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Ted Mooney, P.E. RET
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for Metal Finishing 1989-2025
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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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