Method for electrochemically coating a metallic substrate with a

Details Method for electrochemically coating a metallic substrate with a Method for electrochemically coating a metallic substrate with a

1979-04-06

1980-11-04

Williams, Howard S.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

204 14N, C25D 902, C25D 1308

Patent

active

042318513

ABSTRACT:
Adherent insoluble coating film of a phenolic resin is obtained by electrolysis of an alkaline-reacting aqueous electrolyte comprising phenol, a mono- or di-substituted phenol with substituent(s) in o- or m-position, and an alkylene diamine, in specific proportions. The current density shall never exceed 10 mA/sq.cm. The voltage is from 2.5 V to 10 V and is preferably kept constant. Coating thickness values exceeding 1 micron and up to about 25-30 microns are obtainable within a short time at the expense of 2-2.5 Faradays per mole deposited phenol. The substituted phenol is preferably o-chloro-phenol, and the diamine is preferably ethylenediamine.

REFERENCES:
patent: 3335075 (1967-08-01), Borman
patent: 3655543 (1972-04-01), Dijkstra et al.

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