Metals having phosphate protective films

Details Metals having phosphate protective films Metals having phosphate protective films

1997-12-15

2000-05-23

Gorgos, Kathryn

Stock material or miscellaneous articles

Composite

Of metal

205 50, 205210, 205212, 205213, 205216, 205217, 205318, 148241, 428457, 428704, B32B 900, B41M 520, C25D 534, C23C 836

Patent

active

060664037

ABSTRACT:
Novel metallic bodies are provided which present an essentially oxide-free surface protected by phosphate groups which directly and chemically bond to surface metal atoms. Metal surfaces such as Al or Fe can be protected by deposition of a phosphate film directly onto etched metal surfaces without intermediate naturally occurring oxides between the metal ions and protective phosphate groups. Preferably, metallic surfaces to be protected are first etched to remove oxides and other contaminants, followed by electrochemical treatment with a phosphate electrolyte to generate a protective film having a thickness of from about 20-100 .ANG. which is stable in ambient air.

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