Process for producing manganese-containing zinc phosphate coatin

Details Process for producing manganese-containing zinc phosphate coatin Process for producing manganese-containing zinc phosphate coatin

1993-09-16

1994-12-13

Silverberg, Sam

Metal treatment

Process of modifying or maintaining internal physical...

Processes of coating utilizing a reactive composition which...

C23C 2207

Patent

active

053726561

ABSTRACT:
In a process for phosphatizing electrolytically and/or hot-dip galvanized steel strip, the steel strip is briefly treated with acidic phosphatizing solutions which contain, in addition to zinc and phosphate ions, manganese and nickel cations and anions of oxygen-containing acids with an accelerator effect. The weight ratio of nickel cations to nitrate anions is adjusted to between 1:10 and 1:60 and the weight ratio of manganese cations nitrate anions is adjusted to between 1:1 and 1:40.

REFERENCES:
patent: 4849031 (1989-07-01), Hauffe
EP-0-106-459; European Pat. App. Apr. 25, 1984.
EP-0-228151 European Pat App. Jul. 8, 1987.

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