Summary for fair 9102 chromating anodizing Discussion
FAIR 9102 and the surface-treatment callout are the main issue here: the drawing listed MIL-C-5541, Class 3, passivation with Surtec 650, and black anodized, and the question was whether that was enough to describe the process for a First Article Inspection Report. The poster also noted that the parts are mostly black anodized, with only some areas masked for electrical contact, and asked whether the newer MIL-DTL-5541 should be used instead of the older MIL-C-5541. Ted Mooney said he had no experience with FAIR and could not say exactly what belongs on the form, but advised not to change paperwork unnecessarily and to start with MIL-DTL-5541. John Hatfield added that most U.S. FAI parts require the latest revision, and said his company uses MIL-DTL-5541F on paperwork; he also noted that Surtec 650 is proprietary and has replaced Alodine 600, though some customers want the exact product listed on the cert.
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FAIR = First article inspection report
Q. Hello ,
Our customer stated the surface treatment as followed on the drawing:
MIL-C-5541, Class 3 – passivation with surtec 650, black anodized.
The parts are almost completely black anodized and only some areas are masked for electrical contact.
As we have to do a FAIR 9102 (AS 9102) my question is if the above mentioned MIL is sufficient to specify the treatments.
For my understanding the parts will be chromated and than masked and black anodized to get the final result.
For black anodizing MIL-A-8625
[⇦ this spec on DLA], Type II, Class 2, black is normally used do we have to add this to the drawing or is 5541 sufficient?
Thanks for your help.
Xzibi Hatle
– Hamburg Germany
December 19, 2022
A. Hi Xzibi,
Chromate conversion coating and anodizing are totally separate processes; so, while specifying MIL-C-5541 gives a standard to follow for the chromate conversion coating, it says nothing about the anodizing. I think you most definitely must add “per Mil-A-8625 Type II, Class 2” after “Black anodized”.
I have no experience with FAIR but am under the impression that it requires quite a bit of detail in the sequence of operations.
Luck & Regards,
Ted Mooney, P.E. RET
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finishing.com – Pine Beach, New Jersey
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Q. Hi Ted,
Thanks for your feedback, much appreciated . From my research I found that also the MIL-C-5541 is now MIL-DTL-5541 as the customer wants Surtec 650 I guess we should also refer to the newest norm?
Xzibi Hatle [returning]
– Hamburg Germany
December 20, 2022
A. Hi again. I have no experience with FAIR and can’t advise exactly what should go on the forms, but you don’t want to change them unnecessarily. So, you probably should start with MIL-DTL-5541
[⇦ this spec on DLA] rather than an outdated spec.
Surtec 650 is a proprietary rather than a generic process, but a customer can certainly specify a proprietary if they wish.
Luck & Regards,
Ted Mooney, P.E. RET
Striving to live Aloha
finishing.com – Pine Beach, New Jersey
Need quick confidential answers? $25
Need project assistance? $100/hr.
A. Most FAI parts in the US require the latest rev be used. In this case, MIL-DTL-5541F is what we put on our paperwork.
As Ted said, Surtec 650 is proprietary. It has taken the place of Alodine 600. I have some clients that require us to list the exact product info on the cert, some do not.
John Hatfield
– Vonore, Tennessee
January 19, 2024