Process for producing manganese-containing phosphate...

Details Process for producing manganese-containing phosphate... Process for producing manganese-containing phosphate...

C - Chemistry, Metallurgy

23

C

C23C 22/36 (2006.01)

Patent

CA 2058631

- 12 - PROCESS FOR PRODUCING PHOSPHATE COATINGS CONTAINING MANGANESE ON METAL SURFACES Abstract of the Disclosure The invention relate to a process for producing phosphate coatings containing manganese on surfaces of steel, galvanized steel, aluminum and/or the alloys thereof or of aluminum-steel composite materials by spraying or spray-immersion with an aqueous solution containing 0.8 to 1.4 g/l of Zn2+, 0.6 to 2.0 g/l of Mn2+, 0.3 to 1.4 g/l of Ni2+, to 25 g/l of PO43-, 2 to 10 g/l of NO3-, 0.2 to 1.0 g/l of F3- and, as an accelerator of the phosphate deposition, 0.04 to 0.12 g/l of NO2-, 0.6 to 2.0 g/l of ClO3- and/or 0.2 to 1.0 g/l of sodium-3-nitrobenzene- sulfonate, the content of free acid having been adjusted to from 1. 4 to 1. 8 points and the solution having a total acid content of from 18 to 30.

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