Process of phosphating before electroimmersion painting

Details Process of phosphating before electroimmersion painting Process of phosphating before electroimmersion painting

C - Chemistry, Metallurgy

23

C

148/17

C23C 22/13 (2006.01) C23C 22/18 (2006.01) C23C 22/36 (2006.01)

Patent

CA 1332910

In a process of phosphating workpieces made of steel or partly galvanized steel in preparation for electro- immersion painting the cleaned and rinsed workpieces are first activated with a weakly alkaline aqueous solution which contains titanium phosphate and are subsequently dipped into an acid aqueous phosphating solution at a temperature from 40 to 60°C. The solution contains: 1.8 to 5 g/l Zn 0.1 to 7 g/l Fe(II) 8 to 25 g/l P2O5 to 30 g/l NO3 and in the solution, the controlled ratio of free acid to total acid is between 0.04 and 0.07. The phosphating solution preferably contains 3 g/l zinc and 0.5 to 5 g/l iron (II) and additionally contains up to 3 g/l manganese. Other suitable components of the phosphating solution are Co, Ni, hydroxylamine, fluorides, tartaric acid, citric acid, and m-nitrobenzene sulfonate.

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