The finishing.com Hotline Public Forum
Need finishing services:
Want "Battleworn Nickel" on AR-15 parts|
[Hagerstown, MD 7/13 - open to all]
Need shotgun blued
[Wooster OH 7/10 - open to all]
Need door handles nickel plated
[Scotsdale AZ 6/16 - open to all]
Need stainless kitchen hood refinished
[Lavalette NJ 5/31 - open to all]
Coater for Automotive Industry Die Cast Parts
[Belleville ON 5/21 - open to all]
Need coater to do Surtec 650 or Iridite NCP
[NC 5/21 - open to all]
Need 1000s of lbs of wheel nuts Teflon coated|
[China or Taiwan 6/26 - open to all]
Need kitchen table refinished
[Watford (near London) 5/21 - open to all]
|Finishing shop needs products & services:|
Seeking Anodizing Consultant|
[GA 5/30 - open to all]
Seeking NADCAP AC7108 Consultant
[CA 4/27 - open to all]
Need PCB Chemicals|
[Mumbai 3/24 - open to all]
0. CORROSION, COMPATIBILITY, CHOOSING A FINISH . . .
• Chrome vs. Powder Coating of Motorcycle rims (July 24)
• Need scratch resistant, conductive, black coating on copper strip (July 5) open Q.
• Inexpensive In-Process Rust Protection/Plating (June 17)
• Does Plastlina/modeling clay accelerate corrosion of aluminum? (June 3) open Q.
• Microwave Oven Interior Reflective Materials (May 27) open Q.
• Inexpensive black electroplated finish? (May 18) open Q.
• What are the finishes on this antique clock? (April 30)
• Choosing Stainless Steel vs. Galvanized vs. Zinc Plated Fasteners (April 28) open Q.
• Zinc-nickel Plating vs. Zinc Flake Dip-Spin Coating (April 21) open Q.
• Plate warps and needs to be stronger and polished (March 23) open Q.
• How to finish wrought iron railings (March 19)
• Corrosion resistant coating for C45 Material (March 3)
• How to protect Beryllium Copper from corrosion by Ammonia (March 1) open Q.
• Does bronze corrode Cr-Mo-V steel? (February 17) open Q.
• Stainless Steel or Galvanized fasteners for Aluminum Siding (February 17) open Q.
• How to avoid rust (February 9)
• Which substitute for hard chromium plating? (February 2) open Q.
• PTFE thin film coating of 316L Stainless steel parts exposed to sulfuric acid (January 27) open Q.
• Alternatives to gold plating for Zari thread (January 24) open Q.
1. PREPARATION . . .
1a. MECHANICAL PREP [GRINDING, POLISHING, VIBRATORY FINISHING, BUFFING, HONING]
• RMS vs Ra (July 9) open Q.
• Maximum groove depth in nickel plating with diamond cutting (July 5) open Q.
• How to polish aluminum steering wheels (June 4)
• Black colorant/dye for liquid buffing compound (May 21) open Q.
• What is difference between Ramax & Ra (May 3) open Q.
• How important is variable speed for a tumbler? (April 8)
• Formula for polishing and buffing compounds (March 16)
• How to Mirror Finish Alumina Ceramics (March 13)
• Need formula to make solid & liquid polishing compound for metal polishing (February 26) open Q.
• Looking for linear grinding/finishing tool practical for non-production use open Q. (January 16)
• Ra vs. Rz: Ra keeps growing, Rz stays the same? (January 2)
1b. PRETREATMENTS [CLEANING, PICKLING, ETCHING, PHOSPHATIZING, ACTIVATION]
• Problems and solutions in zinc phosphating (June 16) open Q.
• Zinc Phosphate coating problems (June 4)open Q.
• Cleaning copper discoloration from baking (March 30)
• How to etch silver without affecting aluminum? (March 5)
• Rack marks in zinc phosphating open Q. (February 4)
• Dip vs. Spray Phosphating (January 11)
1c. MASKING, RACKING, TAPING, PLUGGING, PHOTOSENSITIVE MASKS
• White lines along masked edges when selectively stripping zinc galvanized steel (March 8) open Q.
• Masking for Silver Plating Inside Hollow Aluminum Cylinders (January 24)
2. INORGANIC FINISHING PROCESSES . . .
2a. STAINLESS STEEL & TITANIUM PROCESSING
• Electropolishing small 4xx / 400 series stainless steel parts (July 23) open Q.
• Stainless steel laser etch and passivating (July 23)
• Electropolishing of stainless steel problem: "frosting" (June 8) open Q.
• Coloring stainless steel (May 25) open Q.
• Electroless copper vs. Wood's Nickel strike for stainless steel (May 15) open Q.
• How to recognize passivation frosting? (April 8) open Q.
• Ferritic stainless steel surface finishing (February 24)
• Citric vs. Nitric Acid Passivation of Stainless Steel (February 11)
• Electropolish, Passivate, or Chemical Polish 4140 & 4340 Steel? (February 10)
• Rinsing after Stainless Steel Passivation (February 4)
• Acids for electropolishing stainless steel (February 3)
• Will grit size affect passivation of stainless steel? open Q. (January 29)
2b. ANODIZING AND LIGHT METAL TREATMENTS (Aluminum, Magnesium)
• Burning problem in Hard Anodizing of Aluminum (July 28)
• Special light & glasses to reveal whether aluminum is anodized (July 24) open Q.
• Electrical resistance of Class 3 chromate conversion coating (July 23) open Q.
• Alodine is not properly coating some aluminum alloys (July 22) open Q.
• De-smutting/De-Oxidizing of aluminum (July 21)
• 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)
• Chem-film colors: are gold and yellow the same? (June 28) open Q.
• Stains occur in anodizing only if bright dipped (June 26)
• Can Cast Aluminum be Anodized? (June 22) open Q.
• Understanding differences in MIL-C-5541 Type 1 and 2, and Class 1A and 3 (June 19) open Q.
• Current/Voltage for Aluminum Anodizing (June 19)
• Caustic Soda Etch Tank Suddenly Causing Intergranular Attack (June 8) open Q.
• White powder stains when electrocolouring anodized aluminum (June 6) open Q.
• Blisters when plating copper onto aluminum (June 6) open Q.
• Can sealant surfactants be removed? (June 6)
• How durable is the finish on sandblasted aluminum? (June 3) open Q.
• Dyed Anodizing Color Matching Q&A, Problems & Solutions (June 2) open Q.
• Anode to Cathode Ratio for Electrocoloring of Anodizing (May 30) open Q.
• Sulfuric Anodized 2024 Al turning Pink open Q. (May 28)
• Red Rust on Nickel Plating over Aluminum? (May 23)
• Is touching up anodized with Alodine/Iridite/Chem-film/Chromate allowed? (May 18) open Q.
• Aluminum cathodes for anodizing tanks (May 11)
• Hard Coat Anodize is Chipping and Flaking (May 10)
• Purple type 2 anodizing trouble (May 5)
• Sealing Aluminum to prevent oxidation? (May 5)
• Anodized aluminum galling situation (May 4) open Q.
• Corrosion? on anodized & gold dyed alloy 2024 parts (April 29)
• Cause of white spots on dyed 2024 aluminum (April 26) open Q.
• MIL-DTL-5541 Type I vs. Type II (TCP) issue (April 23)
• Sandblasting and Anodizing Leaves Bright Spot (April 20) open Q.
• Brown discoloration after clear anodizing (April 18) open Q.
• Pitting in Aluminum Threads after Alodine (April 16)
• Problem clear anodizing MIC-6 material (April 16)
• What is the Alcoa Alumilite 226 process and what shops offer it? (April 15) open Q.
• Electropolishing of Aluminum vs Bright-dip (April 13)
• Severe erosion anodizing 7075 aluminum (April 4) open Q.
• Etching turned Aluminum Black (March 28)
• Okay to anodize small loads and largely empty racks? (March 27)
• Aluminum bright dip problems (March 19)
• Beadblasting aluminum plus brite dipping is causing pitting (March 15) open Q.
• Problems Black Anodizing 5052 Aluminum (March 15)
• Pulse anodizing rectifier settings? (March 14) open Q.
• Anodizing Racks: what material of construction? (March 9)
• Sudden drop in Alodine concentration (March 5)
• Anodizing Coefficient of Friction? (March 2) open Q.
• Spotting on aluminum parts with chromate finish (March 1) open Q.
• White corrosion on anodized job after salt spray test (February 25)
• Numerous Type II Aluminum Anodizing Defects: White Spots, Missing Color, Ink Stains (February 24) open Q.
• Anodized Part Absorbs Grease into Oxide Layer Near Edges (February 23) open Q.
• Problems with Color of Hardcoat Anodize (February 23)
• How to etch and color anodized aluminum (February 18) open Q.
• Anodizing seal issue on bead blasted areas (February 17)
• Micropitting issue chromate conversion coating of Aluminum (February 15)
• How to eliminate anodizing appearance variations (February 9)
• Anodizing Color Fades in Autoclave (February 5)
• Water stain prevention for aluminum (February 5)
• Anodizing Appearance Problem on Silkscreened Panels open Q. (January 27)
• Aluminum piping underground. How to do corrosion protection? (January 11)
• High Dielectric Anodizing of Aluminum (January 6)
• Galvanic potential of aluminum after conversion coating (January 4)
2c. ELECTROPLATING and ELECTROFORMING
• 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)
• Acid Copper Plating Problems (July 10)
• Bleed-out from seams after zinc plating (July 9) open Q.
• 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.
• Required thickness of tin plating for copper drinking water tank (June 30) open Q.
• Fingerprint stains & corrosion, on chromated zinc plated steel surfaces (June 28) open Q.
• Parts w/ yellow chromate losing color (June 28) open Q.
• Optimizing nickel sulfamate for high temperature electroforms (June 28) open Q.
• Nickel plating / striking of stainless steel (June 27)
• Soluble anodes for silver brush plating? (June 26) open Q.
• Zinc plating defects (Quality of metal finishing) (June 25) open Q.
• How to do anodes in acid tin plating (June 23) open Q.
• Zinc chloride keeps rising in zinc plating bath (June 17) open Q.
• Plating both outside AND inside of a tube (June 14)
• How to tack diamond to workpiece? (June 10) open Q.
• Black spots on parts after received by customer: fretting corrosion? (June 6) open Q.
• Problem in grinding Hard Chrome plating (June 5)
• Alkaline zinc plating problem: Black dots/spots that grow with time open Q. (June 3)
• Pits, Stain marks on Nickel Plating (June 12)
• Hard chrome plating: Temperature (May 30) open Q.
• Bright vs. dull cadmium plating (May 26) open Q.
• Tin Plating Problem: doesn't take in random areas (May 15) open Q.
• Silver plating on aluminum blisters after baking (May 12) open Q.
• Converting rhodium dip plating solution for use in pen plating (May 6) open Q.
• Suitability of Electroless Nickel for very low service temperature? (April 29) open Q.
• Copper Pyrophosphate Delaminating from Strike (April 29)
• Hard Chrome plating -- pitting in horizontally plated shaft (April 27) open Q.
• Chrome Plating Steel in a Bath Normally Used for Plating Copper (April 22) open Q.
• White Patches in Trivalent Chrome Plating (April 22)
• Nickel plating white patches and dullness (April 21)
• Black spots in zinc plating (April 16)
• Current density required for chrome plating (April 16)
• Hard Chrome Fails Salt Spray Test if it's Ground (April 15) open Q.
• Substitute/Alternate/Replacement for Rhodium Plating (April 14) open Q.
• Ingredients for chrome (April 12)
• Hard chrome plating problem: dull gray plating (April 8)
• Tin Plated Copper parts black smear/residue (April 8) open Q.
• Marks in tin plated copper bus bar (April 6) open Q.
• Converting zinc plating bath to zinc-nickel (March 29) open Q.
• Cyanide bleedout in Silver Plating of Brass Castings (March 27) open Q.
• Zinc plating turns black in weld area (March 26)
• Acid zinc plating is dark grey and black (March 25)
• Installing a black chrome plating plant (March 16) open Q.
• Plating chrome on a nickel substrate (March 12)
• Peel off problem from semi bright nickel (March 9)
• Help repairing chrome cylinder rods (March 8)
• White bronze plating problems (March 1) open Q.
• Zn blue passivation turns yellowish (March 1) open Q.
• Marks and hazy spots after gold plating jewelry (February 26) open Q.
• Electroplating of iron onto bismuth shot (February 26) open Q.
• White patches in Chrome Plating (February 23) open Q.
• Purplish brown discoloration of gold plating (February 23) open Q.
• Restoring gold Iridite color to diecast parts (February 21) open Q.
• Haze on Ni-Cr plating surface (February 20)
• Economical iron electroplating; How to make up ferrous sulfate solution (February 19) open Q.
• Chrome plated hydraulic cylinder rods have pits (February 15)
• Nickel plating is coming out black (February 15)
• Plating of Rare-earth Neodymium Magnets (February 12)open Q. Inquirer often helps others, so especially deserves help
• Alkaline Zinc Nickel Plating of Hardened Steels open Q. (February 9)
• Q&A: Tin plated parts turn yellowish (February 4)
• What types of plating can be done in a barrel? open Q. (January 30)
• Zinc electroplating with yellow passivation is dull open Q. (January 30)
• My brass plating is nickel color instead of yellow open Q. (January 29)
• Zinc-Nickel Plating is 'silver' color in Black Passivation bath open Q. (January 29)
• Tin-Silver Electroplating over Copper Pillar Bump open Q. (January 20)
• Manufacturing Process of Nickel Sulphate and Nickel Chloride (January 20)
• Black Nickel Bath Formula for Barrel Plating (January 18)
• Emissivity value for Cadmium plated steel and Zinc Plated Steel open Q. (January 16)
• Can lack of ZnCl2 additions cause chloride zinc roughness? open Q. (January 12)
• Hard Chrome Plating Additives? HEEF Advantages? MSA? (January 12)
• How thick is the chromate on zinc-nickel plating? open Q. (January 11)
• How to do brass plating on stainless steel (January 11)
• How much voltage and amperage for barrel acid zinc plating? open Q. (January 11)
• Need to touch up Cadmium plate (January 6)
2d. ELECTROLESS PLATING, PLATING ON PLASTICS, IMMERSION PLATING, CHROME-LOOK SPRAYS, LIQUID METAL COATINGS
• Can Electroless Nickel Plating be Machined? (July 18) open Q.
• Formula for electroless nickel plating solution (July 2) open Q.
• Sandblast before Electroless Nickel plating (June 25) open Q.
• No adhesion of Electroless Gold onto Sulphamate Nickel Plating (June 4) open Q.
• Poor Adhesion of Electroless nickel on Sulfamate Nickel (May 15) open Q.
• Factors affecting Electroless Nickel deposit rate (May 9) open Q.
• How to determine plating defect vs. plastic substrate defect (April 24) open Q.
• "Dot Skip" Problem in Plating of ABS Plastic (April 21)
• What is the wetting agent for silvering of vinyl LP records? (March 30) open Q.
• Thermal cycle Test on ABS (March 15) open Q.
• Chrome plating peels off of electroless nickel (March 6)
• Plating Ultem 2300 and Composite Plastics (March 6) open Q.
• Palladium activation for EN Problems & Solutions (February 22) open Q.
• Problem doing EN on stainless with only non-magnetic plating (February 10)
• Silver plating with silver nitrate open Q. (February 9)
• Nickel Plating with Boron Nitride Particles (January 22)
• Mid Electroless nickel on Brass against an 6000 series Aluminium? open Q. (January 13)
2e. PVD, CVD, ION IMPLANTATION, VACUUM PROCESSES
• Vacuum Cad plating adhesion problem on 13-8 stainless (July 17) open Q.
• PVD Setup for Surgical/Medical Tools (May 16)
• Can my jewelry line be vacuum silver plated? (May 16)
• How to get Jet Black PVD finish (March 5)
2f. GALVANIZING, ALUMINIZING, HOT TIN DIPPING
• Chrome-free galvanized pipe gets black spots (July 20) open Q.
• Chemical to Remove slag/dross of zinc from hot dip galvanizing (July 16) open Q.
• Excessive generation of dross in zinc kettle startup (July 9) open Q.
• Finish on zinc coated steel coil for prefabricated housing (July 2) open Q.
• Pimples on hot dip galvanizing (July 2)
• Prevention and removal of white rust on galvanizing (June 25) open Q.
• Black spot problem on hot dip galvanized mesh (June 23)
• Does hot dip galvanizing weaken steel? (June 23)
• Rough & lumpy low quality galvanizing (June 23)
• Welding of hot dip galvanised kettle (June 11) open Q.
• Increase existing GI coating without re-galvanizing (June 3) open Q.
• How to reduce galvalume and galvanizing dross generation (May 14) open Q.
• Wiping system for continuous wire galvanizing? open Q. (December 19)
• Sulfuric Acid Solution Recovery Q&A (April 10) open Q.
• How Can I Reduce and Remove Zinc Dross (April 6) open Q.
• Galvanising - Reduce & Recover Zinc Ash and Dross (March 18) open Q.
• Alternatives to hot dip galvanizing for a small shop (March 12)
• Titanium and Lead in hot dip galvanising (March 3) open Q.
• How do we tolerance and gauge galvanized fasteners? open Q. (February 11)
• Is galvanized steel appropriate for water/glycol mix? open Q. (February 10)
• What degreasing & flux for HDG of lighting poles? (January 26)
2g. BLACK OXIDE, BLUING, COLORING, PATINATING, NITRIDING
• Testing the quality of blackening coating (July 16)
• Black oxide solution with copper contamination (June 4) open Q.
• My caustic bluing solutions gets weak (March 10) 2nd Request open Q.
• How do you use wax coating at end of Black oxide process open Q. (February 8)
• How to make black golf putter heads? (January 30)
• Does black oxide add hardness? (January 11)
• Best Alternative to Black Oxide Finishing open Q. (January 5)
2h. OTHER INORGANIC FINISHING: Mechanical Plating, QPQ, Metal Spray, Zinc-rich Dip-Spin Coatings, Sherardizing, etc.
• Dacromet coating questions (July 23) open Q.
• Depletion Gilding, and Tarnish Prevention in low karat metals (May 24) open Q.
• Cost Estimating for S442 Zinc-rich Dip-spin Coatings (February 9)
3. ORGANIC FINISHING PROCESSES . . .
3a. ELECTROPAINT PRIMING, AUTOPHORETIC COATINGS
• Pin holes in CED e-coating (July 4) open Q.
• CED Paint conductivity is dropping/rising (June 18)
• Electrocoating: Higher or Lower Solvent for Lower DFT? (May 31) open Q.
• Which pumps & membranes are best for CED bath? (April 13) open Q.
• Defects in CED Coating (April 12)
• How to Increase DFT Paint Thickness in Cathodic Electrodeposition (CED) system? open Q. (March 28)
• Sizing an e-coating rectifier (March 9) open Q.
• Book or notes for PT CED (February 2)
3b. POWDER COATING
• Alternatives to powder coating (July 27) open Q.
• Mixing powder coating colors to get a new color (July 9) open Q.
• Touching up powder coating (July 8) open Q.
• How to Powder Coat Plastics (Nylon, ABS, Polycarbonate, Composites) (June 18) open Q.
• High heat resistance powder coating (April 22) open Q.
• The best pre-treatment process for Aluminum alloys to be Powder Coated (March 4) open Q.
• Aluminum pretreatment for powder coating (March 3) open Q.
• Surface Treatments For Aluminum Concrete Forms (January 29)
• Aqua Blasting before Powder Coating open Q. (January 8)
3c. LACQUERS, CLEAR COATS, ELECTROPHORETIC TINTING, ANTI-TARNISH
• Coatings for metal spectacle frames (July 7) open Q.
• Cathodic Electrophoretic Lacquer -- How to get matte black CED (May 21) open Q.
• Preserving bright copper using benzotriazole solution (March 14) open Q.
• Applying Colors to Nickel Plating (February 26) RFQ
• Clear coating for for exterior steel open Q. (January 22)
3d. PAINTING, PRINTING, ADHESIVES AND OTHER ORGANIC COATINGS
• Training on plastisol chemistry and application? open Q. (July 7)
• Aluminium Bitumen Paint (June 17) open Q.
• Ceramic coating formulation (June 16) open Q.
• Do we need to clean paintlok ductwork before dryfall painting? (March 4) open Q.
• Paints for power transformers (February 19) open Q.
• Epoxy bleed-out problem on matrix leadframe open Q. (February 8)
• Poor adhesion of paint to aluminum open Q. (January 27)
4a. CHEMICAL POST-TREATMENTS [CHROMATE CONVERSION COATINGS, RUST PREVENTATIVES, PATINAS, COLORIZING]
• White colored spots on chromated zinc plating (July 23)
• Prepping gravure cylinders for storage (June 16) open Q.
• How to Passivate Copper (March 22) open Q.
• Formula for Blue Chromate (Passivation) for Zinc Plating (March 4) open Q.
• Chromate conversion on cadmium not adhering (February 11)
4b. BAKING AND NON-CHEMICAL POST-TREATMENTS [HYDROGEN EMBRITTLEMENT AND DE-EMBRITTLEMENT, ANNEALING, WHISKERS, SOLDERING, REFLOWING]
• Soldering issue when using a Silver-bearing Soldering Alloy (July 9) open Q.
• Soldering Electroless Nickel plated components (June 11)
• Why Pre-Bake before cadmium plating? (April 29) open Q.
• Baked zinc plating vs. zinc without bake (February 12)
4c. STRIPPING, REWORKS, ETC.
• Stripping aluminum with caustic soda (July 27) open Q.
• Removal of tin plating from copper (July 14) open Q.
• Stripping Nickel off Stainless Steel Substrates (June 25)
• Stripping Cadmium plating and choosing a method (June 18)
• Strip paint from aluminum without stripping chromate conversion coating (May 4) open Q.
• Hard chrome appears to be immersion depositing during operation (April 28) open Q.
• Restoring fire-blackened cast brass generator brush-holders (March 11) open Q.
5. SUPPORTING ISSUES
5a. ANALYSIS, LAB TECHNIQUE, Q.A., SALT SPRAY TESTING
• Gravimetric analysis of gold plating bath (July 24)
• 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.
• Scribe marks on galvanized samples (June 15)
• Gage R&R for an XRF plating thickness tester (June 10) open Q.
• Analysis of nitric-hydrofluoric aluminum etching mixture (May 12) open Q.
• Salt spray / salt fog pH variation (May 12) open Q.
• Adhesion Tape Testing of Plating (May 2) open Q.
• Looking for a titration method for ferric chloride (April 22) open Q.
• Wood's Nickel Strike Bath Analysis & Maintenance (April 19)
• Analysis of HNO3 & HF in titanium etch (April 18) open Q.
• Interpretation of EDX spectrum result (April 17) open Q.
• Adhesion test for chromate conversion on aluminium (April 10) open Q.
• Specific gravity of water plus acid mixture? (April 5)
• Thickness measurement of plating plus paint (March 9) open Q.
• How to Analyze Total Solids in Rinse Water? (March 7) open Q.
• Q&As on Operation of ASTM B117 Salt Fog Test Chambers: The Salt Spray Woes open Q. (February 11)
• Chrome plating thickness determination open Q. (February 9)
• Test for cadmium plating open Q. (January 30)
• Lab sink set-up? How to deal with titration waste? open Q. (January 26)
• Spot check for testing for Sn on Al substrate? (January 26)
• Measuring cadmium plating thickness magnetically open Q. (January 18)
• Copper vs. stainless "Stress Tabs" for Electroless Nickel open Q. (January 16)
• Salt Spray vs. Humidity Test for Passivated Stainless Steel? open Q. (January 16)
• How to calibrate a pH meter for 0.65 and 1.3 pH range (January 10)
5b. WASTE & WASTEWATER TREATMENT, POLLUTION CONTROL
• Chromium in my Anodizing Waste? (July 18)
• Ion Exchange / DM plant calculations (July 13) open Q.
• Wastewater treatment issues: Cyanide destruction questions (June 14) open Q.
• Recycling of sodium hydroxide from aluminum etching (May 5) open Q.
• Wastewater: big spike in Carbon Disulfide open Q. (February 15)
• Biological/Algae Growth in Tin Plating Rinse Tanks (February 11)
• Waste Water Treatment of Silica top coats (January 24)
• Wastewater treatment issue: Turbidity problems open Q. (January 19)
5c. SAFETY ISSUES, EMISSIONS, TOXICITY, ENVIRONMENTAL IMPACTS
• Sick from welding galvanized steel (June 14) open Q.
• Galvanized chicken wire in popcorn maker (April 17)
• Cyanide, its uses and its dangers (April 12)
• Safety of heating chrome to 400 °C (April 8)
• Is it safe to Parkerize cast iron cookware? (March 12)
• Toxic Lead and chrome in coffee makers and espresso machines? open Q. (February 20)
• Plating Tank Disposal -- What Are the Rules (February 18) open Q.
• Cadmium and chromate toxicity/safety from aircraft bolts open Q. (February 7)
• Rhodium allergy? open Q. (February 4)
• Cause of black mark on skin open Q. (January 21)
5d. PLANT & PROCESS ENGINEERING, CONSTRUCTION
• Hard anodizing chiller sizing for 5-gallon tank (July 29)
• Tank material for hard chrome plating (July 9) RFQ
• What kind of nuts & bolts to use when building a galvanizing plant (July 5) open Q.
• Copper Bus Bar Sizing for DC low-voltage high-amperage (June 11) open Q.
• Selection of wire for wiring/racking parts (May 23) open Q.
• Rock hard scale problem in aluminum processing (May 20) open Q.
• Aluminum bright dip set-up requirements, material of construction (May 14) open Q.
• Does anodizing need explosion-proof electrics due to hydrogen evolution (May 5) open Q.
• What happens if Nitric & Sulphuric acids are mixed? (April 30) open Q.
• Problems in PVC & PVDF piping systems for sodium hypochlorite (bleach) (April 14) open Q.
• RO water causing rust in 316SS spray nozzles (March 25) open Q.
• Flow meters to be used in Tin Electroplating line (February 9)
• Looking to purchase a small zinc electroplating system (January 29)
• Cleaning/leaching a plating tank (January 19)
• Corroded Titanium Anode Baskets in Plating Tank (January 14)
5e. QUESTIONS ABOUT SOFTWARE, SPECS, BOOKS, EDUCATION, INDUSTRY STATS, ETC.
• Industry specs for powder coating thickness (July 29) open Q.
• NADCAP & NADCAP Audits (July 20) open Q.
• Meanings of plating spec abbreviations: MFCu (July 9) open Q.
• ASTM B-449 and other specs for Chromating Aluminum Q&A's (March 27) open Q.
• Testing adhesion of electroless nickel plating (March 27) open Q.
• Black oxide over cad plated NAS6604 fasteners? (March 12) open Q.
• Overview table of plating and its properties (February 21) open Q.
• Looking for a breakdown of spec.: STD3947, Fe/Zn-Fe8c4 open Q. (February 4)
• Anodized Aluminum Coating Weight Testing ASTM B137 open Q. (January 8)
5f. W...W...W...WORD OF THE WEEK
• What is Continuous Gold Plating (July 2) open Q.
• Naming a Finish from its Looks (June 25) open Q.
• What is Chemical Brightening Process Standard (June 13) open Q.
• Zintec vs. zinc electroplated CRCA steel (June 11)
• Finishing Related Basic English Terminology (May 15)
• KTL shielding spot technical term (May 12) open Q.
• What do "gZn" and "tZn" mean? (April 8) open Q.
5g. REACH, RoHS, EOL Directives; and Replacements for Cd, Pb, Cr+6, Nitric Acid & Phosphate Replacements
5h. MOSTLY METALLURGY; Heat Treatment
• How to separate copper from silver (July 13) open Q.
• Hardening EN8 & EN9 parts (June 21) open Q.
• Powdered metals (Copper) in Los Angeles, CA (March 15) RFQ
• Electroformed Nickel Bellows Annealing Process (February 23) open Q.
• Can Powder Coating Affect Heat Treatment or Weaken Aluminum? open Q. (January 12)
5i. PRECIOUS METAL RECOVERY
• Best and Easiest way to refine gold dust to get 99.9% purity (July 10) open Q.
• Does this look like PGM content particularly Rhodium? (July 9) open Q.
• Recycler asks about extracting silver with steel nails and salt? (July 7) open Q.
• Problems in recovering gold from soil (June 6) open Q.
• Purifying 'smelted computer parts' by re-smelting (June 4) open Q.
• Cleaning gold that has been burned 2nd Requestopen Q. (April 24)
• Refining of Palladium and making its salt (February 19) open Q.
• Melt old gold to make new jewelry open Q. (January 22)
6. CONSUMER, RESEARCH, & STUDENT ISSUES
6a. ARTISTS, HOBBYISTS, CAR BUFFS, HOME OWNERS, ETC.
• Need springs for Antique baby carriage (July 29)
• Is 0.05µ gold plating "good quality"? open Q. (July 29)
• Repair discolored copper awnings [Chicago] (July 27) RFQ
• 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)
• 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.
• Require Iridescent Passivation Solution (July 18) RFQ
• Problems & solutions in copper electroforming (July 12)
• Bronze plating of a 1920's funeral fan (July 9) open Q. RFQ
• 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.
• Seeking finishing suggestions on vintage receiver restoration (July 2) open Q.
• Need Gillespie Antique Restorer (June 28) open Q.
• Aluminum threads stuck, cold welded (June 27)
• Paint not sticking to Ospho (June 26) open Q.
• How can I coat for sublimation printing on a low budget? (June 22) open Q.
• Galvanized stock tanks as swimming pools (June 22) open Q.
• Chrome plating of Ford F250 grill (June 21) open Q.
• Do It Yourself Nickel Plating (June 15)
• Seeking Iridescent Paint or Powder Coating (June 6) open Q.
• Neutralizer for acid copper plating? (June 4)
• Amperage requirements for plating (June 3)
• Wagner Ware (May 31) open Q.
• Nickel Plating Brighteners: Everything to Know open Q. (May 29)
• Should I cold-galvanize, powder coat, or do both on an anchor mount (May 23) open Q.
• Cast Iron Cook Stoves: Where to find parts and how to restore (May 23) open Q.
• Base for bathroom faucets is corroded and needs painting (April 30) open Q.
• Change my white gold ring to yellow gold (April 26)
• How to tell hard anodizing from regular? (April 26) open Q.
• Plating the inside of a gas tank (April 25) open Q.
• Acrylic Tub Damaged by Drain Cleaner (April 22)
• Gold Plating of Fancy Bathroom Fixtures (April 22) open Q.
• Making a dark black watch dial (April 20) open Q.
• Home nickel plating with vinegar and salt (April 17)
• Can nickel plating fill pit and scratches (April 14)
• Design Project: Recycling Copper through Electroforming/Plating (April 10) open Q.
• F.B. Rogers Item -- What Is It? (April 8)
• How to turn copper aesthetically green (April 7)
• Tea Service: Sterling or Silverplate? (April 1)
• Help, my yellow brass turned pink (March 26)
• Clear coating of Silver for Anti-tarnish (March 25) open Q.
• Steel vs. aluminum patio furniture: corrosion resistance? (March 24) open Q.
• Artistic painting with anodizing (March 18) open Q.
• Gluing to Polypropylene? (March 10) open Q.
• Green fingers from gold rings (March 7)
• Mystery patina on copper electroforms (March 5)
• Zinc electroplating for hobbyists and school projects open Q. (March 4)
• How to tint headlight metalizing? (March 3) open Q.
• How to make Pewter Shiny? (February 26)
• Need Dupont Lucite Acrylic Lacquer paint (February 25)
• Replating of barber chairs (February 23)
• Silver Plating turning pink (February 23) open Q.
• What chemical will heat water to melt ice? (February 22) open Q.
• Removal of clearcoat on copper (February 15)
• Trying to make Nickel Acetate D-I-Y (February 14)
• Restore/repair black porcelain sink finish (February 8)
• Paint removal in corners of wood door (February 1)
• Copper Plating from an Ammonia Solution (January 31)
• Preparing acid copper brightener (January 30)
• Zincate formulas for plating on aluminum open Q. (January 30)
• Can I do 'rusting process' on nickel plated items? open Q. (January 27)
• Removing tarnish on brass & copper open Q. (January 27)`
• How to fix pewter that turned gold color open Q. (January 20)
• Can I rubber line a bottle cooler? (January 20)
• Lacquering / clear coating a Brass Bed (January 18)
• Home Anodizing (January 18)
• Boiling water seal for home anodizing? open Q. (January 18)
• High strength fastener Q&A's, Issues & Answers open Q. (January 16)
• Paint/powder coat Aluminum Wheelchair Q&A's (January 14)
• Stripping a faucet down to raw brass open Q. (January 13)
• How to clean Birds in Flight metal sculpture open Q. (January 13)
• Pre-coating for sublimation transfers onto ceramic (January 11)
• How to electroplate Aluminum onto Aluminum (January 10)
• Yellow Chromate Adhesion Problem (January 6)
• Rash from Ring? Fixed by Boiling in Vinegar & Peroxide! (January 5)
• Restoring the dark brown finish to copper sinks (January 4)
• How to Blue / Blacken Brass open Q. (January 3)
6b. RESEARCH, THESIS TOPICS, UNIVERSITY & POST-GRAD STUDENTS
• Teflon coating of stainless steel (July 26)
• How to electrodeposit PbO2 (lead dioxide) (July 25) open Q.
• History of iron electroplating (July 19)
• When to replace magnesium electropolishing solution, or how to analyze? open Q. (July 7)
• High strength bolt testing (April 20) open Q.
• How to make Zinc Chloride (February 21) open Q.
• Electroforming of Copper Foil open Q. (January 10)
• Teflon coating of stainless steel open Q. (January 2)
6c. K-12 SCIENCE PROJECTS, GRAMMAR & HIGH SCHOOL STUDENT QUESTIONS
• Building a really cheap electric arc furnace (July 12) open Q.
• Science Project: White Precipitate in Copper Plating? (February 22) open Q.
• Science project on the effect of SALT & WATER on steel wool (February 4)
7. DRIFTED OFF FINISHING, BUT INTERESTING TO SOME OF US :-)
• Hazmat transportation requirements & exclusions (July 21)
• Drawn platinum wire as a hinge pin on bracelets & earrings (July 15) open Q.
• Markings indicating real gold on jewelry (July 12) open Q.
• Identifying rings: Marking system for rings (July 7) open Q.
• How to Fix mercury damage to gold jewelry (June 21)
• Fiction stories involving plating (June 18)
• Hoyt Metal Ingot. What type of metal do I have? (June 16)
• Taking antique brass bed apart (June 11) open Q.
• Zinc oxide production by French process (June 6)
• How to do bottle cap tables and bartops with pourable epoxy (May 21) open Q.
• Stiffel lamps: How to repair Q&A's (May 11) open Q.
• Need sweet spirits of nitre (May 6)
• Hydrolysis and HHO hydrogen energy for cars (April 16)
• Cleaning Dirilyte Gold-tone Flatware (April 16)
• Silver extraction from waste hypo/fixer solution (April 16) open Q.
• Ceramic Tile Cleaning with muriatic acid (April 12)
• Freezer section of my fridge oozes orange goo (April 12)
• Why is Panchlok statue made of 51 grams of each metal? (April 4) open Q.
• Antique icebox Q&A's, Problems & Solutions (March 30)
• What is 'Kelite'? The Kelite Bldg. in Los Angeles (March 27) open Q.
• Maple Syrup Boiling / Evaporator Pans (February 25) open Q.
• Fix frozen zipper stuck from salt spray or corrosion (January 12)
• Mill Scale Uses and Applications open Q. (January 5)