

57202. Chemical to strip nickel plating (March 29)
20395. Rhodium plating Q&A, woes & problems open Q. (February 6)
57539. Stripping copper from steel takes too long and causes etching (January 10)
00792. Stripping of Nickel Plating from Neodymium magnets open Q. (January 7)


5. SUPPORTING ISSUES

    5a. ANALYSIS, LAB TECHNIQUE, Q.A., SALT SPRAY TESTING

00885. Analyze acid copper plating solution for chloride open Q. (April 19)
50132. Salt Spray Test -- ASTM B117 Operational Problems (April 18)
07192. R&R Study for Electroless Nickel Thickness (April 18)
51596. EDX: We dope, then don't find it all open Q. (April 15)
11434. Cyanide Copper plating Solution Analysis open Q. (April 9)
43467. Bath Analysis - Fluoride-Phosphate Conversion Coating open Q. (April 1)
55644. Etching Al 3104 without HF open Q. (March 28)
05183. How to prove our zinc plating was not passivated (March 23)
35573. Acceptance criteria after salt spray test open Q. (March 21)
60706. Wire plating: thickness test copper & tin open Q. (March 1) beRFQ: 09721. Need to buy or design/build salt spray chamber (February 17)
07041. Etching aluminum to reveal microstructure open Q. (February 11)
37665. Silver plating: analysis of silver open Q. (January 7)
12872. How to analyze Zinc Phosphate solution for iron and zinc open Q. (January 5)
01029. Recovering contaminated palladium chloride catalyzing bath open Q. (January 4)

     5b. WASTE & WASTEWATER TREATMENT, POLLUTION CONTROL

32443. pH of DM water is a mystery (April 18)
00016. Effluent from paint manufacturing is not clear after treatment (April 17)
24871. Rinsing and disposal of Alodine solution (April 4)
07245. Reducing COD in waste water open Q. (April 2)
12873. Silica removal from boiler water open Q. (March 29)
11853. What are the commercial non-ionic surfactants? (March 18)
48144. What is in chrome plating sludge? (March 17)
34502. DM / DI Water Plant regeneration: HCl vs. H2SO4 open Q. (March 17)
30932. Ion Exchange / DM plant calculations open Q. (March 8)
52466. What is Cation Conductivity (related to high pressure boiler) (March 4)
12215. High sulfates in wastewater after chrome treatment (February 23)
33620. Problems in Steam Generator water systems open Q. (February 23)
32633 Tube Settler vs. HRSCC open Q. (February 21)
60695. How to remove dissolved oxygen from borewell water open Q. (February 19)
45127. Best pH for zinc plating wastewater? Excessive zinc (February 14)
31013. Phosphating treatment and waste disposal? open Q. (January 22)
26974. TDS of rinsewater rises when we do acid pickling (January 13)
33695. Removal of Ammonia from Wastewater (January 13)
01558. Re-using pickling waste or recovering iron from it (January 4)

    5c. SAFETY ISSUES, EMISSIONS, TOXICITY, ENVIRONMENTAL IMPACTS

12778. Danger of copper sulphate (April 18)
15303. Is bronze flatware safe open Q. (April 18)
20858. Toxicity of stainless steel flatware (April 15)
45056. Galvanized steel for planting vegetables (April 12)
21703. Galvanized stove and metal fume fever open Q. (April 9)
16433. My husband is sick from welding galvanized steel (March 29)
20432. Hydrogen Sulfide from Dumpsters Is Tarnishing Silver? (March 29)
22551. Is there danger in cast aluminum cookware? open Q. (March 27)
28963. What could be causing the pitting and corroding to chrome fixtures open Q. (March 2)
34002. Must muriatic acid tank be exhausted? (February 23)
60682. What to replace chromium trioxide with in rust converter open Q. (February 2)
35556. Safety of nickel or chrome plated grilling surfaces open Q. (January 24)
10986. Swallowing Muriatic Acid (January 19)
32468. Allergic reaction to white gold (January 15)
48245. How toxic is chrome plating (January 12)

    5d. PLANT & PROCESS ENGINEERING, CONSTRUCTION

56947. Are Dual Rectifiers in a Single Box a Good Idea? open Q. (April 17)
60731. Materials of Construction for Nickel Acetate Seal open Q. (April 10)
17485. Tank Water Evaporation Estimates (April 10)
60725. Filter for Ag and Au Strike Baths (April 4)
60716. Design calculations and plant costing at micro level (March 20)
39965. How can I separate H2SO4 98% and HNO3 68%? open Q. (March 15)
50556. Protecting bus bar from corrosion in a plating shop (March 13)
21690. We want to build titanium plating racks (March 5)
09527. Starting a small plating business (February 23)
05142. Electric heaters for phosphate tank (February 21)
26187. What grade of stainless for caustic cleaner tank? (February 18)
50556. Copper Cables for DC low-voltage high-amperage open Q. (February 16)
02178. Improving energy efficiency in nickel electroplating (February 14)
21345. Dealing with rock hard Aluminum Etching Scale/Sludge camera open Q. (February 13)
19257. Rectifier Ripple and Electroplating open Q. (January 26)
39112. Something is weakening our polypropylene filter cloth open Q. (January 5)

    5e. QUESTIONS ABOUT SOFTWARE, SPECS, BOOKS, INDUSTRY STATISTICS, ETC.

26629. Need Honda spec MFZn.Ni1-B+TB3801 (March 8)
14434. ASTM B 488 question about gold strike (February 21)
00151. Chart to Convert Rz to Ra (February 3)
44460. Exposed HDPE - UV Protection vs. Food Safety Standardsopen Q. (February 1)
31203. Plain steel storage tank for fire protection open Q. (January 25)
20391. Details about automotive paint shop validation & verification methods open Q. (January 20)
44376. Boeing Finish Code Q&As open Q. (January 15)
57140. Is there a Standards-based method for analyzing nitric-dichromate passivation solution? open Q. (January 10)


    5f. WORLD WIDE WORD OF THE WEEK

60702. What is flash anodizing? (April 15)
60736. Need all details for PF ZN 8C plating open Q. (April 11)
29294. What does "premium quality" stainless mean? (April 10)
60710. Yellow metalgom coating (March 5)
14356. 316 SST vs. 316L SST (January 18)

    5g. REACH, RoHS, EOL Directive; Cd, Pb, Cr+6, Nitric Acid & Phosphate Replacements

24431. Is SPI B3 Finish RoHS & REACH Compatible? open Q. (April 13)
57850. Supplier says trivalent chromate but not RoHS compliant (April 9)
29054. Hexavalent blue chromate for 48 hours salt spray open Q. (January 25)

    5h. MOSTLY METALLURGY

12545. Oops! Carbon steel left in furnace overnight (April 6)
15926. Want Soft 18K Gold without Using Silver open Q. (March 29)
51470. Hardening EN8 / EN9 parts. Q&A's, Problems & Solutions open Q. (March 24)
37249. Can 51 HRC EN8 Material be straightened? open Q. (March 21)
50226. SS 202 for casserole pots? (March 14)
06927. Morse Taper machining in Copper open Q. (February 5)
13204. Annealing Stainless Steel types 303, 304, 316, 202 (February 3)
29589. Better material for stone crusher liner open Q. (February 2)
51406. Will ST-37-2 Steel Cooking Grates warp? open Q. (January 26)
60665. Is Chrome Steel tubing Resistant to 350 °C Hydrogen? open Q. (January 13)


6. CONSUMER, RESEARCH, & STUDENT ISSUES

    6a. ARTISTS, HOBBYISTS, CAR BUFFS, HOME OWNERS, ETC.

41066. Aluminum kitchen stuff no longer shiny -- How to fix it? (April 18)
38061. CLR stained my stainless steel sink camera (April 18)
47714. Expensive Chrome Wheels are "pitting" (April 17)
00937. Anodize titanium to gold color open Q. (April 16)
07164. Galvanized zinc for birdbath reservoir? open Q. (April 16)
02697. Electroblackening of Steel (April 16)
09549. What is black patina on old woodplane? open Q. (April 16)
26353. Cleaning gold that has been burned open Q. (April 15)
04913. Want to do Nickel Plating at Room Temperature (April 13)
34465. Pre-coating for sublimation transfers onto ceramic (April 13)
20443. Difference between pure silver and sterling silver (April 13)
35498. Painting outdoor aluminum furniture (April 11)
30700. How to tell if silver tray is lacquered open Q. (April 9)
08229. Baking Soda + Vinegar Etched My Bathtub (April 9)
49464. Cleaning up cement dust from sanding of concrete floor (April 9)
60729. Plating gun barrels with precious metals (April 9)
06773. Is my gold flatware real gold plating open Q. open Q. (April 8)
24229. Can I make concrete stains by dissolving metals in acid? open Q. (April 6)
00161. Clear coating brass, copper and silver jewelry (April 5)
07423. Paint not sticking to Ospho open Q. (April 5)
03338. How do I stop copper from oxidizing? (April 5)
16032. Cleaning/restoring vintage tin humpback trunk open Q. (April 5)
03003. Dissolving gold deposits for analysis (April 4)
12362. Coating tables and bar tops with thick clear pourable plastic camera (April 3)
16257. Painting galvanized sprinkler pipes (April 3)
22867. Why would yellow gold turn silver? (April 3)
02161. How can I tarnish or dull bright brass (April 2)
22541. Ceramic Coating vs. Powder Coating vs. Ceramic-powder Coating? open Q. (April 1)
00779. Remove patina from old ship's wheel camera open Q. (April 1)
08096. How to seal brass bed after it's restored? (March 30)
21724. Finish stripped off brushed stainless steel refrigerator open Q. (March 29)
23897. How do you identify if old lamp is brass or copper or bronze? (March 29)
06082. Difference Between Chrome and Nickel Plating camera (March 27)
29370. What does backwards c in a circle mean on jewelry (March 27)
25366. Inside of Cast Iron Tea Kettle is Rusting open Q. (March 22)
50888. Retouching metal furniture camera open Q. (March 22)
19519. Painting Fiberglass Tub/Shower Unit (March 22)
11385. Brass bed refinishing and cleaning (March 22)
13743. Maple Syrup Boiling / Evaporator Pans (March 21)
27662. Cleaning corroded pennies and coins (March 21)
44569. F.B. Rogers Silver item: 'The Log' camera open Q. (March 21)
21227. Sealing a Cast Iron Fireplace open Q. (March 21)
28610. How long should a rhodium plated black finish last? open Q. (March 21)
41124. Q&A's Replating of Silver Rings (March 21)
12453. DIY Anodizing problems (March 18)
15155. Darkening Process for Today's Pewter open Q. (March 18)
33611. Muriatic Acid for Fuel tank cleaning? open Q. (March 17)
35145. Brass is pink from improper cleaning (March 17)
23568. How long will brass lacquer last? (March 15)
52694. Leaving sterling silver unpolished open Q. (March 14)
46735. Did a magnet make my new fridge rust? open Q. (March 13)
48843. My 14kt yellow gold turned orange open Q. (March 13)
60712. Artistic electroplating of an engraved/recessed area (March 13)
53511. Separation of Gold metal from Gold Cyanide salt (March 7)
13432. Titanium Etch pre FPI (March 5)
41517. 14 kt Gold Plating is Too Dark open Q. (March 5)
17478. How to rust steel decoratively open Q. (March 5)
43254. How to Make Aluminum Corrode / Patina? (March 5)
41239. Recovery of gold from polishing dust, sweeps floor or dirty material open Q. (March 3)
19039. Cast Iron Cook Stoves: How to restore open Q. (March 2)
35232. Clear coat sealer for cast iron (March 2)
43464. Expensive new gold rings discolor my finger open Q. (March 2)
30693. Refining silver from smithing open Q. (February 26)
32894. Melt old gold onto existing charms (February 25)
13388. Galvanized roofing for bathroom walls open Q. (February 24)
18751. Looking to yellow gold plate my 14kt white gold ring (February 24)
01284. Home Anodizing 6262 Aluminum open Q. (February 24)
34446. Muriatic acid stains on stainless steel (February 24)
39781. Remove tarnish & stains but not patina camera open Q. (February 23)
09404. Ultrasonic cleaning discolored my rings (February 21)
22507. Stripping silver with electrolysis camera open Q. (February 20)
24004. Nickel vs. Chrome for kitchen & bathroom faucets (February 20)
26845. How to paint a stove top open Q. (February 19)
07290. What kind of pipe for tent heater (February 19)
38904. How To Intentionally Rust Metals Such As Jingle Bells & Safety Pins (February 18)
32971. Color Anodizing in Home Shop camera open Q. (February 18)
58136. Silver ring is now copper color (February 16)
04988. Can carbon-infused steel wok be seasoned? open Q. (February 13)
00946. Do-it-yourself Anodizing Questions (February 13)
19713. Chemically Produced Copper Patinas open Q. (February 12)
00779. Removing tarnish on brass, copper, bronze (February 11)
13044. Mercury damage to gold jewelry can be fixed with coconut oil (February 11)
15969. Metal Coloring Using Solvent Dyes open Q. (February 11)
25357. My anodizing is soft and mushy (February 10)
31343. Remove silver fixer from rubber/plastic dental racks open Q. (February 10)
10480. Refinishing Antique Metal Bed Frame open Q. (February 9)
33766. Strip copper-nickel-"gold" from zinc diecast (February 8)
59199. How to do two-tone gold plating open Q. (February 7)
00790. Can I leave copper counters un-lacquered? open Q. (February 7)
08204. Scratched and dull surface on stainless steel refrigerator door open Q. (February 7)
21630. Muriatic acid as a concrete cleaner and etch open Q. (February 7)
26684. Which cleaning products contain phosphoric acid open Q. (February 7)
33644. Zinc plating and chromating for rainbow colors open Q. (February 6)
24520. Anodizing of stainless steel (February 5)
33961. How to Darken Stainless Steel open Q. (February 5)
33616. Gold Recovery for Dummies (February 5)
27348. Do I use black copper for thermite, or green? (February 3)
36584. Rust on new stainless steel appliances (February 3)
54096. Gold plated bread warmer camera open Q. (February 1)
44567. Want rims part chrome plated, part powder coated (January 29)
17571. Refinishing shiny gold 1980's Kohler high-end faucets & drains camera open Q. (January 28)
11721. Source for Nickel free watch? (January 27)
23824. Can I turn a blued gun into a silver looking shiny gun? open Q. (January 27)
08743. What material will block magnetic force? camera open Q. (January 27)
00085. Problems and solutions for copper electroforming open Q. (January 27)
18519. Cleaning gold plated flatware (January 26)
22177. Brush finishing of brass cabinet pulls open Q. (January 26)
16429. Copper sealant to prevent oxidation and maintain appearance open Q. (January 26)
16430. How to paint brass lamps (January 26)
19866. Cleaning zinc clad tabletop? open Q. (January 26)
20967. Gold plating/electroforming of rice (January 26)
27488. Is there a difference in Peruvian silver and other silver (January 26)
24101. Can I use an air hopper to paint a wrought iron gate? open Q. (January 25)
49083. Kerosene Lamps. How to clean? (January 24)
33774. Gold plating onto silver surfaces (January 19)
60668. How to tell if surface was chrome plated or anodized camera (January 19)
28105. Copper plating a brazed joint camera (January 17)
01298. Nickel Plating Solution Recipe Needed open Q. (January 14)
10917. How to polish aluminum open Q. (January 14)
56593. Rust tunnels under paint (January 9)
60663. Layers of plating not fusing (January 9)
11428. Refinishing a Wood Stove open Q. (January 8)
36290. Will nickel plated stainless exhaust system peel? open Q. (January 7)
19652. Electroforming with non-cyanide Silver (January 6)
11172. Preparing acid copper brightener camera (January 4)
16699. Geneva Metal Kitchen Cabinets: Painting, Removing Dents, Replacement Handles open Q. (January 3)

    6b. RESEARCH, THESIS TOPICS, UNIVERSITY & POST-GRAD STUDENTS

07372. Plating Thickness vs. Current/Amperage -- What is the Relationship? (April 7)
00555. Plating copper onto aluminum open Q. (April 2)
31663. Silver plating on aluminum open Q. (March 28)
08007. What is maximum silver plating rate for my conditions? (March 18)
11260. What is ammonium bifluoride and when should it be used? (March 18)
17623. Zinc Stannate Process open Q. (March 17)
20929. Is the amount of metal electrodeposited proportional to plating time? (March 17)
23142. Good selective coatings for solar absorber open Q. (March 2)
28617. Manganese electroplating [Electrodeposition of Manganese] open Q. (March 2)
02236. Preparation/Extraction of Potassium Cyanide open Q. (February 23)
60696. Metal question for our Latin scholars open Q. (February 23)
08223. Electroplating or vapor deposition of aluminum onto carbon open Q. (February 19)
40943. Black zinc plating vs. Black oxiding. What's the difference? (February 16)
10337. Removing the white gold from a white gold ring (February 13)
04555. Treatment of Electroplating Waste -- Student Project (February 13)
60690. Trivalent Chrome Electrolyte testing in lab (February 10)
60669. Removal of oxide layer from nickel metal foam camera open Q. (January 19)
25645. Rotary Swaging, Rolling or Forming Anodized Al-alloy tube-end camera open Q. (January 19)
34579. Gold, Silver, Copper, Aluminum -- which is the better electrical conductor? open Q. (January 12)
52627. Aluminium from dissolving mandrel plates out on electroform open Q. (January 9)

    6c. K-12 SCIENCE PROJECTS, GRAMMAR & HIGH SCHOOL STUDENT QUESTIONS

11194. Magnesium ribbon and hydrochloric acid reaction (April 18)
33641. What is the affect of using different voltages in the electroplating process? (April 15)
26899. What metals rust the fastest (steel, copper, bronze) (March 22)
31790. Waste treatment for silver nitrate experiment? (March 14)
57496. Why can't we store electricity in water? (March 7)
33608. Does Coke dissolve coins? open Q. (March 2)
32654. Science project: Rust in saltwater vs. fresh (February 18)
39965. Want to make aqua regia from HCl and H2SO4 (February 18)
48959. More science projects about rusting steel wool open Q. (February 16)

7. DRIFTED OFF METAL FINISHING, BUT INTERESTING TO SOME OF US :-)

47120. Melting Aluminum Scrap: Too much aluminum oxide open Q. (April 13)
15559. Silver extraction from waste hypo/fixer solution open Q. (April 13)
60732. Repair of Steel Pool filter - 3.5" hole open Q. (April 10)
26801. Solving an electrolysis problem in home plumbing open Q. (April 10)
11438. How to Make Iron Non-magnetic (April 6)
19953. Cleaning chlorine generator piping open Q. (April 6)
22253. Refining of Platinum & Palladium open Q. (April 1)
10631. Removing adhesive & grout from old tiles to reuse them (March 29)
53795. Chemicals that mix with water for heat reaction (March 27)
33143. Reassemble Stiffel Lamp camera open Q. (March 26)
34676. Recovering sputtered gold from plastic? (March 24)
60717. Can red oxide under acidic conditions become a black oxide? open Q. (March 22)
19529. Refining of silver open Q. (March 21)
33365. Shafting and bronze bushing/bearing issues open Q. (March 17)
34532. Precipitating gold (March 14)
18029. Problems in White phenyl Manufacturing (March 12)
22201. Killing roots with copper sulphate (March 8)
60705. Self-curing cast polyurethane? (March 2)
14468. Volck oil emulsifiers? open Q. (February 28)
10153. Is a LULA lift a lift or an elevator? open Q. (February 19)
18886. Conch shell smells (February 13)
32107. Fixing a zipper frozen by salt spray (February 7)
23922. Musty smell in basement and throughout entire house (January 26)
14616. Black Phenyle Formulation Problems open Q. (January 26)
09868. What is voc lightning conductor? (January 22)
09128. Copper Sulphate as Swimming Pool Algae Remedy? (January 20)

legend:

(    )= Date in parentheses is most recent posting on the thread
open Q.= Thread currently ends with a question or the editor-curator's inconclusive musings
opinion!= Comments may raise blood pressure
silly :-)= For those with a sense of humor
video= Contains embedded video
camera= The inquiry has photos / graphics
pdf= Contains embedded pdf
vip= Inquirer often helps others, so especially deserves our help

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