Broadly applicable phosphate conversion coating composition and

Details Broadly applicable phosphate conversion coating composition and Broadly applicable phosphate conversion coating composition and

1991-11-01

1992-09-01

Silverberg, Sam

Metal treatment

Process of modifying or maintaining internal physical...

Processes of coating utilizing a reactive composition which...

148271, 148273, C23C 2234

Patent

active

051435624

ABSTRACT:
An aqueous liquid combination of simple and complex fluorides, a chelating agent for iron, phosphate ions, a hydroxylamine source, and an oxidizing agent selected from among water soluble nitroaromatic organic compounds, molybdates, and tungstates, provides good quality protective phosphate conversion coatings on ferrous, zinciferous, aluminous, and magnesium and magnesium alloy metal surfaces, without needing any divalent or higher valent metal cations such as are generally used to produce high quality phosphate conversion coatings. If the combination includes suitable surfactants, no prior chemical cleaning of the metal to be treated is required for good results.

REFERENCES:
patent: 3682713 (1972-08-01), Ries

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