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Chemical reaction between powder and galvanizing.(powder coating clinic)
From:
Products Finishing
| Date:
June 1, 2006| Author:
Liberto, Nick P.E.
| COPYRIGHT 2006 Gardner Publications, Inc. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group.Copyright information
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Q. We have specified powder coating over galvanized metal surfaces for a gate. The contractor recommends not galvanize the gate because the final product will have dots due to chemical reaction. A.S.
A. The "dots" that your contractor is referring to are not caused by a chemical reaction between the galvanizing and the powder coating. They are, however, pinholes in the coating that are caused by the zinc galvanizing out-gassing when the powder coating is cured in an oven...
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