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Sound technical content, curated with aloha by
Ted Mooney, P.E. RET
Pine Beach, NJ

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Dissimilar Metals

Q. My questions is concerning corrosion due to contact between two dissimilar metals. I have an extruded alum. tube 6063-T5 and some structural steel tubing. The alum. is painted with a 2-part polyurethane paint. What type of material should be placed between the two dissimilar materials to help prevent electrolytic corrosion? The alum is used as an architectural feature in a commercial building and the steel is needed for structural support.

Any advise would be greatly appreciated.

Rafael Rivero
- Corona, California
2001

A. This is a common problem in aerospace where cadmium is used. For commercial work I would suggest galvanising, which would also give good corrosion protection.

Martin Trigg-Hogarth
surface treatment shop - Stroud, Glos, England
2001

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