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White rust appears on galvanized pipes

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Sir ,

We see that after 5-6 months the galvanized pipes get white rust on areas of contact with other pipes in a bundle. How we could finish White rust.

Muhammad Yousuf
IIL Pakistan - Karachi, Sind., Pakistan

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Do you chromate them and dry them, Muhammad? Are the pipes touching during chromating? It sounds like they are either not chromated or not dry in the areas where they are touching, but please tell us what you've tried :-)

Thanks.

Ted Mooney, P.E.
finishing.com
Brick, New Jersey

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