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Galvanic corrosion of zinc plated steel bolts on aluminum parts?

March 22, 2010

I have specified steel bolts with Electrodeposited zinc ASTM B633 S.C. 2 Type 2 black finish. They are bolting together parts that are Aluminum (6061-T6) with an Anodized finish per MIL-A-8625 / MIL-PRF-8625 [on DLA] , TYPE 2, CLASS 1, NON-DYED (CLEAR). This assembly is in service outdoors.

What will be the extent of the galvanic corrosion between the plated bolts and the plated Aluminum?

Thank you

Jon Roat
mechanical designer - Rochester, New York, USA

March 30, 2010

This combination will certainly minimize the galvanic potential among the joint members. If the assembly stays reasonably dry (intermittent exposure to water, not constant immersion), then this should have acceptable performance. Don't expect zero corrosion for 30 years, though, as the general corrosion resistance of these parts/coatings will be less than that.

Toby Padfield
Automotive component supplier - Michigan, USA

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