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Adhesion and chemical resistance of thin dense chrome

2005

We are using highly reputable source for application of thin dense chrome (TDC) .0001 to .0003 thick applied selectively over large 4130 steel component, Rc 25-30. Part is then manganese phosphate coated by different source. Phosphate normally does not adhere to the chrome. Had major problem recently when, during phosphate, the chrome plating was totally stripped from one part. Other parts ran fine.

We now have all processing on hold pending resolution.

Has anyone seen this before?

What factors might have caused the chrome to be striped from one part?

Jim Hobson
contract machine service - Detroit, Michigan

Sounds like your phos coater put one part in muriatic acid.

Jeffrey Holmes, CEF
Spartanburg, South Carolina
2005

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