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Can Iriditing 'Migrate' to Tin?

I am using a yellow Iridited aluminum box for an electronics enclosure. The box contacts a bright tin plated BeCu RFI gasket mounted to a nickel-silver shield (a galvanic no-no). The tin-plated gasket has taken on a yellow-ish appearance similar to that of the Iridite. The Iridite finish on the aluminum appears faded in these contact areas. Is is possible for the Iridite finish to migrate to the tin?

Thomas Szumloz
- DeWitt, New York

If you have known galvanic problems, I would investigate and correct those first, then see if the problem goes away.

Tom Pullizzi
Falls Township, Pennsylvania

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