Metal treatment – Compositions – Heat treating
Patent
1979-07-06
1980-09-02
Kendall, Ralph S.
Metal treatment
Compositions
Heat treating
148 617, C23F 708
Patent
active
042204860
ABSTRACT:
A conversion coating solution for treating metallic surfaces is able to form conversion coating films having excellent anticorrosiveness and giving good adhesiveness and gloss to the overcoating. The conversion coating solution has a pH value of 5.5 to 6.5 and contains 0.1 to 50 g/liter as phosphate ion of acid salts of alkali phosphates, 0.01 to 0.5 g/liter of stannous ion and 2 to 12-fold by weight as much fluorine ion as the stannous ion. The conversion coating solution may be further combined with 0.2 to 5 g/liter of at least one of pyrazole compounds, hydroxylamine compounds and hydrazine compounds.
REFERENCES:
patent: 2357269 (1944-08-01), Russell et al.
patent: 2490062 (1949-12-01), Jernstedt
patent: 2702768 (1955-02-01), Hyams
patent: 3515600 (1970-06-01), Jones et al.
patent: 3839099 (1974-10-01), Jones
Matsushima Yasunobu
Oda Nobuyuki
Terada Haruyoshi
Kendall Ralph S.
Nihon Parkerizing Co. Ltd.
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