Phosphating process

Details Phosphating process Phosphating process

C - Chemistry, Metallurgy

23

C

148/17

C23C 22/13 (2006.01) C23C 22/12 (2006.01) C23C 22/36 (2006.01)

Patent

CA 1332560

ABSTRACT OF THE DISCLOSURE: For phosphating galvanized surfaces, particularly of galvanized steel, surfaces are contacted for up to 10 seconds with a phosphating solution which contains accelerator, particularly nitrate, 0.5 to 5.0 g/l zinc, 3 to 20 g/l phosphate (calculated as P2O5), 0.3 to 3 g/l magnesium, at a weight ratio of magnesium: zinc = 0.5 to 10:1. The solution has an S value in the range from 0.1 to 0.4 and is replenished with a concentrate in which the weight ratio of zinc to phosphate (calculated as P205) is in the range from 0 to 1:8. It is particularly desirable to use phosphating solutions which contain up to 1.5 g/l zinc, preferably 0.5 to 1 g/l zinc, at a weight ratio of magnesium : zinc of 0.5 to 3:1 and nickel ions in an amount of up to 1.5 g/l, preferably in an amount of up to 0.5 g/l. Furthermore simple or complex fluoride may be present in an amount of up to 3 g/l, preferably 0.1 to 1.5 g/l (calculated as F in each case). A special advantage is afforded by the use of the process when treating galvanized steel strip which is to be subsequently painted or coated with preformed organic films.

608617

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