Process of producing phosphate coating on metals

Details Process of producing phosphate coating on metals Process of producing phosphate coating on metals

C - Chemistry, Metallurgy

23

C

148/17

C23C 22/12 (2006.01) C23C 22/13 (2006.01) C23C 22/16 (2006.01) C23C 22/18 (2006.01) C23C 22/36 (2006.01) C23C 22/77 (2006.01)

Patent

CA 2022728

In a process of phosphating iron and steel surfaces according to the low-zinc technology, a nitrite-free aqueous acidic phosphating solution at 30 to 64 °C is used, which contains 0.4 to 1.7 g/l Zn 7 to 25 g/l P2O5 2 to 30 g/l NO3 and in which the weight ratio of free P2O5 to total P2O5 is adjusted to a value in the range from 0.04 to 0.20, H2O2 or alkali perborate is added to the phosphating solution in such an amount that - being in working condition - the peroxide concentration is not in excess of 17 mg/l (calculated as H2O2) and the Fe(II) concentration respectively is not in excess of 60 mg/l (calculated as Fe). It will be particularly desirable to control the addition of H2O2 and/or alkali borate in dependence on the electrochemical potential, which is determined by a redox electrode. The phosphating solution may additionally contain Mn, Ni, Co, Mg and/or Ca and/or fluoroborate, fluorosilicate and/or fluoride. The process can particularly be used to prepare metallic surfaces before they are painted.

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