Updated Tuesday, August 20 at 11:30 P.M. New York City time.

New category 2a added for Stainless Steel & Titanium Processing Questions

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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 . . .

34692. Need brass jewelry to last 3 months open Q. (August 20)
01686. Hard Chrome Plating vs. Plasma, HVOF, Flame Spray (August 20)
57437. Specification of Ceramic Coating on Bolts & Nuts open Q. (August 17)
58242. Want cheap alternative to galvanized sheet but with equivalent properties (August 8)
41930. Galvanic Corrosion between Galvanized Steel and Aluminum (July 23)
27167. Insulating tape between stainless and aluminum? (July 9)
19766. Galvanic Action between Galvanized and Stainless Steel? (July 2)
13089. Galvanic compatibility: electroless nickel and olive drab cadmium? open Q. (June 18)
16063. Coatings for screws and nuts in garden boxes (May 30)
43283. Electrodes best suited to split water (May 23)
60956. Torque Increment process in Bronze C-95500 hot line clamp camera (May 18)
40943. Black zinc plating vs. Black oxiding. What's the difference? (April 15)
50328. What coating is on this 416SS which is 50µm thick with hardness of 35-40 HRC? open Q. (April 15)
42140. Correct usage of 4 metals in electrical circuit open Q. (April 8)
01744. How long will stainless steel last in salt spray test? (April 8)
31153. Stainless screws okay on aluminum machinery? (March 25)
22402. Alternative spring coatings instead of "flock" (March 18)
35528. Hot dip cadmium coating? (March 18)


1. PREPARATION . . .

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

20634. Grit Size and Related Surface Roughness Values open Q. (August 16)
45348. Zinc die casting parts black spot after shot blasting open Q. (August 16)
26572. Can you tumble stainless to a high chrome mirror finish? (August 15)
32581. 3-in-1 chemical to Pretreat for Powder Coating (July 19)
06753. Converting Ra to Rz1max camera (July 18)
00897. Electropolishing nitinol open Q. (June 4)
07560. Least expensive way to get N8 or N6 finish on graphite? (May 24)
12526. Interviewer says SA2.5 measures surface roughness not cleanliness open Q. (April 17)
21712. Deburring of Aluminum components (April 16)
05396. Is this surface smooth enough? (April 7)

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

53135. Iron phosphate vs. zinc phosphate spanish(August 20)
34052. Manganese phosphate coating on steel: issues and answers open Q. (August 16)
37180. De-rusting/De-scaling of Heat Treated Parts (August 10)
03480. Poor salt spray test for hydrogen-embrittlement baked phosphating (August 9)
10242. Zinc phosphated surface problems (July 30)
34839. Zinc phosphating for 72 Hour salt spray (July 2)
20616. Problem with Electrocleaning of Brass (June 27)
29208. Citric acid for cleaning phosphate buildup from spray tips, etc. open Q. (June 18)
51678. Rust in Cast Iron parts with internal cavities after Mn Phosphate & Waxing (June 15)
13235. Steel Pickling Line does unwanted Copper Plating open Q. (June 8)
56364. Maintaining acid levels in Nitric-hydrofluoric pickling process open Q. (April 6)

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

09494. Problems masking for anodizing plus electroless nickel (August 9)
04589. How to prevent anodizing on inside of hollow sections (July 11)
33366. Masking areas during chrome plating process camera (July 9)
60909. Can hard chrome plating survive 7-stage phosphatizing? open Q. (December 31)
58316. Liquid masking for anodizing (December 12)


2. INORGANIC FINISHING PROCESSES . . .

    2a. STAINLESS STEEL & TITANIUM PROCESSING

50746. ASTM A967 vs. AMS 2700 open Q. (August 20)
24520. Will Anodizing of Stainless Steel Change Emissivity? open Q. (August 15)
05000. Barrel/Tray Electropolishing Help Please open Q. (August 2)
50566. Titanium chemistry in HF and HNO3 chemical milling open Q. (July 23)
57523. Rinsing after Passivation (July 19)
42531. Removing Oxidation from Kovar open Q. (June 28)
56202. 440C stainless turned black when passivated (June 28)
11047. How to know when to dump/decant electropolishing bath open Q. (June 28)
05422. Stains on electropolished surfaces camera open Q. (June 25)
10882. Chemical and electrochemical etching of stainless steel open Q. (May 28)
58455. Electropolishing Series 4xx stainless steel open Q. (May 26)
08147. Finishing titanium medical implants (May 9)
39913. Selective / Touch-up Passivation of Stainless Steel (May 9)
06885. Problems & Solutions in Passivation of Titanium (May 9)
24076. Heat coloring Stainless: Durability of the finish outside (May 3)
06053. Want shiny finish on stainless steel bolts/screws (April 28)
42333. Mirror Electropolishing of 2205 Duplex Stainless (April 17)
47017. Chemical to clean weld marks from stainless steel (April 11)
42723. Passivating stainless steel tanks (April 11)
07926. Two-tone titanium anodizing problems (April 9)
53648. Brush on Electropolishing open Q. (April 4)
22121. Cleaning, pickling, etching of Ti-6Al-4V titanium Q&A open Q. (March 1)

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

45313. HF/HNO# Desmut for Aluminum - Control Measures? open Q. (August 20)
29662. Roughness in acid copper plating (August 18)
56581. Rainbow effect / defect on anodized aluminum? open Q. (August 17)
04558. Why do I need chromate pretreatment before painting aluminum? (August 15)
27674. Cylinder bore / I.D. hard anodizing questions open Q. (August 13)
60879. Mill spots and discoloration in 6063 dark anodize (August 13)
33735. Aluminum parts are pitting in DI water (August 11)
19342. Is default color of chromate conversion coating gold? (July 30)
26894. Problems in cold sealing of anodized aluminum profiles (July 27)
60967. Anodizing color variations in a single profile camera (July 24) vip
13823. Finishing Aluminum Castings: burrs / flash / lamination issues camera open Q. (July 19)
60828. Aluminum cathodes for anodizing (July 7)
44433. MIL-DTL-5541 coating can be white, yellow, brown, or blue (June 28)
60966. Lifetime of Chemicals in Aluminum Anodizing (June 21)
43432. Anodizing On Cast Aluminum (ADC 12 grade) open Q. (June 19)
04422. Aluminum Anodizing Color Match Problems camera (June 12)
10820. Anodized 6061 aluminum fails salt spray test open Q. (June 8)
01819. Q&As on Teflon (PTFE) impregnated Hard Anodizing of Aluminum (June 2)
60958. Over-etched anodized parts and a ton of other problems (May 9)
01353. What is the proprietary additive for room-temperature hard anodizing? open Q. (April 28)
14352. Aluminum Frame anodizing - how to prevent white spot at the frame joining camera open Q. (April 24)
11225. "Dishwasher Safe?" Anodized Aluminum (April 22)
07428. Fading hardcoat anodize camera open Q. (April 18)
15922. Sealing Hard Anodic Coatings (April 17)
31663. Plated aluminum for projection welding fixtures open Q. (April 16)
42711. Etching, deoxidizing, anodizing, sealing problems with type 2219 aluminum alloy open Q. (April 9)
46468. Problems in anodizing 7xxx aluminum open Q. (April 9)
22258. Increasing aluminum in chromic acid anodizing bath open Q. (April 4)
42837. Aluminium vs. titanium anodizing racks open Q. (April 2)
05691. White Spots when Anodizing 6061 Aluminum and Dyeing It Blue open Q. (April 1)
06701. How to calculate anodizing time for different load sizes (March 30)
02530. Start the stopwatch when we begin immersing the load or when it's all the way in? open Q. (March 30)
56917. Problems with Alodine not sticking camera (March 9)
44929. High temperature color anodizing (March 9)
45421. Black spots/streaks in anodized aluminium (March 7)
05112. Pitting of 2024 Aluminum with Standard or Ematal Anodizing camera (March 2)
06733. Bright dip aluminum at room temperature (March 2)
54534. Hard Anodize Problem on AL2024 (March 2)

    2c. ELECTROPLATING and ELECTROFORMING

17234. Is this part suitable for Zinc-Nickel plating? camera open Q. (August 20)
31163. Zinc analysis in brass bath open Q. (August 20)
10051. Brass plating is too pink open Q. (August 20)
35480. Zinc Nickel Plated Parts Have Red Rust on top of the plating open Q. (August 11)
03946. Silver Plating is Yellow (August 9)
30106. Zinc plating thickness vs. salt spray resistance (August 3)
35342. White patches in Chrome Plating camera open Q. (July 29)
29024. Solder Plates onto Mold Compound Resin camera open Q. (July 30) 2nd Request
43712. Does nickel strike cause more hydrogen embrittlement than nickel plating? open Q. (July 29)
28863. My copper cyanide bath is not catching plating (July 26)
57748. Can copper be plated onto nickel? (July 26)
37073. White stains on tin plating camera open Q. (July 21)
56121. White spots during nickel plating open Q. (July 21)
27356. Activation Bath before Cyanide Silver Plating Causes Rough Deposit open Q. (July 9)
36390. Hard chrome plating isn't hard enough (July 9)
24716. Nickel plating zinc die castings (July 4)
48966. Freezing out carbonates in alkaline zinc plating bath camera open Q. (July 4)
30106. Zinc plating thickness vs. corrosion resistance (July 3)
39274. Relationship between darkness & pH in fluoboric tin plating (July 2)
36668. Best plating for copper mould plates for continuous casting (June 23)
45418. Chrome plating bubbles and peels off Z3 diecastings (June 23)
12798. Rhodium plating on yellow gold (June 22)
18854. Carbonate problems in Copper Cyanide Plating open Q. (June 18)
22409. Safe plating thickness to not cause thread binding of #6 screw? (June 17)
29140. Additive for zinc plating to allow high temperatures without dullness open Q. (June 17)
36730. White stains in nickel plating camera (June 15)
47214. Black spots in cadmium plating (June 15)
47424. Blisters when Copper plating zinc diecast (Zamak) (June 15)
56140. Chloride contamination of chrome plating solution -- Analysis and Removal (June 15)
45031. Can Alodine work over Tin-Lead Plating? open Q. (June 6)
18940. Hardness & conductivity of different types of nickel plating open Q. (June 5)
12412. Silver plating bath brighteners (June 2)
36290. Blisters in Wood's Nickel, Bright Nickel, Gold Plating (June 2)
30419. Rhodium plating is dark and discolored (May 28)
12243. Cracks in tin plated surface (May 24)
47037. Chromate conversion on cadmium plating problems camera (May 24)
46708. Rhodium plating has a white rash (May 24)
06338. Rhodium brighteners after carbon filtration camera (May 24)
41922. Nickel Plating defect: white patches open Q. (May 23)
34092. Problem with potassium chloride/ammonium chloride acid zinc plating open Q. (May 16) vip
10210. Fine white grit on nickel plating. Excessive boric acid? camera (May 13)
11395. Plating tin on phos bronze (May 11)
09527. Buying a small plating business (May 7)
47970. Is our copper plating too hard? (May 5)
28003. Silver Plating of Switchgear Bus Bar turns black (May 3)
28032. Electroplating with Brass (Electrodeposition of Brass) open Q. (May 2)
55324. Barrier Layer to Prevent Tarnish on Gold Plated Silver (April 28)
60957. Can cad plating be applied over chrome? (April 26)
50905. Cyanide or sulfite gold plating better for my application? open Q. (April 26)
47340. Brightener consumption in nickel plating (April 26)
47484. Chrome plating ID of stainless tube (April 20)
04146. Electroformed gold is brittle (April 18)
15218. Is a nickel D crown anode the same thing as a nickel S round (April 17)
34821. Want gold flash plating layer 0.005 microns thick (April 14)
38265. Why must Copper Bus Bar be Tin Plated? (April 11)
38877. "Wire marks" when we wire tractor pins for non-cyanide zinc plating (April 9)
33774. Plating white bronze onto sterling silver (April 5)
07077. Black nickel is gray, not black camera (April 1)

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

00449. Alternate to Electroless Nickel for Plating on Plastics open Q. (August 20)
11290. Electrolytic nickel on electroless nickel gasses violently (August 9)
26663. Rusting of Electroless Nickel plated parts open Q. (July 9)
13785. Reactivate electroless nickel without current (June 18)
35056. Electroless Nickel Plating with Silicon Carbide Particles (June 15)
18069. Alternative to chromic acid etch for plastics? (May 5)
24114. Discoloration of immersion tin plating open Q. (April 15)
46404. How to mix PTFE into an EN plating bath open Q. (April 9)
09379. Electroless Nickel Plating of Steel Molds for Plastic Injection Molding (April 7)

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

07846. PVD coating color control -- Looks good initially but darkens in a day open Q. (August 13)
14081. Applying PVD metal coatings to ceramic tiles (April 17)
07846. PVD coatings: color control issues (March 9)

    2f. GALVANIZING, ALUMINIZING, HOT TIN DIPPING

50428. Formulating galvanizing flux to minimize fuming (August 6)
47534. Galvanising Plant Dross Has Doubled (August 2)
57322. Want 100 µ m galvanizing on 0.5 mm thick sheet (August 1)
24269. Galvalume/zincalume-coated steel structural studs open Q. (July 30)
33979. Galvanizing a weldment of steel and stainless steel (June 20)
49676. Can we use Elkometer for measurement of galvanize coating (June 20)
25997. Chromate Passivation at quenching tank (June 17)
41998. What galvanized sheet grade for 1000 hours salt spray? (June 15)
57860. Fish-boning on galvanized surface (May 21)
38915. Does sulfur content in rolling oil composition affect the galvanizing? open Q. (May 16)
60959. Galvanized Rainwater Goods on Barn of Larch & Douglas Fir (May 8)
39461. Black spots in hot dip zinc coated wire (April 17)
44978. Galvanizing kettle furnace and burner design (April 12)
06056. Galvannealed vs. Hot dip galvanized open Q. (April 7)
57163. Galvanizing surface defect (black spots) open Q. (April 6)
57418. Double Dip or Single Dip for Galfan? (April 6)
40753A Moving zinc from old galvanizing kettle to new (March 25)
15958. Hot dip tinning of copper is yellowed open Q. (March 21)
39907. Steps for hot dip galvanizing open Q. (March 17)

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

39444. Removing excess oil on phosphated fasteners (July 12)
11740. Black oxide process works on some ferrous materials but not all (June 18)
13935. Black oxide rubs off open Q. (May 28)
11628. Why did most of the part accept bluing except a 3 inch section? open Q. (May 24)
11740. Black Oxide coating for steel (May 12)
36214. Composition of cold blackening solutions for steel, iron, ferrous metal (April 19)


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

09101. Can WS2 Dri-film adhere to Silicone? open Q. (May 24)
05718. Description of Malcolmizing Process open Q. (May 6)


3. ORGANIC FINISHING PROCESSES . . .

    3a. ELECTROPAINT PRIMING, AUTOPHORETIC COATINGS

41658. E-coating of galvannealed material open Q. (August 10)
46042. Recovering paint from CED E-coat rinse with Ultrafiltration open Q. (August 10)
57561. Pin holes in CED e-coating open Q. (August 1)
53205. E-coating vs. Zinc plating open Q. (July 22)
53135. What is the role of CED in phosphating? (April 15)
32574. Having 7 different problems in CED coating open Q. (April 1)

    3b. POWDER COATING

23304. Powder Coating Adhesion Testing camera open Q. (August 20)
42644. Pinhole problems in powder coating of anodized aluminum open Q. (August 6)
04745. Powder Coating over Galvanized Steel camera open Q. (June 25)
18298. Problems in textured powder coating sheen (June 25)
07268. Silkscreen on Powdercoat adhesion problem open Q. (June 2)
15333. Can I do M.E.K. rub test on just the masking tape to avoid hurting the part? open Q. (May 28)
49514. Problems with powder coating powder caking/clumping open Q. (May 21)
37147. Powder coating reclaim -- does anybody take recycled waste powder? open Q. (May 17)
26699. Powder coating thickness for steel furniture in high humidity (May 16)
32204. Can I import raw aluminum from China and have it Powder Coated in the USA? open Q. (May 2)

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

51966. Torn membrane in CED e-painting open Q. (August 15)
28527. Vacuum metalizing topcoats (July 3)
14122. Re-anodizing a computer keyboard frame (June 8)

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

29247. Teflon coated hangers acceptable for continuous use in heated area? open Q. (August 20)
60877. Does Wash Primer have Hexavalent Chrome? (July 19)
26015. Recoating new PVDF coated panels to change their color open Q. (July 16)
34465. Pre-coating for sublimation transfers onto ceramic open Q. (May 14)
57718. How to paint on HIPS plastic materials (May 9)
33467. Is there a way to make paint more resistant to heat (April 12)


4. POST-TREATMENTS

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

33081. Blackening won't adhere to nickel electroform (August 13)
55350. What treatment should we give to pre-galvanized EMT conduit? (January 20)

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

34791. Soldering nickel plated and laser marked components open Q. (August 6)
45934. Nickel plating followed by tin plating is blistering (July 18)
55972. Black stained areas on annealed surface open Q. (July 3)
23078. Hydrogen de-embrittlement cycle for fasteners (June 7)
01747. Nickel-chrome plated parts are cracking when hammered open Q. (May 7)
15043. Problems in Annealing of Copper Wire open Q. (March 24)

    4c. STRIPPING, REWORKS, ETC.

41112. Even aircraft stripper won't remove powder coating (August 2)
22156. Stripping paint from polyketone hooks open Q. (July 26)
26547. Can Sodium Meta nitrobenzene sulphonic acid be used to make nickel stripper? open Q. (July 26)
03563. How to strip phosphate coating (June 28)
24058. Stripping 10 microns of chrome on steel (June 21) vip
38954. Stripping Dry Lube in Welded Area to Prep for E-coating (June 15)
41112. How to remove Powder Coating from aluminum (May 23)


5. SUPPORTING ISSUES

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

60971. How to test hard chrome plating operation without using dangerous copper sulphate test open Q. (August 20)
50132. Q&As on Operation of ASTM B117 Salt Fog Test Chambers open Q. (August 7)
09676. Nickel and Tin Plating Fails Humidity Test (July 27)
41155. How to analyze for copper and NaCl in a Boric Sulfuric anodizing tank? open Q. (July 16)
57140. Nitric acid passivation solution turned blue (June 28)
58404. Need equipment for EN 2831 Slow Bend test open Q. (June 28)
12425. Cyanide Wastewater Analytical Result Variations (June 25)
35121. Metal contamination analysis in chrome (June 17)
42472. Hydrogen pick-up test of titanium open Q. (June 15)
41654. Determining nitric acid concentration (May 17)
35573. Chromated zinc parts pass salt spray test per one testing house but not another open Q. (May 1)
40408. How to dissolve stainless steel to estimate manganese? open Q. (May 1)
51596. Interpretation of EDX spectrum result: Weight % vs. Atomic % camera (April 11)
35573. How many salt spray hours for painted structurals? open Q. (April 8)

     5b. WASTE & WASTEWATER TREATMENT, POLLUTION CONTROL

32443. pH of DM water is a mystery (August 13)
32633. Clarifier rise velocity calculation (August 13)
52466. What is Cation Conductivity (related to high pressure boiler) (August 13)
49809. Is an RO System beneficial for a DM plant? (August 12)
12215. Change Hexavalent to trivalent chrome (August 9)
14035. Neutralizing nitric acid with sodium bicarbonate (July 8)
59691. Sodium Metabisulfite and its reaction with water open Q. (July 7)
41896. High TDS and soluble salt problem in effluent treatment (May 31)
22905. DI water is attacking PVC and Polyethylene Piping (May 24)
39370. Zinc in stormwater runoff (May 23)
39112. How to wash filter cake? open Q. (April 23)
32578. Chrome plating mist /fume control (April 22)
33660. How to improve pH for DM water open Q. (April 11)
33620. Inexplicable pH drop in boiler blowdown water (April 10)
17230. About CO2 in demineralized water open Q. (April 2)
59691. Sodium Metabisulfite for Water Treatment (March 13)
29294. How much nickel with 304SS pressure cooker leach? open Q. (March 12)

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

22551. Is there a danger in Cast aluminum cookware? (August 15)
40784. Chromium allergy developed from inspecting galvanized items open Q. (August 6)
52592. Toxicity of drinking from old silver plated cup (August 6)
35556. B-B-Q grate has copper showing through (July 21)
37601. Can you safely cook or store food in galvanized trash cans? (July 21)
14264. Are yellow-green BBQ flame deflectors toxic? open Q. (June 25)
38402. Making tobacco pipes out of copper (June 18)
22369. Do Three 55-gallon drums of vanilla require hazmat endorsement & placards? (June 17)
34002. Dangers/Toxicity of inhaling muriatic acid fumes open Q. (June 14)
28905. Can a delaminated cooking pan be dangerous? open Q. (May 28)
10986. Swallowing Muriatic Acid (May 7)
60955. Is Melchoir safe? (April 23)
02632. Handling cadmium plated parts (April 18)
34155. Removed teflon from pan, but tiny dots remain video(March 28)

    5d. PLANT & PROCESS ENGINEERING, CONSTRUCTION

10704. Pump spec for degreasing tank camera (June 18)
11465. Sludge buildup on heating coils in phosphating tank open Q. (June 6)
26187. Will NaOH solution corrode 316SS? (June 6)
01177. Avoiding use of lead in anodizing (June 4)
41678. Preventing damage to plating racks (May 21)
06364. Plating barrel danglers and other maintenance problems (May 2)
41698. Holding work in process for cleaning check without corrosion (March 13)

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

44848. Surface finish Rz and RHSC requirements open Q. (August 20) 29054. Phosphating zinc plating instead of chromating? open Q. (August 15)
26629. Questions about zinc electroplating specification MF ZN 5C open Q. (August 13)
60969. Cyclic Trends and Seasonality within the Industry open Q. (August 9)
54612. In-house test for passivation of stainless steel open Q. (July 23)
07070. Who does ASTM G32 Cavitation Test? open Q. (April 18)
04379. Phosphoric acid anodizing per ASTM D3933-98 open Q. (April 7)
54825. Is Wash Primer Required for Painting over Cadmium Overplating? open Q. (March 27)
31926. Waterbreak testing (March 13)


    5f. WORLD WIDE WORD OF THE WEEK

38818. Almite Coating Revisited open Q. (August 3)
34019. IS A CHROMIC ACID DIP THE SAME AS ANODIZING? (July 18)
32305. Sera blowholes in aluminum die casting open Q. (July 16)
60968. Convert KLY to KiloJoules (July 9)
49424. Rejects vs. defects (June 19)
26940. What does Sursulf Oxynit mean? (April 12)
60946. Clean and descale per STO110LA0008 open Q. (March 17)

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

58218. Difference between ASTM B633 type III and type V chromating (August 9)
10026. WHY aren't trivalent chromates self-healing? (June 3)
11462. Alternatives to trichloroethylene to clean or vapor degrease parts (March 4) vip

    5h. MOSTLY METALLURGY; Heat Treatment

45435. Removing magnetism from 304 Stainless Steel (August 11)
51470. Hardening EN8 / EN9 parts. Q&A's, Problems & Solutions open Q. (August 2)
10948. Remove heat treat scale from stainless steel open Q. (June 2)
11874. Annealing Beryllium Copper (BeCu) open Q. (May 30)
28871. Hardening 304 & 316 stainless steel (Austenitic) open Q. (May 16)
21169. Best abrasive disc for cutting stainless steel? open Q. (May 1)
45235. Will stainless discolor to copper color when heated in a vacuum open Q. (April 26)
23834. Is Nital Etch needed if grinding is only Before heat treating? (April 24)
12545. Annealing Stainless Steel open Q. (April 17)
52552. How to make shoes molds from cast iron open Q. (March 25)
00336. Rusting of stainless steel at weld (March 19)
46264. Vacuum Furnace Discoloration of Inconel 718 open Q. (March 11)

    5i. PRECIOUS METAL RECOVERY

34676. Refining Gold Flakes in Clay open Q. (August 18)
34532. Solution for precipitating gold from HAuCl4 solution camera open Q. (August 4)
26353. Cleaning gold that has been burned (July 16)
22253. Refining of Palladium and making its salt (July 11)
33616. Gold Recovery for Dummies open Q. (June 18)
05048. How to Extract Gold from Computer Circuit Boards? open Q. (June 5)
37685. Rhodium plating solution refining open Q. (May 25)
32894. The economics of melting gold bars (May 11)
19529. Refining of silver chloride to silver metal open Q. (May 3)
54096. Can gold be reclaimed from reflective glass? open Q. (April 28)
22867. Are "We Buy Gold" stores reputable? (April 10)


6. CONSUMER, RESEARCH, & STUDENT ISSUES

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

23038. How to do safe silver plating on sea shells open Q. (August 20)
14468. Polishing compound is dried up open Q. (August 20)
10626. Will laundry pen markings wear off my plastic backpack and stain my clothes? (August 20)
19866. Galvanized zinc tabletops outside (August 17)
20395. Rhodium plating didn't solve metal allergy (August 16)
20702. Re-anodize of aluminum cookware (August 15)
21436. Protecting bronze gravemarkers open Q. (August 15)
07229. Cleaning a silver plated lamp open Q. (August 15)
26438. Type 304SS anodes for gold plating? (August 15)
22490. Painting aluminum swimming pool coping (August 13)
50258. How to bake Powder Coating at home open Q. (August 10)
58983. Can't get even patina on gutters and leaders camera open Q. (August 10)
11353. Easy yellow chromating of clear zinc plated fasteners (August 9)
38381. Painting brass fireplace doors (August 6)
39781. Restore patina on antique brass sink basin open Q. (August 3)
59257. Replating foot pegs on Norton motorcycle (August 3)
49779. What is the base metal for silver plated flatware? (August 2)
53765. Copper sink stains and discoloration open Q. (August 1)
37065. What roller do you use with cellulose paint? (July 30)
06873. Asphaltum / Old Japanning Paint Recipe wanted (July 28)
27488. Value of silver baby cup? (July 26)
41517. Is 0.25 plating better than 0.03? (July 23)
37324. Rhodium allergy? (July 21)
28610. How long should a rhodium plated black finish last? (July 19)
49168. How functional is copper plated steel as artwork? (July 19)
18884. Hoyt Metal Ingot. What type of metal do I have? (July 14)
40164. Matching old nickel plating on Colt Python (July 8)
44219. Corrosion in Ford diesel fuel tanks open Q. (June 28)
35498. Painting outdoor aluminum furniture (June 28)
07897. Galvanic compatibility of aluminum gutters and copper roof (June 25)
21693. Sealing Aluminum to prevent oxidation? (June 23)
19035. Toilet bowl cleaner turned stainless appliances orange (June 22)
57871. How to clean or polish an 18k gold trumpet (June 22)
19039. Cast Iron Cook Stoves: Where to find parts and how to restore open Q. (June 18)
38112. Electroplating nickel onto grey cast iron open Q. (June 17)
44569. How much is F.B. Rogers teapot worth? (June 15)
50226. Type 202 SS for outdoor kitchen (June 15)
08096. Brass keyfob tarnishes quickly (June 10)
40018. Ruined black enamel kitchen sink finish open Q. (June 7)
43684. Dulling shiny nickel plated hinges (June 6)
25432. Hobbyist plating of zinc-nickel with black chromate (June 6)
32106. Cleaned engine with HCl and coolant is rusty (June 5)
49883. 14K gold chain turned pink-ish/rose gold-ish (May 30)
30403. TVs at Belize resort have short life due to sargasso / hydrogen sulfide (May 28)
21527. Body chemistry and gold & sterling silver (May 24)
48729. My chrome wheels are peeling (May 24)
28788. How thick is 5X plated gold? open Q. (May 23)
30442. What paint do I use on a metal mailbox? camera (May 23)
53424. Activating and gold plating coins for jewelry (May 23)
16875. Avoiding RV galvanic corrosion damage (May 21)
22092. Keum-boo and ruthenium too open Q. (May 20)
02662. Torch blackening of brass open Q. (May 19)
51130. How to remove scratches from stainless with a clear coat on it? (May 19)
35277. How long can brass be buried? (May 17)
09787. Refinishing an antique pie safe open Q. (May 16)
07423. Painting & Ospho camera open Q. (May 15)
40886. Agitation air sizing for electroforming (May 9)
50455. Ruined copper sink with Tarn-X (May 8)
16945. How to keep Corten bench from staining clothes? open Q. (May 8)
31904. Buffing ruined my concrete pavers open Q. (May 7)
60510. Coatings for washing machine basket spiders (May 7)
19226. Want Black Titanium Finish camera (May 5)
15174. Gun Bluing / Cold bluing open Q. (May 3)
30700. How to remove paint/lacquer from silver (April 25)
00085. Problem with Copper electroplating/electroforming (April 23)
51406. Cutting up old fridge door to use as gas barbecue heat shields (April 23)
16430. Painting a gas fireplace (April 22)
19833. Rust prevention with Phosphoric Acid (April 18)
12453. Problems in hobby anodizing (April 18)
14075. What Solution for Etching sterling silver? open Q. (April 17)
17968. Speeding up the "living finish" on oil rubbed bronze open Q. (April 17)
15733. Aluminum pretreatment for powder coating of buzzbaits (April 16)
30186. Lime-Away destroyed stainless steel sink (April 15)
33644. Rainbow "oil slick" coating on pottery and plaster items camera open Q. (April 14)
17478. Sealing rusted steel camera open Q. (April 10)
21437. Want colorful patterns on stainless steel (April 10)
09067. Rave hairspray is not working for sublimation coating open Q. (April 9)
34758. Copper plating staining problems (April 9)
35145. Brass is pink from improper cleaning open Q. (April 8)
01574. How to estimate surface area for anodizing (April 6)
48051. Why is rhodium plating so expensive? (April 4)
58843. Removing gold plating on tungsten carbide ring (April 2)

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

60970. How to Make Black Nickel Thin Film from Ni2O3 Powder open Q. (August 15)
22644. Increasing plating speed with agitation, eductors, or non-aqueous baths open Q. (August 4)
29662. The Role of Sulphuric Acid in Copper Plating open Q. (August 4)
02252. Applying Teflon to non-anodized aluminum? open Q. (July 16)
49165. Speeding up rusting/oxidation of metals with ferric chloride & peroxide open Q. (July 16)
57929. Formula for electroless nickel plating solution (July 2)
00284. How to etch epoxy for electroless plating? open Q. (June 8)
46268. Does bright gold plating require bright nickel underlayer? (June 6)
13738. Questions about Immersion Plating / Replacement Plating (April 10)
50837. Walls of vacuum chamber became discolored (March 3)

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

33608. Coke is still supposedly dissolving pennies (August 11)
04134. Copper sulphate reaction with steel wool (May 6)
27653. How long does it take for pennies to corrode? (April 24)
26899. What metals rust the fastest (April 18)
47743. How long does it take for copper and steel to rust? (April 9)

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

33143. Stiffel lamps need repair open Q. (August 20)
20443. Difference between pure silver and sterling silver open Q. (August 16)
21692. Convert GSM coating thickness to microns (August 15)
58463. Any practical way to add pitch to garage floor? open Q. (August 13)
52212. Cleaning blackened bank notes (July 25)
11377. Taking an antique brass bed apart camera open Q. (July 19)
24359. Barber Chair Restoration Q&A's and Successes open Q. (July 11)
26096. Bamboo flooring problems (July 11)
09128. Copper Sulphate as Swimming Pool Algae Remedy? open Q. (June 27)
33151. Looking for a magnet that can attract gold (June 23)
12373. Zinc oxide production by French process (June 18)
13393. Preparing sea shells for crafts or display open Q. (May 17)
21381. How to test the Aimpon to find out it if it is fake? (May 9)
44362. Swallowed Sodium Hypochlorite during root canal (April 24)
00283. Is my Kenrick brass door knocker a counterfeit? camera (April 20)
02754. Hanson Van-Winkle Munning (H-VW-M) memories & memorabilia open Q. (April 18)
52413. Can lead anodes be used in hydrogen generator open Q. (March 24)
04902. Sun reflection from windows is melting plastic siding on neighbor's house! camera (March 17)
03096. Shielding your home from a power transformer open Q. (March 17)
17903. Tile contractor's muriatic acid corroded our stainless steel appliances camera (March 10)
13807. Need very high friction non-pneumatic wheel coating for Bonneville Salt Flats car (March 9)

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
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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