Metal treatment – Compositions – Heat treating
Patent
1979-03-29
1980-11-11
Kendall, Ralph S.
Metal treatment
Compositions
Heat treating
148 615R, C23F 710, C23F 712
Patent
active
042330882
ABSTRACT:
A process for inhibiting corrosion and providing a foundation for subsequent application of organic coating systems to metal surfaces, such as steel surfaces and zinc-, lead-, copper- and tin-coated surfaces, comprises the development of a protective phosphatizing reaction coating based on a metal other than the metal which is to be protected either by an immersion treatment or by a spray treatment with a phosphatizing bath which contains the metal phosphate or metal acid phosphate matter for such a treatment in a status nascendi. Such a state is obtained by the use of an aqueous medium containing phosphate ions derived from an alkali metal phosphate, an alkali metal acid phosphate, phosphoric acid or combinations of those and introducing into the aqueous medium a metal oxide based on a metal other than that which is to be treated, preferably an oxide of the metal group of molybdenum, vanadium, tungsten, titanium, lead, manganese and copper, whereby the metal oxide in the aqueous medium forms with the phosphate ions of the aqueous medium the desired freshly prepared metal phosphate or metal acid phosphate to develop on the treated metal surface the required protective reaction coating. The phosphatizing bath can be modified further by introducing into the aqueous medium a ligand-forming organic polymer which is capable of entering the reaction coating formation and said polymer can further be influenced also by the addition into the aqueous medium of a small amount of an acetylenic alcohol or a dialdehyde. Also a dispersing agent, such as formamide or an alkyl-substituted formamide, can be employed to increase the reactivity of the metal oxide component.
REFERENCES:
patent: 1069903 (1913-08-01), Richards
patent: 1311319 (1919-07-01), Colquhonn
patent: 1514494 (1924-11-01), Williams
patent: 1677667 (1928-07-01), Zimmerman
patent: 2046061 (1936-06-01), Curtin
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patent: 2854370 (1958-09-01), Kronstein
patent: 3272663 (1966-09-01), Kronstein
patent: 3528860 (1970-09-01), Kronstein
patent: 3819385 (1974-06-01), Schumichen et al.
Kronstein, Australian Paint Journal, Jun. 1966, vol. 12, No. 3, pp. 13-21.
International Lead Zinc Research Organization, Inc.
Kendall Ralph S.
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