Composition and process for the production of phosphate...

Details Composition and process for the production of phosphate... Composition and process for the production of phosphate...

C - Chemistry, Metallurgy

23

C

117/214, 6/225

C23C 22/14 (2006.01)

Patent

CA 1175606

ABSTRACT OF THE DISCLOSURE An aqueous acidic zinc phosphate solution which contains at least 6 g/l of Zn, at least 5 g /l P2O5, at least1.0 of an accel- erator, calculated as C103, from about 1 to about 50g/l of sulfate ion which solution has a total acid number of at least 20, a weigth ratio of free P205: total P205 of 0.2-0.6:1 and a weigth ratio of P205: C103 of 1:0.5-4.0: 0.01-1Ø The phosphatinzing bath preferably contains from about 1 to 5g/1 chlorate in com\bination with at least 8g/1 nitrate, with a weight ratio of P205: NO3 0f 1:0,2-6Ø The baths may be used to form phosphate coating on ferrous metal surfaces using immersing or flow coating techniques anf the phosphate coating formed are found to have increased thickness and adhesion or coalesouence to the metal surface.

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