Composition and process for the phosphatizing of metals
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United States of America Patent
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Jun 21, 1983
Grant Date -
N/A
app pub date -
Jan 8, 1982
filing date -
Jan 22, 1981
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A composition for the phosphatizing of metals, particularly iron and steel, which comprises an aqueous acidic, chlorate-containing zinc phosphate solution which contains from 0.5 to 1.5 g/liter Zn from 0.4 to 1.3 g/liter Ni from 10 to 26 g/liter P.sub.2 O.sub.5 from 0.8 to 5 g/liter Cl0.sub.3 and in which no nitrite is added, and in which the weight ratio of Zn to Ni shall be adjusted to a value of 1: (from 0.5 to 1.5), that of Zn to P.sub.2 O.sub.5 to a value of 1: (from 8 to 85) and that of free P.sub.2 O.sub.5 to a value of from (0.005 (at about 30 degrees C.) to 0.06 (at about 60 degrees C.)): 1. The composition is particularly useful in processes for the preparation of metal surfaces for electrophoretic coating, particularly for cathodic immersion coating.
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