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The finishing.com HOTLINE public forum

New postings Thursday Oct. 21 clock EDT (NYC)

Threads are listed newest first, and in these Categories:
 0.Choosing a Finish: Corrosion. Compatibility
 1.Preparation: a. Mechanical Prep b. Chemical Pretreatments c. Masking & Racking
 2.Inorganic Finishing: a. Stainless & Titanium b. Anodizing & Light Metals c. Electroplating & Electroforming
d. Electroless Plating e. PVD, Vacuum Processes f. Galvanizing, Hot Dipping
g. Black Oxide, Bluing, Coloring h. Other Inorganic Processes
 3.Organic Finishing: a. CED, Electrocoat b. Powder Coating c. Lacquers, Clearcoats
d. Painting, Printing, Adhesives
 4.Post-treatments: a. Chemical Post-treatments b. Baking & Drying c. Stripping, Reworks, etc.
 5.Supporting Issues: a. Analysis, Lab, QA/QC b. Water & Wastewater c. Safety, Emissions, Toxicity
d. Plant & Process Engineering e. Specs, Books, Stats f. World Wide Word Of The Week
g. Mostly metallurgy h. Precious Metal Recovery
 6. Non-industrial: a. Artists, Hobbyists, DIY b. Research, Thesis work c. K-12 Science
 7. Not Metal Finishing: Off Topic, but Interesting

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

Need gold plating directly on titanium (October 12) open Q.

Need high resistivity biocompatible plating on nichrome (October 10) open Q.

Convert anodizing line to another process (September 29) open Q.

Acid resistant coating for aluminum (September 9) open Q.

61313-1i Powder Coating tiny blades for fishing lures open Q. (August 25)

Chrome vs. Powder Coating of Motorcycle rims (July 24)

Need scratch resistant, conductive, black coating on copper strip (July 5) open Q.


1. PREPARATION . . .

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

Polishing Intricate Stainless Steel Spheres and Concave Mirrors (September 28) open Q.

Need mirror finish on Socket & Philips screws (August 29) open Q.

Polishing copper and brass (August 25) open Q.

What media will allow tumble finishing in 30 minutes? (August 15)

Sand blasting standards: Swedish SA 1, SA 2, SA 2.5, SA 3 vs. NACE & SSPC (August 1)

RMS vs Ra (July 9) open Q.

Maximum groove depth in nickel plating with diamond cutting (July 5) open Q.

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

61342i Black stripe on cleaned and annealed cold rolled coils (October 12) open Q.

Loss of weight in acid pickling (October 9)

How to make phosphating solution (September 27) open Q.

Problems and solutions in zinc phosphating (September 27) open Q.

Black Oxide vs Phosphate (September 18)

Powdered metal parts rusting after pickling process (September 16) open Q.

Chemical & Electropolishing of Brass RFQ Thane India (September 15)

Electroplating without acid pickling (September 14)

Degreasing copper cylinders for chrome plating (August 21) open Q.

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

Need masking help for anodizing (September 25)


2. INORGANIC FINISHING PROCESSES . . .

2a. STAINLESS STEEL & TITANIUM PROCESSING

Stainless steel etching -- How To (October 15)

61345i Cloudiness on Type III Anodized Titanium Med Screws (October 15)

Problems & Solutions in Passivation of Titanium (October 12)

Electrochemical Weld Cleaning on 316L Stainless Steel (September 24) open Q.

Anodizing titanium with trisodium phosphate (TSP) (September 24) open Q.

Passivation of 303SS with Nitric Acid Q&A, Problems & Solutions (September 20)

2629i Problems electropolishing stainless castings (August 30)

AMS2488 Type II on Titanium: maximum touch-up area? (August 29) open Q.

Electropolishing small 4xx / 400 series stainless steel parts (August 15) open Q.

5422-5i Electropolishing of stainless steel -- Q&A, Problems & solutions (August 13)

Stainless steel laser etch and passivating (August 9)

Electropolish, Passivate, or Chemical Polish 4140 & 4340 Steel? (July 30) open Q.

56202i Stainless steel passivation color inconsistent (July 30)

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

54981i Wrong finished color for MIL-A-8625 Type III anodize on 7075-T6 (October 21)

61330i Aluminum corrosion after stripping the anodizing (October 15) vipInquirer often helps others, so especially deserves our help

Anodizing a Weldment of Different Aluminum Alloys (October 15)

Anodizing A380 vs. A360 (October 12) open Q.

Temperature limit for chromate conversion coating on aluminum (October 11) open Q.

Where to get glass coated abrasive paper? (October 11) RFQ Denmark vipInquirer often helps others, so especially deserves our help

Big pits on big panels in boric-sulfuric acid anodizing open Q. (October 8)

61335-1i Anodizing problem on AA 5052 Alloy (October 7) open Q.

Plating onto Aluminium without zincate or stannate (October 4)

58771i2 White corrosion spots/pits on chromated aluminum after 1-2 months (September 29)

61302-3i Anodizing is splotchy grey, not black (September 29)

Plating or Anodizing of Aluminum Gears (September 28) open Q.

44778-5i Hard Anodize Type 6061 Aluminum: stains (September 27)

53350-1i Film on anodized parts: is black dye tank contaminated? (September 27)

Chemical conversion coating on top of anodizing (September 27)

Nitric acid drag-in to dye/seal tank (September 27)

Dyed Anodizing Color Matching Q&A, Problems & Solutions (September 27)

Alodine, Iridite, Chem-film not sticking / rubbing off (September 27)

Silver Plating on Aluminum: Blister / Bubble Problems (September 25) open Q.

Only one of the parts on the rack Hard Anodizes (September 24) open Q.

32830i Crazing/Cracking problem in anodizing (September 22) open Q.

37711-2i Lines appear on aluminium profiles (September 19)

What hardness/abrasion resistance from anodizing? (September 16) open Q.

Most practical method to use PTFE to coat hard anodized aluminum parts? (September 15)

Mixing two different part sizes in the anodizing bath (September 13)

Sulfuric Acid Anodize: Cl, F, Sulfide Limits (September 9)

61312i White powder on anodized finish (September 7)

1495-1i Zincating on Aluminum: Problems with 6000 series (September 6) open Q.

61311i Anodizing 0.003" 5052 aluminum? RFQ Palmdale CA (September 6)

How to Chromate Conversion Coat ADC12 Aluminum (September 5) open Q.

61299i White dots on an anodised finish (August 23) open Q.

Thermal conductivity of conversion coatings on aluminum (August 20)

Anodising rectifier and power requirements (August 10) open Q.

Can RoHS Yellow Chromate Survive 168 Hour Salt Spray? (August 9)

Problems with Color of Hardcoat Anodize (August 7)

How to anodize 6061 T6 aluminum and what do I need? (August 7) open Q.

Iridite 17P and RoHS compliant alternates? (August 5) open Q.

How to eliminate anodizing appearance variations (August 5)

Anodizing on 7000/7XXX aluminum is chipping at edges (August 5)

Burning problem in Hard Anodizing of Aluminum (August 4)

Electrical resistance of Class 3 chromate conversion coating (August 4)

61295i Can't get proper black color on hardcoat anodizing (August 3)

Nickel Plating on Aluminum Adhesion Problem (July 30) open Q.

Metallic Contaminants in Sulfuric Acid Anodizing Bath (July 26)

Special light & glasses to reveal whether aluminum is anodized (July 24) open Q.

Alodine is not properly coating some aluminum alloys (July 22) open Q.

De-smutting/De-Oxidizing of aluminum (July 21)

Acid vs. Alkaline Etch before Chromic Acid Anodizing vipInquirer often helps others, so especially deserves our help (July 19)

Anodized aluminum is inadvertently scrubbing N2O gas (July 13) open Q.

Minimum anodizing thickness for good dark black? (July 13) open Q.

Horizontal anodizing of aluminum sheets (July 10)

Aluminum Anodizing flakes off when heated to 125 °C (July 7) open Q.

Black spots in anodized aluminum profile (July 2) open Q.

Anodized surface is powdery (July 2)

2c. ELECTROPLATING and ELECTROFORMING

Problem of white spots after Zinc Plating (October 21) open Q.

Granules form when acid copper plating? (October 19)

55350-1i Hexavalent chromate is okay, trivalent gets white rust and black spots in 96 hours (October 19)

Can we improve our tin plating Salt Spray results? (October 19) open Q.

Nickel plating anticipated salt spray test hours (October 18) open Q.

1871i Pitting during use on Hard Chrome plated roller (October 15) open Q.

What should be exact distance from hard chrome anode to cathode? (October 12) open Q.

Maximum allowable thickness of nickel plate under silver plating (October 11) open Q.

zinc plating Zinc plating defects (Quality of metal finishing) (October 10)

5135i Pitting & Bubbles in Hard Chrome Plating (October 9) open Q.

Problems with tin plating over copper or brass (October 9) open Q.

Need Decorative Nickel Plating for Microphone Bodies RFQ Nashville TN (October 8)

Metal plating of babbitting (October 5) open Q.

Our copper plating anodes are turning black (September 30) open Q.

Conductivity of the zinc plating with chromate conversion coating (September 29) open Q.

Want more brightness & hardness, and better LCD coverage, in HEEF-25 Chrome Plating (September 29) open Q.

23685i Rose gold plating is rusting (September 27) open Q. 2nd Rqst

44771i2 Acid Copper Plating Problems (September 25)

Differences between chloride (acid) and alkaline zinc plating (September 25)

HCl causes parts to blister (September 24) open Q.

Nickel plating plus rhodium as substitute for silver plating (September 23) open Q.

28851-5i Very early rusting of zinc-nickel plated screws (September 23) open Q.

Need tin plating on 100 aluminum chain saw pistons RFQ WA Australia (September 21)

Cyanide copper solutions temperature and anodes (September 19)

4925-1i Hard chrome plating troubleshooting (September 18) open Q.

Hard Chrome Plating on Hydraulic Cylinders Scratched by Seals (September 18) open Q.

Need Plating onto Tungsten Powder RFQ Cohasset MA (September 15)

Need brass plating on aluminum frames RFQ Overland Park KS (September 14)

Nickel striking of stainless steel (September 9) open Q.

Black spots on brass and copper plating (September 6) open Q.

54204i Soft chrome under hard chrome plating for salt spray resistance (August 30)

61306-1i Zinc plating problem (August 29)

Silver plating over aluminum for PIM (Passive Intermodulation) avoidance (August 19)

33774-2i Vermeil jewelry is tarnishing (August 12)

Zn blue passivation turns yellowish (August 12)

Tin Plating Problem (August 12)

How to plate copper wire with lead (August 7) open Q.

Electroforming onto silicone forms RFQ Woodland CA (August 6)

Hard Chrome plating of zinc die castings (August 5) open Q.

Chrome Plating Problems on Gravure Printing Cylinders/Rolls (August 5)

How to "Distress" Chrome Plating RFQ Cambridge UK (August 2)

Reducing chloride concentration in acid copper bath (July 30) open Q.

Titanium-Cadmium Plating Q&As (July 27)

Unplated area inside blind holes is rusting (July 19) open Q.

Alkaline Zinc Plating Q&A's, Problem: White Patches After Chromating (July 19) open Q.

Cadmium Plating Is Peeling from Nickel Plating (July 18) open Q.

Potassium Chloride Shortage for Zinc Plating Is there an alternative? (July 18) open Q.

Tin plating anode problems (July 16) open Q.

Tin plating discolors (turns yellow) (July 16) open Q.

Zinc-Iron Plating with Trivalent Chromate fails 240-hour salt spray (July 15) open Q.

Zinc plating failing 48-hour salt spray? (July 12)

Bleed-out from seams after zinc plating (July 9) open Q.

34107i Zinc-plating appearance problems (July 5)

Conductivity of Zinc-Nickel Plating & Chromating (July 5) open Q.

Troubles with rose gold plating (July 4) open Q.

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

`

61339i Electroless nickel plating testing with UAN solution (October 14)

Electrical conduction properties of electroless nickel plating (October 14) open Q.

Sodium Hypophosphite alternate chemical? (October 5) open Q.

Screen printing onto Electroless nickel Plating (September 27)

Electroless nickel to prevent high temperature oxidation of copper (September 18) open Q.

Factors affecting Electroless Nickel deposit rate (September 6)

How to determine plating defect vs. plastic substrate defect (August 28)

Palladium activation for EN Problems & Solutions RFQ Mumbai India (August 17)

Can Electroless Nickel Plating be Machined? (July 18) open Q.

Formula for electroless nickel plating solution (July 2) open Q.

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

Aluminum PVD on PC Temperature Endurance (October 2) open Q.

PVD coatings: color control Q&A's (September 18) open Q.

Coating & Finishing of Titanium for Biomedical (August 21) open Q.

PVD gold color control and matching Q&A's, Problems & Solutions (August 14)

Vacuum Cad plating adhesion problem on 13-8 stainless (July 17) open Q.

2f. GALVANIZING, ALUMINIZING, HOT TIN DIPPING

Rough & lumpy low quality galvanizing (October 15) open Q.

56867i Spotting, Staining, Blackening of Hot Dip Galvanized Finish (October 14) open Q.

Aluminium addition to Galvanising Kettle (October 10) open Q.

GP concertina wire rusts only when sent to some cities (October 10) open Q.

Risk to galvanizing kettle from low zinc level? (September 28)

61324-1i White patches on new hot dip galvanized poles (September 23)

61316-1i Hot-Dip Tinning Problem: Crystals in molten tin tank (September 13) open Q.

61293i Chrome-free galvanized pipe gets black spots (August 23)

44978i Galvanizing kettle furnace and burner design (August 21)

39461i Black spot problem on hot dip galvanized mesh (August 18)

Chemical to Remove slag/dross of zinc from hot dip galvanizing (August 10)

Excessive generation of dross in zinc kettle startup (August 10)

Is yellowish/green dichromate appearance on galvanizing a process defect? (August 10)

61296i Get zinc out of 5000 lb mold after cooling (August 10)

61283i Finish on zinc coated steel coil for prefabricated housing (July 2) open Q.

Pimples on hot dip galvanizing (July 2)

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

Black oxidation layer went off after shooting test (August 5) open Q.

Testing the quality of blackening coating (July 16)

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

Dacromet coating questions (July 23) open Q.


3. ORGANIC FINISHING PROCESSES . . .

3a. ELECTROPAINT PRIMING, AUTOPHORETIC COATINGS

Misc. problems in CED (cathodic electrodeposition) coating (September 26) open Q.

Foaming in phosphate tank causes CED defects (August 10)

Emissivity of e-coating vs. powder coating (August 8)

Pin holes in CED e-coating (July 4) open Q.

3b. POWDER COATING

Powder coated steel is blistering (October 18) open Q.

Powdercoating stainless steel Q&A's, Problems and Solutions (October 12) open Q.

2368i Powder coating on zinc die-castings (August 16) open Q.

Touching up powder coating (August 10)

Mixing powder coating colors to get a new color (August 10)

Alternatives to powder coating (July 27) open Q.

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

Coatings for metal spectacle frames (August 30)

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

Poor adhesion between epoxy primer and urethane top coat (October 6) open Q.

Fire and vandal-resistant coatings for rolling stock (September 20) open Q.

Seeking Rainbow Coating on Fish Hooks (September 15) open Q.

Candy apple coating for brushed steel (August 26) open Q.

15909i Training on plastisol chemistry and application? open Q. (July 7)


4. POST-TREATMENTS

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

Conductivity of olive drab chromate on cadmium (September 22) open Q.

20303i White colored spots on chromated zinc plating (July 23)

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

What if we bake for hydrogen embrittlement relief at 300 °C? (October 2)

Standards for Hydrogen Embrittlement Relief after Zinc-Nickel Plating (September 6) open Q.

Soldering issue when using a Silver-bearing Soldering Alloy (July 9) open Q.

4c. STRIPPING, REWORKS, ETC.

Stripping Silver Plating from brass (musical instruments, etc.) (September 25)

Stripping the glass from a glass-to-metal seal (August 9) open Q.

Stripping aluminum with caustic soda (July 27) open Q.

Removal of tin plating from copper (July 14) open Q.


5. SUPPORTING ISSUES

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

How to make 0.1N sulfuric acid (October 14)

Cyanide Brass/Copper plating Solution Analysis (October 11)

61338i Q-Panel Envelopes...Where to buy them? (October 10) open Q.

Determine % Nitric Acid. Titration? Conversion factor? (October 8)

Salt Spray Test -- ASTM B117 Operational Problems (October 4)

Titrimetric/spectrographic method for iron & copper in chrome bath (September 29) open Q.

How to measure amount of Gold used and left in the plating bath? open Q. (September 28)

Procedure for chromic acid and sulphate determination (September 24) open Q.

Converting Baumé to Concentration (September 9)

Soak Cleaner / Degreaser: Alkalinity test & oil content (September 2) open Q.

Gravimetric analysis of gold plating bath (August 29)

Electrical Resistance Testing of MIL DTL-5541 Chromate (August 26) open Q.

4408i How to Analyze/Titrate a Hardcoat Anodizing Tank (August 20) open Q.

Caustic Etch Analysis -- aluminium anodizing (August 14)

Converting percent by volume to oz/gal (August 9)

How to test hard chrome without copper sulphate (July 19) open Q.

Guidelines & best practices for purchasing a salt spray chamber (July 13) open Q.

Dubpernell test method for chromium plating (July 10) open Q.

Determination of sulfuric acid in chromium bath (July 5) open Q.

Correlation between accelerated weathering & natural weathering (July 1) open Q.

5b. WASTE & WASTEWATER TREATMENT, POLLUTION CONTROL

Recovery of tin from waste plating solutions (September 30) open Q.

Wastewater Treatment: Sulphate Removal from Anodizing Wastewater (September 24) open Q.

Floating Sludge Problem in Wastewater Treatment (September 24) open Q.

Wastewater Flow Meter Needed (August 2) open Q.

Chromium in my Anodizing Waste? (July 18)

Ion Exchange / DM plant calculations (July 13) open Q.

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

How poisonous is Potassium gold cyanide? (October 2)

Danger from galvanized planting boxes? (September 18) open Q.

What happens when one inhales sulfamic acid dust? (September 13) open Q.

Stainless pot left on the burner; are the fumes dangerous? (September 7)

Does drinking milk really help with metal fume fever? (August 29) open Q.

How toxic is chrome plating on my faucet (August 2)

5d. PLANT & PROCESS ENGINEERING, CONSTRUCTION

Buffer pads for McClary Easy Polisher Scrubber (October 19) RFQ Ontario

Removing dummy cathode from nickel tank knocks the copper back in (October 19) open Q.

Hard chrome plating: Amperage increases although Voltage is constant (October 18) open Q.

Linear Positioning Systems for Programmed Hoists (October 11)

Separate nitric acid from mixture of nitric & sulphuric acid (October 10) open Q.

Is filtration required for acid zinc plating? (October 10) open Q.

Acid etch (ammonium bifluoride) solids handling RFQ Toronto (October 9)

Copper Plating Issue: Uneven distribution (September 29) open Q.

M.O.C. for nitric-sulfuric tank for stripping silver (August 19) open Q.

Chrome plating mist /fume control (August 12) open Q.

Hard anodizing chiller sizing for 5-gallon tank (July 30)

Nickel Sulfamate Plating ventilation & safety issues (July 23)

Tank material for hard chrome plating (July 9)

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

REACH Regulations Affecting the Plating and Metal Finishing Industry (October 21)

Can I do MIL-DTL-16232 phosphatizing on galvanized items? (October 15) open Q.

Penetrant inspection per ASTM E-1417 (October 6) open Q. 2nd Request

Good Reference Books for Electroplating (September 21)

Meanings of plating spec abbreviation: MFZnIII (August 31) open Q.

Is touching up anodized with Alodine/Iridite/Chem-film/Chromate allowed? (August 18)

Industry specs for powder coating thickness (July 29) open Q.

Silver Plating is Blistering. Interpreting AMS 2411 Requirements (July 21)

NADCAP & NADCAP Audits (July 20) open Q.

5f. W...W...W...WORD OF THE WEEK

What is Continuous Gold Plating (July 2) open Q.

5g. MOSTLY METALLURGY; Heat Treatment

Must copper wire be annealed for drawing? (October 14) open Q.

Need copper masking & carburizing (October 4) RFQ Chennai India

How to anneal mild steel (September 18) open Q.

Cast Aluminum Cookware: What Alloy is Best? (August 26) open Q.

Post treatment of steel after quenching process (August 14) open Q.

Inconel 718 turns black during pickling only if heat treated (August 5) open Q.

How to separate copper from silver (July 13) open Q.

5h. PRECIOUS METAL RECOVERY

Finding the purity of silver in silver alloys (October 16) open Q.

Is this ore/rock Platinum, Palladium & Rhodium? (September 30) open Q.

Want to sell a 4-pound chunk of 20% iridium (September 22) open Q.

Cleaning gold that has been burned (August 29)

Recycler asks about extracting silver with steel nails and salt? (August 29)

34676i Best and Easiest way to refine gold dust to get 99.9% purity (August 29)

Problems in recovering gold from soil (August 28)

Separation of Gold metal from Immersion Gold Solution (August 23) open Q.

How much gold in a pound of computer memory sticks (August 12) open Q.


6. CONSUMER, RESEARCH, & STUDENT ISSUES

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

Stumbled onto good metallizing method for electroforming (October 20) open Q.

Copper sink turned black (October 20) RFQ Underwood ND

Must I remove glued-on plastic from sill plates before anodizing? (October 18)

How to make wood finish wrinkle paint (October 15) open Q.

Cleaning the interior of an air compressor tank (October 12) open Q.

Replace zinc plating on motorcycle fasteners with nickel plating (October 12)

55866i Finish for a copper radiator/heatsink. Cleaning copper & solder (October 12) open Q.

Antiquing Paint / Faux Wood Finishes (October 5) open Q.

Can Cast Aluminum be Anodized? (October 5)

Need old, tubular chrome furniture steel wooled and chrome polished RFQ San Francisco CA (October 5)

Can citric acid clean a catalytic converter? open Q. (October 4)

Nickel plating before acid copper? (October 2)

Designing a plating setup to plate 2" diameter plastic coins (September 30) open Q.

Protective coating for brass elevator doors (September 30)

Anodizing titanium to blue color (September 30)

20193i Chroming carbon fiber/plastic (September 28) open Q.

Chromating carburetors/diecastings (September 21)

Scratched and Dull Surface on Stainless Steel Refrigerator Door (September 20) open Q.

Painting cast iron fountains / restoring rusty fountains (September 20) open Q.

Anodizing of Aluminum Screws and Threads (September 19)

RIT dye for dyeing? (September 16) open Q.

33689-1i Rusted sheet metal HVAC ducting (September 15) open Q.

Painting copper gutters (September 15) open Q.

How to darken aluminum (September 14)

How to remove stove polish so wood stove can be painted? (September 14) open Q.

Electroforming a complex shape in thick copper (September 9)

Why Noxon Brass and Silver Polish Disappeared (September 8)

Copper remains on welding clamps despite muriatic acid bath (September 6) open Q.

1298-2i Nickel plating musical instrument valves (September 5) open Q.

How to strip Powder Coating from steel? (September 4)

Help, my yellow brass turned pink (September 3)

39638-1i Desperately Need Gillespie Antique Restorer (September 2)

61318-1i Looking to refinish my 1950s Chambers cooktop RFQ Louisville MS (September 1)

Strip newer paint on Geneva Metal Kitchen Cabinets to reveal original (August 31) open Q.

New silver plated euphonium changed color almost immediately open Q. (August 30)

Stainless steel flatware with mirror finish scratches too easily (August 30) open Q.

15303-3i Thai mid-century bronze flatware (August 26) open Q.

Home anodizing-Truths from the experts? (August 26) open Q.

Ruined my brass cabinet handles with vinegar (August 25) open Q.

Melting old gold to make new jewelry (August 25) open Q.

Paint not sticking to Ospho (August 23)

Dark brown or dark copper patina for Nickel/Iron weld (August 20) open Q.

How to Remove Varnish from Brass (August 19) open Q.

11972-4i Recipe for red patina on brass & copper (August 15) open Q.

Determine & control copper concentration in acid copper plating (August 14) open Q.

Restoring the yellow dichromate finish on automobile carburetors (August 13)

Help with unwanted rainbow hues in clearcoat (August 12)

Need to make a silver ring look gold without using gold (August 10) open Q.

Fastener systems for aluminum pool cages (August 9) open Q.

Want to remove the paint from my new refrigerator (August 8) open Q.

Help with a knife blade turned black (August 8) open Q.

30442-4i How to paint this metal mailbox? (August 7) open Q.

61303i Protecting metal tools from corrosion (August 7)

Aluminum motorcycle polishing -- rims, wheels, swingarm, frame (July 29)

Need springs for Antique baby carriage (July 29)

Is 0.05µ gold plating "good quality"? open Q. (July 29)

Repair discolored copper awnings RFQ Chicago IL (July 27)

50888i Damaged the finish on copper table -- HELP! (July 26) open Q.

Restore gold plate/wash on sterling silver cup (July 26)

What to to paint burners on propane stove with? (July 26)

23897i How to identify if old lamp is brass, copper, bronze, or cast iron? (July 21) open Q.

Why black line on face from gold jewelry? (July 18) open Q.

61290i Require Iridescent Passivation Solution RFQ Perth Australia (July 18)

61288i Want "Battleworn Nickel" on AR-15 parts RFQ Hagerstown MD (July 13)

Problems & solutions in copper electroforming (July 12)

Bronze plating of a 1920's funeral fan RFQ Folsom CA (July 9)

Need shotgun barrel blued RFQ Wooster OH (July 9)

Restoring old copper washing basin (July 8) open Q.

Want silver plating instructions (July 7) open Q.

Q&As about Gold Plated Flatware (July 5) open Q.

61282i Seeking finishing suggestions on vintage receiver restoration (July 2) open Q.

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

Arc coating with powders and liquids (October 15) open Q.

Was cyanide ever used in hard chrome plating? open Q. (September 22)

How to electrodeposit PbO2 (lead dioxide) (September 10)

61317-1i Anodized aluminum has microscopic black dots on its surface (August 30) open Q.

Manganese electroplating (Electrodeposition of Manganese) (August 14) open Q.

Plating onto Carbon Fiber: applications, methods, Q&As (July 30) open Q.

Producing hardened concrete nails (July 30) open Q.

Teflon coating of stainless steel (July 29)

History of iron electroplating (July 19)

When to replace magnesium electropolishing solution, or how to analyze? open Q. (July 7)

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

What part does voltage play in electroplating? (October 16)

Zinc Electroplating with vinegar and salt (October 15)

Sodium Hydroxide: How to make to 0.5 M strength (October 11)

What chemical heats up when mixed with water and is safe to drink? (July 30)

Building a really cheap electric arc furnace (July 12) open Q.


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

Cost and availability of iridium (October 21)

M&T Chemicals water tower Hanson Van-Winkle Munning (H-VW-M) memories & memorabilia (October 16)

24359-29i Repair of barber chairs (October 13) open Q.

29370i Identifying rings: Marking system for rings (October 10) open Q.

12362i Coating tables and bar tops with thick clear pourable plastic (October 9) open Q.

Best pipe for natural gas lines: Copper vs. steel, plastic, CSST, etc. (October 5) open Q.

Strong welding fumes in bathroom (September 27) open Q.

Sedgwick Residential Elevators Parts and Maintenance RFQ Granite City Illinois (August 19)

7137i Cleaning Dirilyte Gold-tone Flatware (August 15)

Accidentally Swallowing Sodium Hypochlorite during root canal (July 30)

Hazmat transportation requirements & exclusions (July 21)

Drawn platinum wire as a hinge pin on bracelets & earrings (July 15) open Q.

32144i Markings indicating real gold on jewelry (July 12) open Q.

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