Broadly applicable phosphate conversion coating composition...

Details Broadly applicable phosphate conversion coating composition... Broadly applicable phosphate conversion coating composition...

C - Chemistry, Metallurgy

23

C

C23C 22/44 (2006.01) C23C 22/36 (2006.01)

Patent

CA 2120614

An aqueous liquid combination of simple and complex fluorides, a chelating agent for iron, phosphate ions, a hydroxyla- mine source, and an oxidizing agent selected from among water soluble nitroaromatic organic compounds, molybdates, and tung- states, 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 pro- duce 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.

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