Josh Miller

Re: Mil-dtl-5541

I have to get some processing done to MIL-C-5541 ty II cl-II.  I can't find anybody who is doing the type II.  I realize that MIL-DTL-5541 has superceded it, but can anybody recommend a processor capable of working to the type II?  Any help would be appreciated.

Thank you,

Josh Miller
joshmiller@aerongroup.com

DustinGebhardt

Re: Mil-dtl-5541

I see that Type II uses non-hex chromates.  However, I cannot find a Class 2.  In the 2 revisions that I have found (July 2006 and Nov 1990) they only mention Class 3 (electrical low resistance coating) and Class 1A (high protection coating).  What is class 2?

-Dustin Gebhardt,
CEF
Plating Engineer
Danaher Tool Group
Gastonia, NC

Josh Miller

Re: Mil-dtl-5541

In MIL-C-5541 rev A, there was a class 1, 2, and 3.  Class 2 went away a long time ago.  Since my drawing (GE circa 1973) calls for class 2, I'm unsure what current spec will work.  (class 2 described duration of salt spray for 2024-T3 and 7075-T6)

DustinGebhardt

Re: Mil-dtl-5541

With the attempt to eliminate hex chromates, the current spec more or less allows trivalent chromates in all applications.  The current approved trivalent chemicals work very well to give you very high salt spray hours.  I would expect that unless you need the thin coatings of Class 3, the current Class 1A stuff should work just fine.

-Dustin Gebhardt,
CEF
Plating Engineer
Danaher Tool Group
Gastonia, NC