Q. We plate many pieces in different finishes, and we apply powder coating to some of them. We have problems with fisheyes in some of our powder coated parts. What can we do to solve this problem? I. R.
A. Fisheyes are caused by contamination problems. In a plating operation, the cleanliness of the rinse tanks is very important. For powder coating to adhere properly and to eliminate fisheyes, the final stage should be re-circulated DI rinse water followed by a virgin DI halo mist. Also look at other sources of contamination in your powder coating process. Check your compressed air for oil and look for airborne contaminants, such as silicone, as possible sources for the fisheyes. Good luck.
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