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White Rust and Discoloration on Zinc Plated Parts

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We are having a problem with "White Rus" and discoloration on some CRS plated parts after the parts are powder coated. The customer specification for plating is as follows: FINISH: ZINC PLATE PER ASTM B-633 [link is to spec at TechStreet]-85, TYPE II Fe/Zn 8, COLOR YELLOW CHROMATE The parts are then powder coated. What can we do to prevent this from happening and allow for the maintenance of the shiny Gold Zinc appearance?

Regards,

Dan Chew
- Round Rock, Texas

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