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Powder Coating vs. P-Alkalinity

Can the P-alkalinity level in a surface treatment wash solution be a factor in having poor powder coating adhesion to steel?

Richard Jesse
buyer - Champaign, IL, USA
October 21, 2009

What ever is happening in the wash tank is rinsed off and replaced by the iron phosphate coating which is an acidic solution. The only way that the wash could be affecting the adhesion is if the parts going through are not getting clean. If they are not clean the phosphate tank won't do it and you end up with a layer of dirt between the substrate and the coating which is the basis of an adhesion problem.

Sheldon Taylor
supply chain electronics
Wake Forest, North Carolina
October 23, 2009

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