No registration or passwords; no pop-up ads -- only answers, aloha, & fun

Home /
T.O.C.
FAQs
 
Good
Books
Ref.
Libr.
Advertise
 
Help
Wanted
Current
Q&A's
Search 🔍
the Site
finishing.com -- The Home Page of the Finishing Industry

The HOTLINE (Q&A forum)

pub     Where the world gathers for
plating, anodizing, & finishing Q&As since 1989



C
A
T
E
G
O
R
I
E
S

  Click/tap ↓ to jump to a category, or just scroll on down --

 0. Choosing a Finish (corrosion, compatibility)
  1. Preparing the part (mech. prepchem. pretreatmasking & racking)
    2. Metallic Finishing (stainless & titaniumanodizing & light metalselectroplatingelectroless platingPVD & vacuum processesgalvanizingbluing/black oxideother inorganic processes)
      3. Organic Finishing (CED, electrocoatpowder coatinglacquers, clearcoatspainting, printing, adhesives)
        4. Post-treatments (chemical post-treatsbaking, soldering, dryingstripping & reworks)
          5. Supporting Issues (analysis, lab, QA/QCwater & wastesafety, emissionsplant/process engrg.specs, books, statslingometallurgyprecious metal recovery)

            6. NON-industrial (hobbyists, DIY, around homeresearch, thesisK-12 scienceArtists' Corner)
              7. NOT Metal Finishing (off topic but interesting)

   or Post a Question or RFQ of your own


0. Choosing a finish, corrosion

• Galvanic Action between Galvanized and Stainless Steel? - February 8

37526-4i Want gold colored finishes without use of gold - February 5

• Salt spray or CASS hours for electrophoretic lacquer on PVD on nickel plating - January 24

• Options for using tin plated terminals above the rated temperature? open Q. - January 18

• Which coating is suitable to 1440 hrs SST open Q. - January 17

• Need to know steel mill that produces Corten Steel open Q. - January 10

616181i White flow marks caused by new PT line - January 5

61584i How to Achieve Zinc Rainbow Patina - October 15

• How to restore mirror finish on stainless steel - October 4

• What ferrous material is fully resistant to hydrochloric acid? - September 28

See more threads in this category



1. Preparation

1a. MECH PREP topics: "Grinding, polishing, vibratory finishing, buffing, honing"

• Repair brushed stainless finish open Q. - October 31

6053-1i Stainless steel vibratory finishing Q&A open Q. - August 6

See more threads in this category


1b. CHEM PREP topics: "Cleaning, pickling, etching, phosphatizing, activation"

• Zinc phosphate coating is black and peels off - February 5

• Removing carbon layer from mild steel - February 2

• Electrocleaning of Nickel - January 4

• Pickling solutions for copper & brass - November 25

• How to determine whether component is zinc phosphated or manganese phosphated open Q. - November 5

• Oil Leaking on Hydraulic Pump after Pretreatment open Q. - October 24

• What chemical for matting or etching acrylic (poly methyl methacrylate) sheet? open Q. - October 14

• Manganese Phosphate coating problem on nitrided parts - October 14

See more threads in this category


1c. Capping, plugging, masking, taping


adv. maskcoat banner 

• Masking/Stop off for anodizing on complex parts - January 24

61588-1i How to mask workpiece holes in black anodizing? - November 14

• Plating of stainless steel tube damages inside surface - October 27

See more threads in this category



2. Metallic & inorganic finishes

2a. STAINLESS, TITANIUM, CORROSION-RESISTANT METALS PROCESSING

• Electropolishing and Chemical Etching Processes for Cobalt Chromium - February 5

14697-2i Chatter-like marks after electropolishing? - February 2

lewes ferry terminal railings Can T316 stainless steel be used 400 feet away from the sea? - November 9

• SS420 Pickling and Passivation Problem - October 25

• Need consultant for AMS2488 Type II Anodizing of Titanium RFQ open to all: Miami - October 19

• Passivation for type 420SS stainless - October 15

• Citric Acid vs. Nitric Acid Passivation - October 3

See more threads in this category



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

• Two-step" black anodizing has reddish powder on it open Q. - February 19

61637-1i Halo spot in Hard Coating 6061-T6 Aluminum - February 19

61626-1i Trouble with Iridite 14-2 only on 2024 - February 19

61639-1i White patches only when anodizing 60xx open Q. - February 19

51573-1 Hard anodizing chiller sizing - February 15

61636-1i Black Marks on Extruded Aluminum I-Beams open Q. - February 14

• Anode to Cathode Ratio, Size, Spacing, Placement in Anodizing - February 12

• Dye keeps flaking off along with some of the anodize open Q. - February 2

• Methods for evaluating surface preparation steps during the anodizing process open Q. - January 29

44778-6i Hard Anodizing Defects: stains, flow marks - January 27

• White spotting on black (and red) anodising open Q. - January 11

• Calculating required aluminum anodizing time - January 11

• Electrolytic Etching of Aluminum open Q. - January 10

4422-4i Aluminum Anodizing Color Match Problems open Q. - December 30

14441-3i White spots in black anodizing open Q. - December 29

61623-1i Contaminant Build up in Anodize Line Rinse Tanks open Q. - December 13

6326-3i Hard anodized parts are matte & dull; should be smooth & shiny - December 11

36602-1i Black rubs off anodized parts - November 25

• Problems in Plating on Aluminum, including alloy selection - November 21

61610-1i Large Plate anodizing problems open Q. - November 21

• Sealing Aluminum to prevent oxidation? - November 9

• Problems in cold sealing of anodized aluminum - November 9

• Snowflake corrosion on Duranodic anodized parts - October 25

• Dissolving aluminum with caustic soda - October 24

61581-1i Black anodize gets white stains only on large sheets - October 22

• Minimum time between chem-film and priming - October 22

• Re-anodizing Aluminum which has been previously anodized - October 19

• Trying to mild etch High Mg Al alloy open Q. - October 8

• Water quality / chloride contamination in anodizing open Q. - October 5

• De-smutting/De-Oxidizing of aluminum - October 3

See more threads in this category


  

2c. ELECTROPLATING and ELECTROFORMING

• Voltage spikes and amperage drops in nickel plating - February 20

• Spotted cadmium open Q. - February 19

• Tin plate Blistering - February 19

48074i Hard chrome plating problems - February 19

• Zinc plate steel wire then draw it, or draw it then plate it? open Q. - February 19

• Zinc Plating has white & red rust without a cause - February 19

• Expired Lead Frame effect on Plating Quality open Q. - February 2

9144-7i Scratches on Hydraulic Cylinders: Mechanical Damage or Plating Defects? - February 1

• Alkaline zinc plating thickness - January 24

61621-1i Blue spot/growth on a silver plated component open Q. - December 13

• Surface Area Calculations for Rough Castings - January 4

• Problems copper plating gravure cylinders open Q. - December 31

• The Role of Sulphuric Acid in Copper Plating - December 30

• Silver Plating brighteners Q&A open Q. - December 22

• Formula or recipe of Zinc brightener - December 18

• Removing discoloration patches from nickel plated brass - December 13

• Repair of hard chromium plated parts open Q. - December 11

50709-1i Acid Zinc Plating turns gray in 3 months - December 9

• Brass Hull Test Panel Cathode Cleaning - December 8

61563-3i Silver plating with Auxiliary Anodes - December 8

• Is Flash Gold / Colour Gold long lasting? - December 7

• Need silver plating on 13K per year 2" dia x 73" long aluminum bars RFQ open to all: Jackson, MS - December 6

61615-1i Zinc plating with blue passivation is yellowish at holes open Q. - December 2

• Adhesion No Good for Nickel Plating on Neodymium open Q. - December 1

• Zn25 vs ZnNi12 - Expected lifetime for marine indoors open Q. - November 27

• Zinc-Nickel Plating and Chromating Problems & Solutions open Q. - November 21

• Carbon treating silver plating solution with activated carbon cartridges open Q. - November 21

• Roughness in copper-nickel plating on zamak - November 13

• Tin Plated Parts are Turning Black open Q. - November 11

• Cadmium Cyanide adhesion issue open Q. - November 8

• Chrome plating and coefficient of expansion - November 8

• Want to find an alternative chrome plating process - November 1

• Zinc plating thickness vs. salt spray resistance - October 26

• Unusual behaviour of thief wire in chrome plating open Q. - October 25

• Chrome plated engine valves nodular and peeled in one area open Q. - October 23

• Brass plating is tarnishing and turning black open Q. - October 22

• Black Passivation and Black Trivalent Plating - October 22

• Black stain spots in satin chrome, plus burning open Q. - October 22

43916-2 Cyanide spots and stains in brass plating - October 15

• Facing issues with air locks! - October 14

9144-4i Chrome rods on hydraulic cylinders show lateral lines ... mechanically induced? - October 14

• Zinc-Nickel Plating very thin in some area of padbolts open Q. - October 14

• It takes an hour to zinc barrel plate in ammonia chloride open Q. - October 11

0350-1i How to electroplate onto Tungsten-Carbide open Q. - October 11

• Do We Use DuNuöy Ring or Wilhelmy Plate Tensiometer for Chromic Acid? open Q. - October 8

49988-4i What are these crystals on cadmium plated parts? - October 7

See more threads in this category


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

• Electroless copper plating onto wax - November 25

• Best Bright Chrome effect paint for polystyrene plastic open Q. - November 2 vipInquirer often helps others, so especially deserves our help

• Random parts are not plating completely in electroless nickel open Q. - October 22

• Conductive paint for plating on plastic, flowers, glass, non-conductors open Q. - October 20

• RCA test for electroless nickel open Q. - September 27

See more threads in this category



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

• Need TiN coated stainless sheets RFQ open to all: Las Vegas NV - February 20

• Red chromium by PVD sputtering? open Q. - December 19

7846-6i PVD coatings: color control Q&A's, Problems & Solutions open Q. - December 2

• Ion nitriding problem: batch with white dot colorization open Q. - September 29

• PVD coating directly on hot dip galvanized steel - September 27

• Need to pre-coat polyester fabric for PVD aluminum coating open Q. - September 18

See more threads in this category



2f. GALVANIZING, ALUMINIZING, HOT TIN DIPPING

• Cost to open a hot dip galvanizing business? - February 20

• Zinc ammonium chloride requirements for galvanizing flux - February 19

• How tough is galvanneal steel? Will it rust if the coating is penetrated? - February 5

• Top Dross is growing since we started filtering open Q. - January 17

• Need MIG or SAW Wire for Fabrication of Galvanizing kettle RFQ open to all: Gujarat, India - December 13

• Hot-Dip Galvanizing Kettle: how to build or where to buy one - December 1

• Galvanizing surface area and weight gain don't match up - September 28

46671-2i How to dull (reduce shine of) galvanized sheets & roofs - September 26

• Heating a galvanizing kettle with lead jacket open Q. - September 23

See more threads in this category



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

61635-1i Hot Black Oxide Issue- brownish-green parts and black spots/streaks - February 12

• Smut on the black oxide coatings - December 7

• Blackening gold with iodine - June 17

See more threads in this category



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

• Rust spots on pickled coil after a few days open Q. - September 1

• Sursulf Processing Q&A, Problems & Solutions open Q. - April 4



3. ORGANIC FINISHING [PAINT, POWDER COATING] . . .

3a. ELECTROPAINT PRIMING, AUTOPHORETIC COATINGS

32574-10i Dotted finish in CED (cathodic electrodeposition) open Q. - January 11

• Electrodeposition/e-coating (CED) issues & problems - December 8

49385-1i Paint ooze out in CED process open Q. - November 21

• How to Increase DFT Paint Thickness in Cathodic Electrodeposition (CED) system? - November 11

53021-1i CED E-coat air pockets/air trapping - October 2

See more threads in this category



3b. POWDER COATING

• Pinhole problems in powder coating - February 13

• L.a.b. CIELAB color issues: gloss variation, matching different finishes, etc. - February 4

61627-1i Powder Coating of "Black Annealed" CRS - January 3

• Powder Coating Failed Salt Spray Test - December 8

• Laser printing powder coated steel open Q. - November 20

• Is "pre heating" essential for powdercoating? open Q. - November 8

61576-1i Need 4 chrome wheels stripped & powder coated RFQ open to all, Pompton Lakes, NJ - October 13

See more threads in this category



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

• Solvent name for reducing the pH of electrophoretic bath open Q. - February 2

• Need longer-lasting lacquer for gold plating open Q. - September 11

See more threads in this category



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

• Plastisol & Solvent Ink Formulas & Improvements - February 5

• Painting anodized aluminum - February 1

• What is the color of the Nose Wheel Well Spin Brake Spring? open Q. - December 16

59759-1a Need "splatter" painting in trunk of '60s GM car RFQ open to all: Coeur d'Alene, ID - December 6

• How many micron thickness reduction after rub test on painted panel? open Q. - October 25

• Will paint withstand while moving a vehicle top of it open Q. - September 14

• FBE Pipeline Coating Issues open Q. - September 12

See more threads in this category



4. POST-TREATMENTS

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

• Can zinc plated parts go on for zinc phosphating? - February 4

• Verifying anti-tarnish for copper plating open Q. - January 13

• Trivalent passivation yellow or iridescent open Q. - July 29

See more threads in this category



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

• Post plate baking of EN coatings - June 25

See more threads in this category



4c. STRIPPING, REWORKS, ETC.

adv. metalx

• Stripping electrophoretic CED coatings open Q. - February 2

• Removing/Stripping Electroless Nickel Plating from Steel - December 19

• Cyanide vs. Non-Cyanide Electroless Nickel Stripper - December 4

• Plating was stripped from 4340 steel parts; no etching/pitting at the time, only days later open Q. - November 21

• Remove dried plating salts that leaked into cavities open Q. - November 8

• How to strip hard chrome at home - November 8

• Remove/strip anodizing from aluminum - October 13

See more threads in this category



5. SUPPORTING ISSUES

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

• Acceptance criteria after salt spray test - February 19

• Need lab SOPs for electroplating shop - February 16

• Is titration the best method to analyse copper content of ore? - February 5

• Determine % Nitric Acid. Titration? Conversion factor? open Q. - January 29

• Test for Type 316 vs. 304 Stainless Steel open Q. - January 9

• Analyzing acid tin baths -- bright and matte open Q. - January 9

• Salt Spray and Cyclic Corrosion Test for Assembled Parts January 4

61433-2i How to Analyze for Iron in Deox and Anodize tank? - December 4

• Hydrogen Embrittlement Test Failure open Q. - November 21

• Noüy Ring vs. Withelmy Plate Tensiometer for Chrome Surface Tension open Q. - November 9

• Water immersion test for stainless steel passivation Q&A, Problems & Solutions - October 8

• How to perform Acid MEQ of CED Bath manually? - October 8

• Analysis of ammonium nitrate in stripping solution - October 2

See more threads in this category



5b. WASTE & WASTEWATER TREATMENT, POLLUTION CONTROL

• Recovery of copper from electroforming solution - January 7

• How to treat BOD and COD in finishing wastewater - December 21

• How to deal with galvanizers waste acids open Q. - December 13 vipInquirer often helps others, so especially deserves our help

• Change Hexavalent to trivalent chrome? Chrome Reduction process - October 11

• Ion Exchange / DM plant calculations open Q. - September 6

See more threads in this category



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

• Cyanide Poisoning Issues - February 2

• Toxic Lead & chrome in coffee makers & espresso machines? - January 13

• How to remove chrome stains from hands & arms? - December 17

• Are galvanized steel tub and dish okay for my dogs to drink from? - December 17

• Danger in Cast Aluminum Cookware? open Q. - December 7

• Health issues in welding on galvanized steel - November 10

• Must silver plated parts be watched for cyanide? open Q. - September 27

• Painting galvanized stock tanks, and use as a swimming pool or hot tub? open Q. - September 7

See more threads in this category



5d. PLANT & PROCESS ENGINEERING, CONSTRUCTION

• Production of silver potassium cyanide from silver nitrate open Q. - January 23

17769-2i Long parts bend during barrel plating - November 21 vipInquirer often helps others, so especially deserves our help

• Ampacity & sizing of Aluminium busbar - November 21

• Will the low conductivity of Titanium be a problem? - October 18

• Need 20 Liter divided electroplating tank with an Anion membrane RFQ open to all, Palm Springs, CA - October 16

• Chilling of temporary anodising bath on the cheap - September 18

• Chem supplier for small biz RFQ open to all, Alpine, CA - September 15

See more threads in this category



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

• What is the meaning of MFZn1-SC open Q. - October 17

• Does MIL-C-5541 forbid a "Do Not Etch" instruction? - January 26

• FAIR 9102 Question re. Chromating & Anodizing - January 19

• Salt spray test: Organic thread coating makes plated fasteners rust open Q. - November 15

• Seeking MSDS and TDS for Novamax products - November 1

• Rectifier calibration open Q. - October 27 vipInquirer often helps others, so especially deserves our help

• DFAR prohibits "hexavalent chromium in a concentration greater than 0.1 percent" - October 19

• Verifying a Bond Path Analysis equation? open Q. - September 26

See more threads in this category



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

• Procedures QF-09-162 and QF-09-163 for nitric/chromium analysis? open Q. - February 2

• Converting "baumé" to Concentration - September 25

See more threads in this category



5g. MOSTLY METALLURGY; Heat Treatment

• How to demagnetise stainless steel? - October 18

• 316L Stainless Steel is too springy open Q. - October 16

• Sometimes in hot rolling the Mill Scale is excessive open Q. - September 12

26714-1i Yellow stains on heat treated stainless steel open Q. - September 10

See more threads in this category



5h. PRECIOUS METAL RECOVERY

• Recovery of fine floating gold open Q. - January 27

43983-16i Is this ore/rock Platinum, Palladium & Rhodium? A meteorite? open Q. - January 18

• How to separate copper from silver - January 11

54096-2i Can gold be reclaimed from old ceramic dishes with gold trim - December 14

• Recover Gold from Vintage Italian Murano Gold Infused Lamp open Q. - December 2

• Acid testing for gold, silver & precious metals open Q. - October 8

See more threads in this category



6. NON-INDUSTRIAL ISSUES

Hobbyists, DIY, Around Home

• Brass lamp seems to be brass plated copper - February 12

• Have Blue Gun, Want it Chrome appearance open Q. - February 8

4148-3i Ruined the finish on my stainless steel fridge - February 8

41214-1i Sticky surface after anodising - January 19

• How to Remove Zinc Phosphate from Frying Pan - January 18

• Remove black antiquing from my Citadel class ring open Q. - January 18

• Jewelry cleaner took finish off ring - January 7

• "Rainbowing" and "Bluing" Stainless Steel - January 7

• Bright Dipping of Brass Q&A - December 21

• Need to reapply silver / gold rims onto crystal stemware - December 21

44251-1i Removing Paint from Vintage Chandeliers & Candelabras - December 19

• Repair enamel coated steel tea kettle? open Q. - December 11

• Need Rechroming of Drum Hoops & Lugs RFQ open to all: Lufkin, TX - December 8

• Electroforming with Brass - November 27

• How to Dull Bright WW2 German Dagger open Q. - November 25

• Silver tarnishing -- is body chemistry responsible? open Q. - November 20

44569-11i F.B. Rogers Silverplate Q&A's? - November 11

• Painting cast iron fountains / restoring rusty fountains open Q. - November 10

• Wearing gold rings & jewelry turns my skin black - November 8

• Pre-coating for sublimation transfers onto ceramic open Q. - November 1

• Brass is Pink not Yellow - October 27

• Can't color Zinc/Zamac/Pot Metal gun parts open Q. - October 24

• How to Rust corrugated steel open Q. - October 24

• Removing Silica Water Stains open Q. - October 24

• Remove rust with muriatic acid (HCl / hydrochloric acid) open Q. - October 21

31806-2i Cleaning copper roofs - October 15

• Metal Gaming Chair Finish open Q. - October 14

• Washing machine broken aluminum spider arm? What coating needed? open Q. - October 14

• Need Noxon 7 Metal Polish - October 14

0023-1i Not succeeding with ultra-black Ruthenium plating open Q. - October 12

• Plating leaded stained glass open Q. - October 11

• Damaged finish on copper table open Q. - October 3

See more threads in this category



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

3795-11i Achieve uniform thickness in Cobalt-platinum electroplating - February 15

• Electroplating with copper sulphate for science project - December 26

61613-1i Electroplating on complex geometry, a microlattice structure December 4

See more threads in this category



6c. K-12 Science Projects, Grammar & High School Student Questions

• To rust and trust -- school science experiments with rust - November 21

• How Much Does a Penny Weigh? open Q. - August 18

• How to convert from v/v to w/v if specific gravity is given? - August 13

See more threads in this category



6d. The Artists' Corner

61624-1i Antique French cast metal lamp figurine is what metal? - January 13

0085-8i Copper electroforming is too red - January 4

• Hand painted art on a vehicle open Q. - September 11

49168-8i How to clean/restore C Jere metal sculpture open Q. - September 9

See more threads in this category



7. DRIFTED OFF FINISHING, BUT INTERESTING :-)

• Normal weight 2015d nickel shrunk to size of a penny open Q. - February 2

29370-37i Identifying rings/hallmarks - January 27

29370-38i Is 'P star M' ring that's marked 14K actually solid gold? - January 29

33143-13i Stiffel lamp Q&A's open Q. - January 22

• Brass Finishers in the 1800's / 19th century open Q. - January 13

• Barber Chair doesn't go up or down open Q. - December 29

• Need iron in diet -- will steel water bottles do it? - November 20

• What chemical would a master plumber use that would cause heat when in contact with water? open Q. - November 11

54890-7i Theda Sterling Silver Medals, Crosses, Jewelry Q&A - November 11

28915-1i Antique icebox Q&A's, Problems & Solutions - November 9

61601-1i Maker's mark on Spanish gothic chandelier open Q. - November 9

• Toxic effects of boric acid on feral cats open Q. - November 7

• Home Comfort Parts Needed RFQ open to all: California - October 27

• Monarch Stove Parts Needed RFQ open to all: Kentucky - October 27

• FB Rogers engraved silver plated pitcher open Q. - October 22

7278-1i Black Powder Cannons open Q. - October 17

• Boric acid, etc. for dog ear infections - October 14

• Bleach (sodium hypochlorite) attacking steel hull boat open Q. - October 7

See more threads in this category

Note: RFQs are reserved for our Supporting Advertisers for 2 weeks .
If no advertiser responds in 2 weeks the RFQ is open to all readers.


Post a Question or RFQ



About/Contact   -   Privacy Policy   -   ©1995-2024 finishing.com, Pine Beach, New Jersey, USA

If you are seeking a product or service related to finishing, please check these Directories:

 
Jobshops
Capital
Equipment
Chemicals &
Consumables
Consult'g, Train'g
& Software