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letter 28091
Electrolysis in New Construction Finishes
Design
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I work for a general contractor in the the state of Oregon,
warranty division. In 1999 we built a shopping center in Battleground
Washington.The canopies at the entries to the buildings are
constructed using a painted hot dipped galvanized steel frame
connected to aluminum panels and flashing for the roof. The
galvanized steel is showing a lot of pitting and rust. Could this be
caused by ELECTROLYSIS, because of the connecting of the two
dissimilar metals? If so, Who can I contact to verify this condition
and help to come up with a solution. Your help would be greatly
appreciated.
H. Wayne Buck
Construction - Portland, Oregon, USA
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I don't think that the Aluminum could cause the galvanized steel
to corrode; it should be the other way around.
I'd look into the internal corrosion starting from inside of the
steel pipes which were pickled before the galvanizing and remained
uncoated with zinc. You would have probably been better off not
galvanizing the pipes as the pickling operation before galvanizing
started off the rusting.
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Khozema
Vahanwala
Saify Ind
Bangalore, Karnataka, India
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