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topic 0703

Inhibitors for sulfuric acid anodizing


Dear Sirs:
I am currently working on anodizing diecast aluminum, LM5 or Al-Mg alloy, parts. Known from The Surface Treatment & Finishing of Aluminum and its Alloys by S. Wernick, R. Pinner, P.G. Sheasby that different metallic compounds' solubilities in aluminum alloy matrix are different in sulphuric acid during anodic process, so inhibitor should be used or else the texture outcome will be unsatisfied.

I would like to know what inhibitor or any brand name type is available in the market.

Thank you!
Best regards,

Wang W [last name deleted for privacy by Editor]
National Cheng Kung University - Taiwan

Hi, Wang. The book you referenced describes additions of oxalic acid, glycolic acid and some other materials. Any of the companies selling anodizing processes and technology can offer proprietary additives. Good luck.


Ted Mooney, Teds signature
Ted Mooney, P.E.
Pine Beach, New Jersey

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