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Contaminants in Chromic Acid Anodize attacking existing Hardcoat Chrome Anodize

Q. Hello,

I am wondering if anyone may know of a contaminant in a chromic acid anodize bath that may eat away at a previously hardcoated part? Basically, a part was chrome hard coated, then came to us and ran through the chromic anodize process. After, he previous hard coated area looks like something was eating away at it. I suspect it could either be a contaminant in the chromic bath or possibly something to do with the current in the bath. Analysis shows the chromic bath is in correct parameters. Any suggestions?

Ben Johnson
Lab Tech - St. Paul, Minnesota
April 18, 2012

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