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Ted Mooney, P.E. RET
Pine Beach, NJ
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for Metal Finishing since 1989
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How Do I Safely Remove "White Rust" From Hot Dip Galvanized Steel
I saw a series of messages on this site concerning corrosion of hot-dipped galvanized steel. We have a very similar problem on stamping blanks and some stamped parts that were improperly stored and developed white rust.
My question is, what is the best method of removing the rust without removing the galvanized surface? I saw one letter that recommended the use of a 5% phosphoric acid bath. Is that the best method?
Mike Woodstamping - Maumee, Ohio, USA
2001
There is some good information on white rust formation, prevention and correction at this web site
www.galvanizeit.org/publications/t-wss-97.htm
[Ed. note: that site has been rearranged since this posting and the specified URL no longer works]
Larry Hanke
Minneapolis, Minnesota
2001
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