Letter 3032

Chromate in Chemical Conversions on Aluminum 

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I am looking for a MIL and/or industry spec that covers the chromate (specifically clear and yellow) in chemical conversion coatings on aluminum. Initially I thought it was covered in Mil-C-5541 [link is to spec at TechStreet]E, but on reading it I did not see a referance to any chromate. Am I missing something?

John Barrows
- Alphretta, GA

The MIL-C-5541 part is correct; but...

  • for the required properties of the chemicals to accomplish it, see MIL-C-81706
  • for a list of qualified commercial products see QPL-81706.


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

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