Process for improving the adhesion of paint to steel sheets

Details Process for improving the adhesion of paint to steel sheets Process for improving the adhesion of paint to steel sheets

1979-04-09

1980-07-22

Williams, Howard S.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

204181C, C25D 1320

Patent

active

042138396

ABSTRACT:
The adhesion of paint to steel sheets is improved by pretreating the steel sheets, prior to conventional annealing, surface finishing, oiling, degreasing, phosphating and painting operations, by connecting the steel sheet alternately as cathode and anode in an electrolytic cell containing a bath of 0.5 M-2 M sodium sulphate aqueous solution. The operating temperature is 20.degree.-100.degree. C., the pH is 6-8, the current density is 1 to 50 A/dm.sup.2, and the treatment time is 0.1-30 seconds, preferably 0.5-20 seconds, and most preferably about 5 seconds as cathode followed by about 5 seconds as anode.

REFERENCES:
patent: 3620949 (1971-11-01), Morrison et al.

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