Novel process for pretreating and coating metallic substrates el

Details Novel process for pretreating and coating metallic substrates el Novel process for pretreating and coating metallic substrates el

1982-02-11

1983-12-20

Williams, Howard S.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

204181R, 204181T, C25D 1306, C25D 1308, C25D 1320

Patent

active

044216203

ABSTRACT:
An electrophoretic process for preparing corrosion-resistant substrates is disclosed. The process comprises sequential electrophoretic steps of anodic electrophoresis, followed by cathodic electrophoresis. The electrophoretic composition comprising an aqueous dispersion of a reaction product of a tannin, an epoxy material and a cationic water-solubilizing salt group is employed.

REFERENCES:
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patent: 3954588 (1976-05-01), Hazan et al.
patent: 4039353 (1977-08-01), Kulick et al.
patent: 4054466 (1977-10-01), King et al.
patent: 4086182 (1978-04-01), Hengelhaupt et al.
patent: 4105840 (1978-08-01), Cohen
patent: 4111722 (1978-09-01), Reghi et al.
patent: 4213839 (1980-07-01), Azzerri et al.
"Anticorrosive Properties of Mimosa (Wattle) Tannin," by A. J. Seavell, J. Oil Col. Chem. Assoc., 1978, 61, pp. 439-462.
Troy Chemical Corp. product literature entitled ACTAN.sup.SP .RTM. Rust Converter.
General Electric product literature entitled METHYLON.RTM. Resins.

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