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Help: non removable film formed on hard chrome after black oxide

After black oxide I got A layer of film (it looks like frosting) on the hard chrome that can't be take off by polishing or rubbing out. I was wondering what I could do to remove that film with out damaging the hard chrome.

The part is a cylinder with the oxide on the outside and the chrome on the inside.

Heath Einmo
- Phoenix, Arizona, USA
2004

We have black oxided many parts which have been hard chrome plated, and never seen any effect on the chrome. Two thoughts: 1) Chloride contamination of the black oxide from drag-in of HCl. 2) The chrome is very, very thin, and has enough porosity that the exposed steel is blackened.

Jeffrey Holmes, CEF
Spartanburg, South Carolina
2004

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