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topic 7300

Primer Compatibility to Hot Dip Galvanized Surface


My corporation is currently having a problem with an assembly which is hot-dipped galvanized and subsequently painted. We have gone through an extensive analysis of the situation and cannot find a way to maintain adhesion of the paint without grit blasting prior to painting. For cost reasons, we would like to avoid grit blasting.

Assuming we have the process (galvanizing, cleaning, pretreatment etc.) correct and under control, one possibility that Amer. Galvanizers Association suggested is that our primer may not be entirely compatible with a zinc coating. Currently, we are using a MIL-P-53022 epoxy primer to coat the part. The contact at AGA implied that many paint manufacturers formulate primer/topcoats specifically for use on galvanized surfaces. Can anyone elaborate on this? Should we be concerned with using this primer on galvanized components? Thanks.

Mark Thomas
- Oshkosh, Wisconsin

Latex Self-Etching Primer

April 15, 2009

Hi, Mark. You say you have the "pretreatment" correct, but I'm wondering whether this refers to pretreatment before galvanizing or pretreatment before priming. Phosphate conversion coating is required between galvanizing and painting. Good luck.


Ted Mooney, Teds signature
Ted Mooney, P.E. RET
Pine Beach, New Jersey

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