Process of producing phosphate coatings on metal surfaces

Details Process of producing phosphate coatings on metal surfaces Process of producing phosphate coatings on metal surfaces

C - Chemistry, Metallurgy

23

C

148/17

C23C 22/12 (2006.01) C23C 22/36 (2006.01) C23C 22/77 (2006.01) C25D 13/20 (2006.01)

Patent

CA 1308338

ABSTRACT OF THE DISCLOSURE: In a process of producing phosphate coatings on surfaces which consist of aluminum or its alloys and of at least one of the materials steel and galvanized steel by spraying or by spraying and dipping, uniform phosphate layers having a high cover factor are obtained by the use of a phosphating solution which contains: 0.4 to 0.8 g/l Zn to 20 g/l P2O5 at least one accelerator and 80 to 220 mg/l fluoride ("F(el)"), as determined by a fluoride-sensitive electrode immersed into the bath solution and in which the content of free acid (FA) (in points) has been adjusted to and is maintained at a value corresponding to FA = (0.5 to 1.0) + K wherein K is calculated at K = (0.002 to 0.012) x F(el). The free acid (FA) content is preferably adjusted to and maintained at Fa = (0.04 to 0.06) x Cp2O5 + K and the content of free acid (FA) is determined using K = (0.003 to 0.009) x F(el). The process is particularly suitable for preparing the surface for being painted, preferably by electrophoretic dip painting.

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