Corrosion resistance test process for article formed of metal ma

Details Corrosion resistance test process for article formed of metal ma Corrosion resistance test process for article formed of metal ma

1998-05-05

1999-10-26

Bell, Bruce F.

Electrolysis: processes, compositions used therein, and methods

Electrolytic analysis or testing

For corrosion

2057755, 205341, 205342, 324 712, 324700, 324713, G01N 2726

Patent

active

059721987

ABSTRACT:
It is an object of the present invention to provide a corrosion resistance test process, wherein the estimation of the corrosion resistance of an article formed of a metal material and a coating can be carried out synthetically and in a short time. In carrying out a corrosion resistance test, the article is immersed into an electrolytic solution and then, a voltage is applied to the metal material to carry out a metal material corroding step and a coating peeling-off step alternatively and repeatedly. The voltage applied to the metal material is a superimposed voltage Vd+Va resulting from superimposition of a DC voltage Vd and an AC voltage Va. A voltage condition of Vd<0 and Vd+Va>0 is established at the metal material corroding step, while a voltage condition of Vd<0 and Vd+Va<0 is established at the coating peeling-off step.

REFERENCES:
patent: 4266187 (1981-05-01), Slough
patent: 5338417 (1994-08-01), Brucken et al.
patent: 5466349 (1995-11-01), Tench et al.
patent: 5519330 (1996-05-01), Yamauchi et al.
patent: 5529683 (1996-06-01), Critz et al.
Patent Abstracts of Japan, JP-4 076447, Mar. 11, 1992.

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