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White rust on back of the prepainted galvanized strip

Duplex Systems: Painting Over Hot-Dip Galvanized Steel
by American Galvanizers Association

(free download from AGA)

Self-Etching Primer
on
Amazon

(affil links)

2005

Dear sir
We have problem about white rust and peeling off the paint especially on the back of strip after 3-5 month after production. Would you please explain the reason of this effect. How can we solve this problem?
thank you.

Heibat Ollah Torki
mobarakeh steel company - Mobarakeh, Esfahan, Iran

Well, since we have zero idea of your current process, how can we make a proper technical answer?
I would guess that you have a poor quality phosphate or you are using a inappropriate primer (or none) or are using a paint that is not compatible with the primer.

James Watts
- Navarre, Florida
2005

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