Zinc phosphating method

Details Zinc phosphating method Zinc phosphating method

1985-08-14

1987-01-27

Kaplan, G. L.

Chemistry: electrical and wave energy

Processes and products

204 387, 204 561, C25D 1136

Patent

active

046392955

ABSTRACT:
A method for enhancing the corrosion resistance of a metal surface at the edge portion which comprises applying direct current to said metal surface as previously zinc phosphated as a negative electrode in an acidic solution comprising zinc ion in a concentration of 2 to 3 g/L, phosphate ion in a concentration of 8 to 14 g/L and chloride ion in a concentration of 3 to 6 g/L under the condition of 5 to 15 A/dm.sup.2 (metal surface) at a temperature of 20.degree. to 40.degree. C. to make an electric zinc phosphate coating film having corrosion resistance.

REFERENCES:
patent: 2514149 (1950-07-01), Amundsen
patent: 2540314 (1951-02-01), Amundsen
patent: 3090709 (1963-05-01), Henricks
patent: 3109757 (1963-11-01), Reinhold
patent: 3364081 (1968-01-01), Forsberg
patent: 3449222 (1969-06-01), Freeman et al.

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