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Hard-anodized coating grew a bump during dyeing

I hard-anodized 7075 and averything was fine until I dye the part when I took out of the dye tank got like little bump in the part?

Disraely Colon
plating shop employee - Baltimore, Maryland, USA
August 12, 2009

OK, what is a "bump"? Did it wipe off? Are you sure it was not there after anodizing? Do you have a 5% nitric acid dip between the anodize and the dye? Are you racked on titanium? What is the dye tank made of -stainless steel or plastic? What is the dye tank heated with - stainless steel?
Try to give us some more information.

Robert H Probert
Robert H Probert Technical Services

Garner, North Carolina

August 17, 2009

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