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topic 3484

Turning hard anodising black


Can we put an additive or dye in our hard anodizing bath to make the components come out black? If so what do we use? We find the green / olive colour varies too much with the different grades of aluminium.

Martin McElwee
New Zealand

No. 1 of 3 simultaneous responses--


We often dye our hardcoat anodize black. It is not done in the hardcoat anodize bath. The dyeing is done as a post treatment just like in normal Type II anodize.

David A. Kraft
- Long Island City, New York

No. 2 of 3 simultaneous responses--


A full thickness (50um or 2mil) low temperature (0C or 32F) hardcoat should be consistently dark. Hot tanks and/or thinner coatings will produce lighter and more variable anodized coatings. They can be dyed black, however, these coatings may not meet your customer's wear and corrosion requirements if they expect a conventional hardcoat.

Chris Jurey, Past-President IHAA
Luke Engineering & Mfg. Co. Inc.
supporting advertiser
International Hard Anodizing Association - Wadsworth, Ohio

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No. 3 of 3 simultaneous responses--


Greetings Martin, There is of course a way to do this, but it doesn't involve addition of anything to your hardcoat anodizing bath, its just a standard black dye that can be purchased (from here in the states at least) from 3 manufacturers that I know of.

Matthew Stiltner
plating company - Toledo, Ohio

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