Category: "Anodizing and light metal treatments (Aluminum, Magnesium)"

617/89. Removing calcium & zinc from rinse water on aluminum anodizing line Inquirer often helps others, so especially deserves our help - 1/24/25

432/48. "Two-step" black anodizing w/tin sulphate: Q&A - 12/21/24

617/87. Anodizing: missed one tapped hole; how to re-do? - 12/18/24

137/75. How to Chromate Conversion Coat ADC12 - 12/7/24

295/19. How to Mask for Hardcoat Anodize - 12/4/24

613/75. Chromate Conversion Coating as Paint/Powder Prep - 12/3/24

415/31. Ultrasonic cleaning of anodizing leaves white stain 2nd Rqst - 12/3/24

533/57. Slime/algae on surface of anodizing tank - 11/27/24

617/74. Anodizing: Small Area That Doesn't Dye - November 23

617/70. Simultaneous etch-passivation solution for aluminium pretreatment - November 18

144/62. Spot type seal check for black anodized aluminum - November 14

617/64. Skin products affecting dyed anodizing? - November 1

338/83. Problems in Plating on Aluminum (ADC12) - October 30

617/62. Delay between Aluminum Chromate & Powder Coating - October 24

617/44. Black Anodize Blemishes & Spots - October 14

617/51. Problem dying anodized aluminum green - October 11

617/37. Is Discoloration an Etching Problem? - October 11

617/26. Black dust on dyed black anodized aluminium - September 28

279/90. Anodizing is Flaking Off of 7075 Aluminum Parts - September 28

600/68. Aluminum sheet shows stripes after chromate conversion coating - September 23

617/36. Affect of water on 6061 anodized aluminum - September 21

617/41. Aluminum certified as the same etches differently - September 18

242/36. Epoxy primer not adhering to conversion coated aluminum (failing bend test) - September 9

515/73. Anodizing rectifier & chiller sizing - August 28

423/62. What were the two types in the old Mil-C-5541 spec? - August 27

617/16. Odd porosity on anodized threads AFTER sealing - August 26

434/84. Low Anodizing Thickness in Gap between Plates - August 26

615/29. Anodized Aluminium edges not taking dye very well - August 12

  67/84. Need 0.5 Ra after Anodizing - August 6

400/35. Desmut can't remove black coloration from etching - August 5

616/99. Alloy wheels: is chrome plating or anodizing better? - August 1

34822. Temperature limit for chromate conversion coating on aluminum - July 25

61690. Improve Labeling Process on Anodized Aluminum - July 25

61689. Current Density for Electropolishing Aluminium - July 24

61688. Best pretreatment for tin plating on aluminum? - July 24

61687. Chemical No. 21 Ferric Nitrate Bright Pickle of Magnesium - July 24

36275. Sandblasting aluminum parts prior to Alodine coating - July 24

30512. Best Sulphuric Acid Concentration & Influence on 720 Rule - July 15

61674. Some Black Anodizing Came Out Blue - July 4

61239. Dye keeps flaking off along with some of the anodize - July 1

14851. Salt Spray Results vs. Panel Preparation - June 19

56581. Rainbow effect / defect on anodized aluminum? - June 15

  1594. Eliminate stray currents in stainless seal tank - June 5

36556. Coatings on Aluminum for Electrical Insulation - June 4

61653. Shot Peening & Anodization to Maximize Fatigue & Corrosion Resistance of 6082-T6 - May 30

44778. Hard Anodizing Defects: stains on brand new Kawasaki forks - May 27

616/73. Brite Dip & Anodizing on sandblasted aluminium shows white spots/blooms - May 25

61656. DI Water is Etching Anodized Aluminum in the Cleaning Line - May 20

  9519. Plating on Aluminum Q&A - May 3

61664. Magnesium corrosion with TCP treatment - May 3

41531. Cleaning anodized parts with acetone and ultrasonics stains them - April 14

48664. Wet Tape Adhesion Test per MIL-DTL-5541 - April 3

37317. Hexavalent chrome in surface of chromic acid anodized parts - March 21

61636. Black Marks on Extruded Aluminum I-Beams - March 20

  9142. High Thermal Emissivity for Aluminum Electronics Boxes - March 19

56977. Mirror polishing thin aluminum sheet on both sides without warping - March 10

26894. Problems in cold sealing of anodized aluminum - March 2

61637. Halo spot in Hard Coating 6061-T6 Aluminum - February 22

43248. Two-step" black anodizing has reddish powder on it - February 19

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

61639. White patches only when anodizing 60xx - February 19

  3437. Anode to Cathode Ratio, Size, Spacing, Placement in Anodizing - February 12

61633. Methods for evaluating surface preparation steps during the anodizing process - January 29

43777. White spotting on black (and red) anodising - January 11

59981. Calculating required aluminum anodizing time - January 11

53012. Electrolytic Etching of Aluminum - January 10

  4422. Aluminum Anodizing Color Match Problems

14441. White spots in black anodizing

61610. Large Plate anodizing problems - December 27

61623. Contaminant Build up in Anodize Line Rinse Tanks

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

36602. Black rubs off anodized parts - November 25

33883. Problems in Plating on Aluminum, including alloy selection - November 21

21693. Sealing Aluminum to prevent oxidation? - November 9

61589. Snowflake corrosion on Duranodic anodized parts - October 25

47152. Dissolving aluminum with caustic soda - October 24

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

56514. Minimum time between chem-film and priming - October 22

14122. Re-anodizing Aluminum which has been previously anodized - October 19

37104. Trying to mild etch High Mg Al alloy

  0606. Water quality / chloride contamination in anodizing

22496. De-smutting/De-Oxidizing of aluminum - October 3

• Teflon Coating on Aluminum

• Anodizing supplier is RoHS compliant but not RoHS certified?

• Looking to permanently whiten aluminum

• Failed Taber testing on hard anodizing

• Two-step black color anodizing Q&A, Problems & Solutions

• Dissolving aluminum with caustic soda - September 15

• Reduce anodize thickness by leaving in tank with power off? - September 14

• Chromate Conversion Coating of Cast Aluminum: Problems & Solutions

• Gold hard anodising with anti-bacterial silver

• I need to to know exact chemical composition for MIL-DTL 5541 conversion coatings - September 1

• Caustic Etch Analysis -- aluminium anodizing

• Calculations & formula to reach 25 micron [0.001"] anodizing thickness

• Preventing yellow/tan discoloration of molded aluminum

• Black spots problem in anodized aluminum - August 15

• Will black anodized chassis dissipate heat better than clear

• Zincate formulas for plating on aluminum

• Can sealant surfactants be removed? - June 30

• Coating mass/weight for ASTM B449 colorless - June 29 Inquirer often helps others, so especially deserves our help

• Aluminum Anodizing Color Match Problems - June 25

• Alodine 1200 is now coming out clear instead of dark - June 25

• Anodized aluminum refuses to dye - June 25

• Want very thin Anodizing on Aluminum

• Anodized Aluminium edges not taking dye very well

• Need black anodizing that is UV-proof - June 9

• Alodine is too dark! - June 8

• Sandblasting of aluminum diecastings - June 8

• Not very successful yet at anodizing - June 8

• Alkaline Etching Bath gets used up really fast - June 8

• Need 'perfect' yellow chromate conversion coating - June 8

• Zinc-nickel plating on aluminum Q&A, Problems & Solutions - June 8

• Crazing/cracking of anodizing from baking powder coating - June 2

• Looking for lab for corrosion testing of MIL-DTL-5541 samples RFQ: Jacksonville, FL - May 22

• Electrical Resistance/Conductivity Testing of MIL DTL-5541 Chromate

• Aluminium Wire Rod Surface Problem

• Corrosion of anodized 7075 T73 vs 7075 T6 aluminum

• Touching up anodizing with Alodine/Iridite/Chem-film/Chromate

• Customer wants bright black anodizing on ADC12 - April 14

• Problems achieving shiny/glossy anodizing - March 23

• "Neutralizing" sulfuric anodizing solution with nitric acid - March 5

• Bulk anodizing for aerospace

• Bright dip stains the aluminum with grain pattern - March 1

• Roller for adhesion test for chromate conversion coating - February 26

• Problems in cold sealing of anodized aluminum - February 25

• Bending aluminum: best alloys and lubricants

• Aluminum anodizing: Constant current vs. controlling the voltage - January 11

• Thickness of Alodine/Iridite/Chemfilm on Aluminum - January 3

• MIL-DTL-5541 Chem film fails humidity test - January 2

• Burning problem in Hard Anodizing of Aluminum

• Anodising thickness not being achieved - December 31

• Aluminum Anodizing Color Match Problems - December 22

• Anodizing Discolorization "Leopard Spots" - December 21

• MIL-C5541-Class 3 Question - December 20

• Chromic Acid Anodizing: Parts are too dark

• Stains in Electrocolouring of aluminum - December 6

• Pitting and black spots during Anodizing - November 27

• Chromic acid anodizing wasn't sealed. What now?

• Problem anodizing 7075 (7xxx) aluminum

• Iridite 14-2 pH Wipe Test

• Can duplex sealing enhance black dye stability? - November 15

• Need Chromating on Aluminium Castings for SST of 400 hours RFQ Pune, India - November 8

• Anodised aluminium temperature resistance - November 3

• Three-in-one aluminum pretreatment process? - October 27

• Type III hard anodize parts burning at the bottom of rack

• Need Screws for Anodizing Racking RFQ Bay Area CA - October 22

• Process flow for silver plating on aluminium - October 15

• Certification of Sulfuric Acid Anodizing voltage

• White spots on 2000/7000 series aluminum only after sealing - October 11

• Problems in cold sealing of anodized aluminum profiles - October 10

• Type III hard anodizing and Taber Abrasion testing - October 10

Inconsistent colour change in anodising; grainy & uneven color - October 8

• "Clear" Anodize on 6061 is Champagne, not Clear

• Need Bulk Anodising Service (or Setup) RFQ: Hungary - September 22

• Anodize Aluminum Nickel Bronze? Thanks! Resolved :-) - September 20

• Anodized aluminum in deionized water - September 16

• Anodizing for Electrical Resistance / Dielectric

• Aluminium corrosion and sodium stannate

• Anodizing current stuck at 1/4 of what it should be

• Tin plating on Aluminum -- is intermediate layer of copper needed?

• Alkaline etch of aluminium prior to powder coating Thanks! Resolved :-) - July 27

• Anodizing on reflectors

• Spalling of sulfuric acid anodizing

• Remove dye but not electrocoloring from anodized aluminum

White Powder/Salts on Anodized Aluminum

• 7075-T6 Poor anodising appearance related to minor differences in composition? - June 23

• Need Phosphoric acid anodize ASTM D9399 RFQ: Thailand - June 17

• Discoloration of MIL-5541 Alodine - June 13

• Can chem-film resist ultrasonic cleaning? - June 12

• Problems with Alodine/Iridite/Chem-film and Blind Holes - June 9

• Salt spray test hours for anodized aluminum - June 3

• Aluminum Alloy Rotogravure Cylinder Problems & Solutions

• Constant voltage anodizing issue: Current out is higher than current in

• Extend Alkaline etching bath life by decanting?

• Burning problem in Hard Anodizing of Aluminum - May 26

• White spotting on black anodising - May 25

• Black spots on anodized surfaces - May 25

• Conversion Coating Process (Chromating?) for Mazak (Zamak)

• Using titanium baskets & scrap aluminum wire as anodizing cathode?

• Issues black anodizing & clear anodizing sandwich panels

• Can't Get Anodized Aluminum Watch Dials Blue Enough - May 13

• Need anodizing theory Thanks! Resolved :-) - May 12

• Problem in shiny anodized product - May 4

• Blueish discoloration on hard anodized parts17

• Black spots on aluminum from anodizing

• Dissolving aluminum with caustic soda - April 8

• Current drop during anodizing - April 7

• Stains on 6061 Aluminum

• Thickness/weight of anodize coatings Thanks! Resolved :-) - April 4

• Chromic Acid Anodizing: Introduction and Problems & Solutions - March 29

• Phosphoric Acid Anodizing (PAA) current & thickness issues - March 17

• Pitting Defect on Bright Finished Aluminium Extrusion

• Setup and startup of a new anodizing line - March 16

• Hardcoating Of Cast Aluminum (ADC12)

• Black anodized parts feel like a chalkboard Thanks! Resolved :-) - March 8

• Anodizing Cast Aluminum - March 6

• Chromate not properly coating 5052 alloy

• Two-color anodizing - February 20

• Anodizing amperage drops to zero - February 20

• How to do printing onto Anodized Aluminum

• Chemfilm & hard anodize on mic 8 aluminum - February 17

• Chromic acid is being dragged into black dye tank (February 15)

• Electrocolouring of anodized aluminum: speckles & white powder stains

• Electroplating / Electrodeposition of Aluminum (February 11)

• Masking/stripping when chromate conversion and anodizing on same part

• Need world-class re-anodizing of a large sculpture RFQ Hudson NY (February 9)

• Anodizing and electroless nickel on same piece (February 2)