Metal treatment – Compositions – Heat treating
Patent
1980-12-17
1981-12-22
Kendall, Ralph S.
Metal treatment
Compositions
Heat treating
148 617, C23F 708
Patent
active
043069177
ABSTRACT:
A conversion coating solution for treating metallic surfaces has a pH value in the range of 3 to 6 and contains 1 g/l to 50 g/l of an acid alkali phosphate as phosphate ions, 0.2 g/l to 20 g/l of one or more of chlorates and bromates, and 0.01 g/l to 0.5 g/l of tin ions, with a weight ratio of chlorine ions to tin ions being between 0.6 and 6. The solution provides a continuous and uniform conversion coating having high anti-corrosion performance.
REFERENCES:
patent: 2490062 (1949-12-01), Jernstedt
patent: 2873196 (1959-02-01), Baevsky
patent: 3076733 (1963-02-01), Otto
patent: 4220486 (1980-09-01), Matsushima et al.
Oda Nobuyuki
Terada Haruyoshi
Kendall Ralph S.
Nihon Parkerizing Co. Ltd.
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