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Touch up for black anodize?


I am looking for a simple touch-up Material, Process, etc., compatible with the black anodize per Mil-A-8625, Type III, Class 2, Dyed Black.

Boris Bayevsky
Mechanical Engineer (Not finishing industry) - Tallahassee, Florida, USA


Mil-A-8625 F allows touch-up with Alodine.
3.3.4 Touch UP (mechanical damage and contact marks). Unless otherwise specified (see 6.2), mechanically damaged areas from which the anodic coating has been removed without damage to the part may be touched up using chemical conversion materials approved on QPL-81706 for Class 1A coatings and the applicable method of application. Touch up shall apply only to inadvertent mechanical damage such as scratch marks. For Type III coatings, touch UP shall only be allowed in areas which will not be subjected to abrasion (see 6.1.1). The mechanically damaged area(s) shall not exceed 5 percent of the total anodized area of the item or touch up shall not be permitted. When specified in the contract or purchase order (see 6.2), contact marks shall be touched up using the above method required for mechanical damage.

Christopher D. Arfman
- Seattle, Washington


Christopher is right for specification requirement,. Check with your customer to see if this will be acceptable as to any appearance issues. I had second-tier anodizer (aerospace) ship parts where pits on black anodize filled in with black felt-tip marker. I was "not happy".

Douglas Hahn
aerospace - Saint Charles, Missouri

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