Electrocoating process

Details Electrocoating process Electrocoating process

1971-07-08

1976-07-27

Williams, Howard S.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

C25D 1306, C25D 1316

Patent

active

039717089

ABSTRACT:
Advantageously controlled paint film flow during curing of the film at elevated temperature for avoidance of inadequately coated areas is obtained in an electrocoating operation of an electrode workpiece employing as paint vehicle a mixture of electrodepositable resin and water-dispersible aminoplast or phenoplast resin crosslinkable therewith by incorporating into said vehicle, or into the bath containing same, a small proportion of curing accelerator acid such as a sulfonic acid which is codepositable with said paint film in concentration sufficient for yielding a substantially continuous cured film on the resulting coated substrate. The degree of cure of the deposited coating is monitored by monitoring a property of cured coating which is a function of the degree of cure, and the concentration of the curing accelerator in the bath is adjusted in response thereto to maintain the monitored property at a predetermined value.

REFERENCES:
patent: 3355373 (1967-11-01), Brewer et al.
patent: 3434952 (1969-03-01), Tsou
patent: 3585172 (1971-06-01), Nishiyama et al.
patent: 3627720 (1971-12-01), Hinton et al.
patent: 3657384 (1972-04-01), Yoshida et al.

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