Letter 41052

Deoxidising after Anodising and prior to Colouring  

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I am having some difficulty colouring Anodised Aluminium and suspect I should be using a Deoxidant immediately prior to Colouring. Any suggestions for a suitable Deoxidant.

David Rean
Small batch Electroplating & Anodising - Ulladulla, N.S.W. Australia

I've never heard of that, David. Rather: pretreatment, anodize, dye, seal (with rinsing in between each step).

Ted Mooney, P.E.  finishing.com Brick, New Jersey

The nitric in the deox will 'open up' the pores and allow better dye absorption in some cases, usually castings.

Bill Grayson
metal finishing - San Jose, CA, USA

Thanks, Bill. I know of dilute nitric acid being used as a rinse aid after anodizing, supposedly displacing trapped sulfuric acid. Is this "deox" solution stronger, or is it also very dilute? Thanks.

Ted Mooney finishing.com Brick, New Jersey

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