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MIL-C-5541 class 1A

2004

I have piece parts coated as MIL-C-5541 Class 1A and it always be seriously scratched, so please help If surface hardness and color difference are strictly specified in MIL-C-5541?

Thanks,

Roger Yu
product engineer - Qingdao, Shandong, China

Chromate conversion coatings for MIL-C 5541 have healing properties enough to migrate over small scratches, but not large ones or abrasions. Abraded and scratched aluminum can be re-coated with the chromate by "brush on" techniques. Electroless nickel will protect against scratches. This is a hard deposit and protective of aluminum.

Don Baudrand
Consultant - Poulsbo, Washington
(Don is co-author of "Plating on Plastics"
and "Plating ABS Plastics" eBay or AbeBooks affil links])
2004

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