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Categories
 Process: 0. Corrosion. Compatibility, Choosing a Finish
 Preparation: 1a. Mechanical Prep 1b. Chemical Pretreatments 1c. Masking & Racking
 Inorganic Finishing: 2a. Stainless Steel & Titanium Processing 2b. Anodizing & Light Metals 2c. Electroplating & Electroforming
2d. Electroless Plating 2e. PVD, CVD, Vacuum Processes 2f. Galvanizing, Hot Dipping
2g. Black Oxide, Bluing, Coloring 2h. 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 5i. Precious Metal Recovery
 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 . . .

01686. Hard Chrome Plating vs. Plasma, HVOF, Flame Spray (April 3)
18779. Roll material or coating for polyimide manufacturing open Q. (April 2)
07897. Galvanic issue with copper terminals on galvanized electrical boxes camera (April 1)
04019. Brass/Galvanizing Corrosion? open Q. (March 24)
55146. Nickel plated brass vs. 304SS for dilute sodium hypochlorite (March 7)
23142. Good selective coatings for solar absorber -- black chromium plating vs. Thurmalox/paints open Q. (February 28)
13026. Is it possible to coat silicon nitride with a graphite coating open Q. (February 9)
09142. What is Emissivity of Coatings? Alochrom, Black Plating (February 7)
20972. Designing a single plastic part suitable for painting, plating, PVD, or hydrography (February 1)
18759. How to fasten aluminum sculpture to marble base for exterior location (December 11)
61047. Protecting selective areas on precision machined weldments of Large Synoptic Survey Telescope open Q. (December 11)
41526. Comparing materials for solar water heater (December 9)
43834. Cadmium coated bolts / nuts for seawater exposure open Q. (December 6)
57437. Specification of Ceramic Coating on Bolts & Nuts (December 6)
60988. Need Hard, Inexpensive, Corrosion Resistant Stainless Steel open Q. (December 6) 2nd Request
13089. Any alternative to cadmium plating; if not, who can do it? (November 1)


1. PREPARATION . . .

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

05054. Videos of polishing stainless steel coil? open Q. (April 2)
05629. Vibratory polishing of stainless steel components (March 15)
43564. Polishing aluminum extrusions (February 12)
06053. Best but least expensive polishing of stainless screws (January 24)
09252. Want beadblast look on Titanium from tumbling or vibratory finishing (January 24)
26572. Can you tumble stainless to a high chrome mirror finish? (January 22)
52593. Safe Buffer RPMs for Polishing Aluminum open Q. (November 16)
61035. Polishing aluminum deposited on glass to 0.2 nm open Q. (November 16)
00151. Are higher Rz finishes rougher or smoother? (November 1)

    1b. PRETREATMENTS
    [CLEANING, PICKLING, ETCHING, PHOSPHATIZING, ACTIVATION]

34052. Black and White Spots after Mn Phosphating open Q. (March 24)
31884. Zinc vs. Manganese Phosphating (February 2)
30988. Corrosion resistance of zinc phosphate to ethylene glycol? open Q. (January 2)
07897. Iron phosphating a copper tube with aluminum fins (December 13)
53135. Components used in degreasing & derusting (December 6)
03537. Rainbow coloration on parts after electrocleaning (November 21)
12028. Is poor rinsing causing pickled steel to rust? open Q. (November 20)
41054. Etching TiW with hydrogen peroxide open Q. (November 16)
17279. Procedures for Pickling and passivation of carbon steel pipe (November 16)

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

05476. Masking material / method for electroless nickel plating (March 21)
33366. Masking areas during chrome plating process camera (December 9)
51314. Why do we need to mask ends of bore before plating? (December 6)


2. INORGANIC FINISHING PROCESSES . . .

    2a. STAINLESS STEEL & TITANIUM PROCESSING

12132. Passivating welded stainless steel open Q. (March 15)
32377. Titanium anodizing color uneven (February 21)
12570. When does nitric acid need replacement when Passivating SS 316L? (February 12)
50226. Where is type 202 Stainless Steel okay and not? open Q. (January 22)
53878. Want near-mirror polishing on SS 420 open Q. (January 17)
13628. Change to Surface of SS Etched with Nitric Acid increases adhesion open Q. (January 9)
02963. Non-uniform chrome finish on stainless steel parts camera open Q. (January 9)
50878. Can dry citric acid powder passivate stainless steel? (December 16)
46967. Reworking passivated stainless steel parts (December 5)
04564. Passivating 4340 steel (November 20)
61033. Size loss of up to .001" during passivation of stainless steel open Q. (November 9)
54187. pH and acid measurement in stainless steel pickling (November 8)
47017. Chemical to clean weld marks from stainless steel (November 1)

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

44807. Mixing stainless steel parts in anodize process? (April 5)
37711. White Streaks during anodizing of 6063 extruded Aluminium open Q. (March 26)
22496. De-smutting of clad aluminum leaves black residue open Q. (March 24)
42739. Cast aluminum turns black when chromate conversion coated open Q. (March 22)
57462. Anodizing watermarks (March 22)
00080. Black Anodize Issues: pitting, bleedout, purple haze camera (March 21)
43248. Bleed out problem with black anodize on a tin sulfate electro color process open Q. (March 21)
15288. Considering installing a bright dip & anodizing facility for small parts RFQ (March 18)
05030. Best anodizing method for small parts? open Q. (March 16)
04343. Coating small aluminum parts in bulk for seawater resistance open Q. (March 14)
02758. Color variations in machined aluminum castings (March 13)
61084. Laser cutting removes UV printing from anodized aluminum open Q. (March 11)
33933. Masking/stripping when chromate conversion and anodizing on same part (March 9)
61083. Where to buy 7175-T736 aluminum open Q. (March 6)
61082. Anodizing Dye Color Naming conventions? 4A, AEN, 3GL open Q. (March 6)
44778. Anodize defect or material (forged wheel) camera (March 4)
27314. Artist Anodizing of Aluminum (February 26)
13775. How to Chromate Conversion Coat ADC12 Aluminum (February 26)
30736. Aluminum Brite Dip Chemical Composition (February 24)
01177. Aluminum vs. Lead cathodes for anodizing tanks (February 20)
00524. Carbon/Soot buildup on chromic acid anodizing cathodes (February 20)
40421. Hard anodizing stopped offering enough wear resistance (February 15)
54202. Cleaning of chem-film conversion coating open Q. (February 13)
61075. How to reduce high zinc content in Socosurf open Q. (February 12)
19802. Sulfuric acid / peroxide process as a desmut/de-ox for aluminum? (February 6)
45931. Can Type IIB class 2 Anodize be touched up? (January 20)
00062. Type II B anodizing discolors with heat open Q. (January 19)
05333. Can Cast Aluminum be Anodized? camera open Q. (January 7)
27542. Anti-galling surface treatment for aluminium? (January 3)
55817. How to get chrome like finish on aluminium utensils? (December 27)
01419. "Neutralizing" sulphuric anodizing solution with bicarbonate (December 27)
14122. Re-anodizing Aluminum Printing Plates (December 17)
06930. How to make the etching solution for aluminium anodizing open Q. (December 12)
43963. Aluminum finish and Liquid Penetrant (NDT) Testing (December 11)
02994. What happens when Painted parts are put back into Alodine 1200s tank? (November 25)
10893. Shelf life of Alodine 871 pen open Q. (November 11)
55760. Green Dyed Aluminum Anodizing Rubs Off at 170 °C open Q. (November 8)
06559. What pH for Alodine 600? (November 4)
61025. Alkaline Anodizing of Aluminum open Q. (November 1)

    2c. ELECTROPLATING and ELECTROFORMING

61088. Nickel electroforming with very thin stainless steel foil as mandrel open Q. (April 4)
46145. Blistering issues plating over porous zinc die cast surface (April 4)
23629. Cost calculation for plating (April 3)
28851. Peeling Problems in Zinc-Nickel Plating open Q. (April 2)
50276. Plating Parameters calculations (April 2)
19033. Surface Prep for Chrome Plating (March 22)
33245. Trivalent Chrome Plating (March 21)
39337. Gold plating purity -- should lower karat cost less? (March 21)
37526. Want gold colored finishes without use of gold open Q. (March 21)
30879. Plating thickness variation in hard chrome plating (March 21)
55478. Touch-up of scratches in olive drab cad plate finish (March 21)
12211. Thread dimensions after plating (March 17)
19004. Discoloration of Chrome Plated Parts after Citric Passivation camera (March 15)
14813. Zinc-nickel plated parts are failing Kesternich testing (March 15)
27192. How to avoid defects occurring in electroplating (March 9)
44979. Nickel strike on carbon steel (March 9)
53041. NaCl or NiCl2 for nickel electroplating bath (March 9)
45698. Pits & defects in nickel plus hard chrome plating open Q. (March 5)
49988. Cadmium anodes turn black only while plating (March 2)
28863. Problems in cyanide copper plating (February 28)
46795. Light patches in black zinc plating (February 28)
27562. Thermally conductive and salt-water resistant finish (February 27)
30532. Durable chrome plating for a 2 stroke exhaust? (February 24)
14164. Iridium Coated Titanium Anodes: how to plate open Q. (February 20)
04497. How to Do Platinum Plating/Coating onto Titanium (February 20)
28003. Silver plating has milky finish that comes off when punching holes open Q. (February 20)
42108. Brown/yellow near hook when Rhodium plating (February 18)
38946. Zinc Plating of Iron camera open Q. (February 13)
00575. Hard chrome plating of brass-plus-aluminum guitar tuners camera (February 9)
61066. Risks of diluting an evaporated nickel plating solution? (February 6)
04001. Rusting On Iron parts after Nickel Plating (February 6)
03201. Internal anode for copper plating the I.D. of tubing (February 6)
61062. Need harder nickel free plating for zipper sliders (February 4)
47214. Cadmium plating black spots camera open Q. (February 4)
10415. What to use on gold plated surfaces to avoid fingerprints & grease? open Q. (January 30)
32077. Black spots in zinc plating open Q. (January 24)
51293. How to clean blind holes for acid zinc plating (January 23)
28127. Allowable current density / amps per square foot for zinc plating? (January 21)
41922. Nickel Plating defect: white patches (January 20)
01183. Hard Chrome Plating of Cast Iron camera open Q. (January 19)
35573. Nut with black zinc coating fails 96-hour salt spray test (January 18)
40095. White layer forms during acid zinc plating but not on Hull Cell panels camera open Q. (January 18)
35543. Porosity problems in hard chrome plating open Q. (January 18)
02412. Electrolytic gold plating is immersion depositing on non-electrified housing (January 17)
53207. Hard chrome plating inside the cylinder camera (January 16)
05424. What is the thickness of zinc plate from an acid based plating process? open Q. (January 9)
19274. Gold plating of aluminum open Q. (January 7)
55075. Hard chrome plating chip off at chamfer camera (January 6)
37336. Need chrome plating to survive 72-hours of SO2 corrosion testing open Q. (January 3)
55289. Porous cadmium plating specs needed open Q. (January 3)
49751. White Bronze Plating, an alternative to nickel (January 3)
54184. Re-chrome bronze castings open Q. (January 3)
31565. Plating onto Aluminum Bronze substrate (January 3)
01871. Hard Chrome Plating Pits camera open Q. (December 22)
35480. Zinc plating and rust (December 20)
22034. Nickel concentration rises in nickel plating tank (December 20)
13691. Want nodular/spiky silver plating (December 18)
00993. Metal balls sticking to each other in Sn plating open Q. (December 18)
30106. What does SC3 mean in ASTM B633? open Q. (December 16)
51925. Silver anodes are expensive; we want alternative (December 16)
26136. Need alternative to decorative chrome plating (December 11)
00907. Zinc plating of powdered metal parts (December 11)
01114. Parts sat in bronze plating solution for several days open Q. (December 11)
07070. Ni plating over Stainless steel for 96 Hrs SST resistance (December 11)
24316. Composition of makeup solution for bronze plating (December 9)
38877. Alkaline zinc plating problem (December 9)
61045. How to Calculate Current for Electroplating (December 2)
07124. Too many anodes in my Nickel electroplating tank? open Q. (November 26)
34750. Copper plating on magnesium (November 25)
14857. Nickel-chrome fireplace doors discolor camera (November 25)
37445. Black passivation has chalking, pitting, atmospheric corrosion? camera (November 22)
04221. Hex Chrome Plating Bath not maintaining temperature (November 11)
50375. How much rhodium is used in plating a pendant (November 11)

    2d. ELECTROLESS PLATING, PLATING ON PLASTICS, IMMERSION PLATING, CHROME-LOOK SPRAYS

18069. Plating on Plastics: ABS vs PC/ABS -- What substrate to use? open Q. (April 1)
32954. Peeling / poor adhesion of Electroless Nickel Plating on Steel Parts (March 5)
15914. Spotty speckles on PC+ABS chromed parts (February 11)
59181. Plating 3D printed Steel (60% stainless + 40% Bronze) (February 11)
28217. Electroless nickel on aluminum - high temp (February 8)
20973. Copper contamination of Immersion Gold bath open Q. (January 7)
25101. How does Electroless Plating work? (January 3)
60099. "Spray-On" Copper Plating open Q. (December 15)
02153. Immersion Tin Plating on Aluminum open Q. (November 26)
45052. Electroless vs. immersion vs. displacement vs. contact plating (November 20)

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

60771. High Temperature PVD Coatings for Gas Burners & Firepits (March 27)
56405. Problem with stainless bolts in plasma chamber open Q. (March 13)
35675. Color problem with PVD Titanium Nitride coating: bright pink camera open Q. (February 24)
61071. Metalized parts turn 'gold' even before topcoat open Q. (February 11)
61057. PECVD anti-finger print coating on PVD pieces open Q. (January 8)
45276. Marks on PVD coating camera (January 3)
14081. Cleaning ceramics before PVD coating open Q. (January 2)
13115. 24 karat gold color PVD TiN? open Q. (December 10)
57133. PVD vs. e-coating for gold color (November 1)

    2f. GALVANIZING, ALUMINIZING, HOT TIN DIPPING

57418 Galvanic compatibility HDG and Galfan open Q. (April 5)
38207. Want flower [spangle?] in hot dip galvanizing (March 21)
46006. Rough and lumpy finish on galvanized parts camera (March 9)
60905. Galvanizing Flux cleaning (March 7)
43365. Hot dip galvanizing flux Q & A's, Problems and Solutions open Q. (February 12)
58479. Wiping pad questions for wire galvanising? open Q. (February 4)
16257. Painting galvanized pipe (January 24)
33979. Does hot dip galvanizing work for stainless steel? (January 20)
40753A Starting-up a Galvanizing Kettle with Zinc Ingots (January 11)
61054. Stains from post-treating galvanizing with tannic acid camera (January 8)
00009. Black Stains & White Rust on Hot Dip Galvanized Zinc Coating (January 7)
61050. Prepare the steel before galvanizing (January 7)
41571. Reduce ash generation in galvanizing (December 18)
29835. Visual appearance of hot dip galvanizing vs. zinc electroplating (December 11)
48000. Soft ash deposits on galvanized steel open Q. (December 6)
42842. Rusted hot dip galvanized bolt and nuts camera (November 12)
57322. Thick Galvanized Coatings, How to Get, What is Maximum? (November 11)
56867. Stains on galvanized expanded metal fencing camera (November 9)

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

61087. Black Oxide with Supplemental Coating open Q. 2nd Request (April 3)
11740. Black oxide formula for Hot Blueing of Guns/Firearms open Q. (March 14)
01754. Black oxide on 329 SS not taking (January 15)
13097. Basket contact marks in black oxiding (December 27)


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

49676. How to calculate/measure the thickness of zinc coating (March 14)
61055. Sintered Iron Part - Gas Nitriding Unsuccessful (January 16)


3. ORGANIC FINISHING PROCESSES . . .

    3a. ELECTROPAINT PRIMING, AUTOPHORETIC COATINGS

32574. CED e-coating bubbles/holes? Defect problem on chrome plated surface camera open Q. (March 21)
11694. E-coating solvent: butyl glycol? open Q. (March 4)
39698. CED Paint conductivity is dropping/climbing open Q. (February 24)
23620. Is E-coating or powder coating more capital intensive? (January 6)

    3b. POWDER COATING

47439. Issues Powder Coating Galvanized Steel (April 3)
25190. Will powder coating prevent galvanic corrosion? (March 21)
55323. Cissing problem in powder coating open Q. (March 13)
03180. Powdercoat Blistering on Zinc plus Chromate (January 10)
36503. Thickness standard for powder coated aluminum open Q. (January 3)
26699. Need 5 mil thick powder coating (December 11)
15733. Time between pretreat and powder coating (December 3)
14221. Activating a metal surface for powder coating open Q. (November 6)

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

61085. Need e-coating of our skateboard tools camera RFQ open Q. (March 15)
51966. Metals in CED Solvent open Q. (March 3) 2nd Request
28527. Vacuum metalizing basecoat (December 2)
61041. Finishing porous brass casting before lacquering open Q. (November 18)

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

13023. Plastisol as a finish for steel roof and facade panels open Q. (January 27)
25091. Need highly reflective or glow paint to handle 300 °F temperature (January 22)
43155. Failure in CASS testing of Wet acrylic paint on aluminium rims open Q. (January 8)
61049. Best leveling agent for anti-corrosion water-based coating? open Q. (December 14)
33380. Ionization systems for paint booth air open Q. (December 9)
60877. Does Wash Primer have Hexavalent Chrome? (December 5)


4. POST-TREATMENTS

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

18314. Electrolytic chromating of Silver (March 4)

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

54023. Zinc plated & chromated parts are 'frosted' after baking camera (March 21)
59335. Hydrogen embrittlement test (ASTM F519) failures on notch test bars (February 23)
01216. Hydrogen embrittlement despite baking (February 9)
01747. Chrome plating and Hydrogen Embrittlement Relief open Q. (November 26)

    4c. STRIPPING, REWORKS, ETC.

24769. Arc detection unit for electro chemical stripping open Q. (March 5)
61076. Strip aluminium from steel dies without caustic solution camera open Q. (February 20)
44254. How to strip 60/40 tin lead (January 23)
34973. Remove Residual Nickel Plating after Blasting (January 22)


5. SUPPORTING ISSUES

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

17894. Sodium Hydroxide: How to make to 0.5 M strength (April 1)
15345. Titration vs Spectroscopy measurement for HF-nitric-Ti solution open Q. (February 13)
23303. XRF Testing for Nickel plating adhesion? open Q. (February 13)
23826. Electroless Nickel XRF App calibration open Q. (February 13)
03695. Razor blades as plating thickness measurement coupons? open Q. (February 6)
61046. Labs say there is no chrome on our 'chrome plated' parts (February 6)
44450. Determination of percent Oil in soak/electro-cleaner (January 7)
02550. Salt spray test chamber spare parts, calibration, & service open Q. (January 6)
23834. Nital Etch Issues: Amount of Material Removal (December 19)
20345. How to compare ASTM B117 Salt Spray and ASTM B368 CASS Test? (December 18)
20174. Gravimetric analysis of sulfates in Alodine 600 open Q. (November 21)
41155. How to analyze for NaCl in a Boric Sulfuric anodizing tank? (November 15)
41654. Determine % Nitric Acid. Titration? Conversion factor? (November 15)

     5b. WASTE & WASTEWATER TREATMENT, POLLUTION CONTROL

13753. Treating plating wastewater then re-using it (March 27)
04630. Demineralization (Water Treatment) Problems open Q. (March 17)
41896. Continuously recycling high calcium sulphate effluent open Q. (March 5)
26453. Recycling of off spec hard chrome plating bath (February 12)
61070. Mixing Nickel strike with Copper sulfate bath for disposal open Q. (February 11)
04924. Electrocoagulation for wastewater treatment? (January 9)
46503. Electronic descalers for removal of silica? open Q. (December 6)
58940. De-ionizer life is cut in half open Q. (November 18)

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

61086. Coronavirus copper plate door handles open Q. (March 27)
07164. Is galvanised steel poisonous? (March 12)
00295. Is HCN gas released from an acid gold bath? (February 28)
61053. Lead poisoning from machining steel & stainless steel? open Q. (January 7)
11007. Danger of olive drab chromate? (January 1)
45592. Is Rustoleum safe for cookie cutters? (December 6)
47195. Hexavalent chromium in coffee grinder (December 6)
21863. Can gas logs be used in lead painted fireplace? open Q. (November 16)

    5d. PLANT & PROCESS ENGINEERING, CONSTRUCTION

06364. Plating barrel danglers and other maintenance problems open Q. (March 18)
44455. Will a filter press successfully remove phosphate sludge? (March 11)
05142. Materials of construction for zinc phosphating tank (February 28)
09527. Purchasing an existing chrome plating shop (February 8)
56563. Coating Plating Racks with insulating stop-off? (January 30)
38265. Aluminum joint star point in NGR panel is overheating open Q. (January 28)
50556. Copper Bus Bar Sizing for DC low-voltage high-amperage (January 22)
06109. Alternatives for attaching to the fly bar for huge (heavy) parts open Q. (January 2)
61009. Ventilation requirement for Manganese Phosphate line (December 16)
00897. Clipping (Racking) Mechanism for Electropolishing Nitinol Medical Devices (December 11)
16284. Efficiency & ripple of electroplating rectifiers open Q. (November 27)
48519. Best heating/cooling coil material for acid zinc (November 12)

    5e. QUESTIONS ABOUT SOFTWARE, SPECS, BOOKS, EDUCATION, INDUSTRY STATS, ETC.

46957. Standards for Life expectancy of zinc plating & powder coating open Q. (February 27)
61077. M.S. recommendation: Material science or Material engineering open Q. (February 25)
32813. What is MIL-STD-171 finish 4.1 (February 13)
08473. Spec for Grinding of chrome plated steel open Q. (February 6)
18276. Replacement for MIL-STD-1878 (January 28)
61043. Body-In-White spec: cleanliness before degreasing open Q. (November 23)
25220. Should I specify zinc plating per ISO 2081 or per ISO 14713? (November 4)


    5f. WWWord OF THE WEEK

61014. Nickel striked or struck? silly :-) (February 20)
61048. What is "IMMUNIZE" finish? (December 12)
57491. Where can I source for material SGCC? open Q. (November 8)

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

40069. Screen printing on zinc plated and chromated surface peeling off open Q. (March 6)
41276. Want glossy full black trivalent chromate for zinc plating (October 14)

    5h. MOSTLY METALLURGY; Heat Treatment

32665. Heating zinc plated hook screws in order to bend the hooks (April 3)
51470. Blacksmith's EN9 hammers aren't hardening right open Q. (March 15)
19723. 904L steel vs. 316L in watchmaking industry (March 3)
46092. Top layer peels off Phosphor Bronze in stamping process camera open Q. (January 24)
51470. Hardening EN8 / EN9 parts. Q&A's, Problems & Solutions open Q. (January 19)
30998. Making a solid rhodium ring camera (January 17)
15043. Problems in Annealing of Copper Wire (January 3)

    5i. PRECIOUS METAL RECOVERY

20033. Recovery of fine floating gold open Q. (March 15)
33616. Recovering Gold and Palladium from test strips (March 15)
26353. Cleaning gold that has been burned (February 24)
32894. Melt old gold to make new jewelry (February 24)
53511. Precipitating gold from a cyanide solution (February 15)
37685. Washing PGM salts before refining (February 4)
07382. Extracting Silver From Photographic Fixer open Q. (January 21)
19529. Refining of silver chloride to silver metal open Q. (January 9)


6. CONSUMER, RESEARCH, & STUDENT ISSUES

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

22174. Looking for Green Engraver, or parts and manuals, Model D2 or 106 camera (April 5)
26881. Chemicals for nickel plating hard to find camera open Q. (April 5)
56181. Lacquering or clearcoating of Anodising open Q. (April 5)
35145. My Brass is Pink not Yellow (April 5)
57992. Polishing Copper Plating on Plastic open Q. (April 4)
00779. Clean up corrosion/patina on old Spanish chandeliers camera open Q. (April 4)
04913. DIY Nickel plating onto steel (April 3)
38809. The wheels come off the buggy (April 3)
12601. Need Teflon Spray Can for Home Cooking Pans/Pots (March 27)
28857. Bonding galvanized sheet metal to itself open Q. (March 24)
44444. Fire chrome/plasma chrome/flame chrome (March 24)
07137. Dirilyte gold-tone flatware: Cleaning / Polishing open Q. (March 22)
16808. Remove paint from 15th-century bronze Buddha camera open Q. (March 16)
07352. How to coat objects for iridescence (March 14)
06773. Gold plating on sterling flatware disappeared in storage (March 14)
31886. Finishing secrets for Parawood tables, chairs & furniture open Q. (March 12)
11826. Cause of black mark on skin from gold jewelry (March 12)
49696. Protect Steel Countertop from Corrosion (March 9)
15987. Change the color of solder to copper color (March 7)
25588. Knoll Platner table: cleaning of nickel plated steel open Q. (March 3)
26994. What is the proportions of HCl and the other chemical? open Q. (March 3)
40345. Chrome peeling / curb rash camera (February 29)
32106. Using HCl (hydrochloric acid) to remove rust open Q. (February 29)
61081. Vulcanizing Rubber (CR) binding to steel for 1939 Buick part camera open Q. (February 29)
52237. Color Dying Ink-Washed Zinc Figurines camera open Q. (February 28)
34465. Pre-coating for sublimation transfers onto ceramic (February 27)
29192. Tin Electroplating the Inside of Copper Vessels camera (February 27)
06245. Rose Gold Plating a Saxophone (February 27)
27814. How to Recover Platinum from Catalytic Converters open Q. (February 27)
61080. Resurfacing existing wood paneled walk-in refrigerator open Q. (February 27)
07846. TiAl targets for purple PVD coating open Q. (February 27)
17478. How to rust steel on purpose (February 26)
28963. What could be causing the pitting and corroding to chrome fixtures (February 23)
06028. Tin Ceiling Restoration Help Please (February 22)
02076. Remove/strip anodizing from aluminum (February 22)
10337. Recycling rhodium plated brass earrings open Q. (February 21)
44569. F.B. Rogers Tea Set -- Is It Silver Plate or Sterling Silver? open Q. (February 20)
45366. Resurface and polish High Manganese Steel camera (February 20)
04785. Cleaning/Polishing Silver with Aluminum Foil and Washing Soda (February 14)
24076. Is Heat-Colored 304SS more or less subject to corrosion? vip open Q. (February 14)
15155. Creating a patina on pewter open Q. (February 13)
41066. Boiling aluminum for 24 hours for corrosion protection (February 13)
13393. Preparing sea shells for crafts or display open Q. (February 9)
21527. Does the air in my new apartment tarnish silver? (February 8)
17968. Refinishing Oil Rubbed Bronze open Q. (February 6)
10145. Remove oxidation from aluminum siding and clearcoat it? open Q. (February 4)
20858. Toxicity of nickel silver flatware open Q. (February 2)
08881. Want to powdercoat Corvette wheels but save Chrome center hubs open Q. (February 1)
11151. Moonshine Aluminum Polish (very strong) camera (January 30)
31344. How do you tell the difference between gold and brass (January 30)
28963. Corrosion all through my house open Q. (January 30)
26616. Finding equivalent to mirror effect paint as this is not available (January 24)
32129. Cleaning copper and leaving no residue (January 22)
01198. How to antique brass plating (January 19)
58258. How to nano coat silver coins open Q. (January 19)
14075. How to etch silver open Q. (January 19)
11608. Is zinc plating of copper, then heating for brass look a practical technique? open Q. (January 8)
43774. Damaged sterling silver from using Tarnex polish (January 7)
18650. Blackening process for Persian tray? (January 7)
18847. Amateur D-I-Y Copper Plating at Home open Q. (January 7)
19039. Cast Iron Cook Stoves: Where to find parts and how to restore (January 7)
30442. What paint do I use on a metal mailbox? (January 7)
33758. Gold ring turns my finger green & black (January 3)
07423. Paint not sticking to Ospho (January 3)
25636. Is 1/20 14K gold filled good or cheap jewelry? open Q. (January 3)
07167. How to dry copper without it oxidizing? open Q. (December 27)
02242. How to do Selective Gold Plating on Jewelry (December 27)
06873. Variant on japanning called Crystal Japan camera (December 19)
01685. Is it possible to change the dye color of an already anodized part? (December 19)
42251. Which coating is best for aluminium, anodizing vs. chromating (December 19)
25718. Copper pipe in basement is turning black open Q. (December 19)
34271. Trying to identify old plating on Model A Ford camera open Q. (December 18)
54096. Is my old ceramic lamp gold plated or not? (December 15)
29394. Spot tests for plating type identification (December 11)
34618. New dishwasher detergent discolors silver open Q. (December 11)
38112. Restoring Nickel Plating on Cast Iron (December 9)
38969. Electroplating Aluminum onto Graphite (December 6)
53013. How much area will 4 grams of gold cover? (December 6)
48396. How to increase dendrites and branching in copper plating?open Q. (December 5)
57748. Can copper be plated onto zinc diecast? open Q. (November 25)
29370. What does 14K A & P mean on jewelry? camera open Q. (November 17)
61040. How can I improve my DIY black oxide coating process? camera open Q. (November 16)
39354. Heat colouring of titanium open Q. (November 16)
55324. Gold plating on brass chalice quickly tarnished open Q. (November 16)
24718. Preventing electro galvanic reaction between aluminum and steel open Q. (November 15)
28810. Consumer silver plating solutions (November 13)
13189. Want Non-Conductive Metal Watch Case open Q. (November 1)
19006. Black powder finishing on rim of Stainless steel food canisters open Q. (November 1)

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

16897. Electroless Nickel, copper and silver on stainless steel (March 23)
39965. Digestion of mineral-organic mixture (March 12)
38317. What grades of aluminum work best for Hardcoat Anodizing? open Q. (February 25)
22644. Increasing plating speed with agitation, or higher temperature open Q. (February 24)
61034. Aluminium Anodizing followed by reverse-anodizing (December 5)
27089. Electrodeposition of Tungsten? open Q. (November 12)

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

18683. Rusting Nails: student experiment & research (February 29)
27348. Tarnish on pennies: Is it rust, copper oxide, or copper sulfide (February 24)
32807. Nails rusting science project (January 15)
28434. Electroplating copper onto nickel for science project (January 6)
33606. Science project: plating copper onto steel (December 9)
43647. How to measure corrosion for science project (November 21)

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

12373. Zinc oxide production by French process open Q. (March 20)
33143. Stiffel lamps need repair camera (February 24)
08792. Where's my Allied-Kelite pension? (February 8)
53795. Want a chemical that heats up (February 5)
10153. Sedgwick Residential Elevators Parts and Maintenance open Q. (January 27)
15053. Boric acid -- safe for humans? (January 24)
04902. Reflection from windows is melting plastic siding open Q. (January 6)
26176. Rubber top for old tanker desks? open Q. (December 18)
30479. Copper corrosion and blue water in residential water system open Q. (December 14)
61036. Unexpected color change in acid solution for soil digestion (November 21)
37106. Cleaning roof mold/moss with bleach (November 16)
13743. Maple Syrup Boiling / Evaporator Pans: use Mild Steel or Galvanized or What? (November 15)

legend:

(    )= Date in parentheses is most recent posting on the thread
open Q.= Thread currently ends with a question, or the response leaves it partially unanswered
RFQ= This posting is a combination technical question and RFQ
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
spanish= Thread is partially in Spanish

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