Letter 4062

Nitric Acid? 

-

Can anyone tell me why a nitric acid bath is nessessary in the alluminum anodizing process?

chris - hampton va

It is not "necessary", it is a readily available cheap desmut chemical. Proprietary desmut/deoxidize chemicals are available, but at a higher cost. Most of them work better because they do two functions.

Probably the most effective deoxidize desmut is a mixture of sulfuric/nitric/ammonium biflouride. Effective, but slightly nasty.

James Watts - FL

What mixture ratio do you mix -mixture of sulfuric/nitric/ammonium biflouride- to make the desmutter and deoxidizer and where is the best place to buy these chemicals?

Roy Clarkson
- Rock Hill, SC, USA

It's best to buy a proprietary desmutter from an aluminum pretreatment specialist like Chemetall-Oakite, Macdermid, Nalco, Southern Industrial Chemicals, or U.S. Specialty Chemical.

Ted Mooney, P.E.  finishing.com Brick, NJ

 

I want to post a question on a different subject.

 

I want to answer or follow-up on this question publicly