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HARD CHROME PLATING 12L14 PARTS

My company does hard chrome plating, and are working with a job that the part is made of 12L14 and we are plating the O.D. of the part only and we are getting a black mark on the unplated I.D. after we chrome plate. We would like to get any opinions of what this could be and how to stop it from taking place.
Regards,

Michael Wilson
Plating Shop Employee - Toledo, Ohio USA
December 2, 2009

I would look at silicon pull plugs to prevent solution from getting into the ID. No solutions = no black.

James Watts
- Navarre, Florida
December 5, 2009

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