Sound technical content, curated with aloha by
Ted Mooney, P.E. RET
Pine Beach, NJ
The authoritative public forum
for Metal Finishing since 1989
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MIL-C-5541 is "grainy" on heat treated aluminum
Normal non heat treated aluminum when Alodine treated has even finish if all steps are properly performed.
Why are heat treated parts "grainy" and not evenly coated when a MIL-C-5541 conversion coating process is used? T-42 heat treat. material: 2024-0 aluminum 0.63 thick heat treat to T - 42 per QQ-A-250/4, AMS2770H, AMS 2658B
QA Engineer - Itasca Illinois USA
October 5, 2011
This is very common when you heat treat the 2000's, the copper comes out of alloy, into the grain boundaries, when you come through the prep cycle, the copper falls out leaving a pit. There is nothing you can do about this problem.
Robert H Probert
Robert H Probert Technical Services
Garner, North Carolina
October 7, 2011
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Robert H Probert Robert H Probert Technical Services Garner, North Carolina October 8, 2011 Hey Robert, Mil-C-5541 is a conversion coating spec, not an anodizing spec.  Marc Green anodizer - Boise, Idaho October 11, 2011 Yeh, I caught it right after I punched in the button, thanks for clearing my confusion before it confused anyone else. Robert H Probert Robert H Probert Technical Services Garner, North Carolina October 12, 2011 |
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