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Finish for aluminum busbar in contact with silver plated copper busbar

I am looking for appropriate finish for an aluminum busbar bolted to a silver plated copper busbar.

Application is 500 Amps, computer room environment.

Should I use a class 3 MIL-C-5541E chromate or MIL-T-10727C type I tin plate?

Should my silver plated copper busbar be tin plated?

Thanks in advance.

Dave Gilley
Engineer - Canton, Massachusetts
2007

At the least, the contact areas of aluminum bus must be electroplated; chromating will not do. Because the copper is already silver plated, I think you should have the aluminum silver plated.

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
2007

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