Pitting corrosion meter

Details Pitting corrosion meter Pitting corrosion meter

1982-01-15

1983-07-26

Weisstuch, Aaron

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204 1T, 204406, 204412, G01N 2730, G01N 2746

Patent

active

043953182

ABSTRACT:
Test, auxiliary and reference electrodes are immersed in a corrodant fluid. The test electrode is cathodically polarized by a cathodic polarization circuit. Peak current flow in the auxiliary electrode is measured and a linear cathodic polarization function is generated by a computer circuit. The test electrode is forwardly and reversely anodically polarized by an anodic polarization circuit. A comparator circuit senses the voltage of the test electrode with respect to the auxiliary electrode during reverse anodic polarization and compares this value to the cathodic polarization function. When the test electrode voltage and cathodic polarization function are equal, an anodic memory circuit stores the value of the current passing through the test electrode. This current is the pitting current which is converted into pitting rate.

REFERENCES:
patent: 3660249 (1972-05-01), Townsend
patent: 3855101 (1974-12-01), Wilson
patent: 3878064 (1975-04-01), Weisstuch et al.
patent: 4056445 (1977-11-01), Gauntt et al.
patent: 4294667 (1981-10-01), Yamamoto et al.
W. S. Tait, "Comparison of Potentiodynamically Determined Pitting Rates with Actual Pitting Rates for Mild Steel & Admiralty Brass in Oxygen Bearing Water", Corrosion, vol. 34 (6), pp. 214-218 (1978).
R. L. Martin "Potentiodynamic Polarization Studies in the Field", Materials Performance, vol. 18 (3), pp. 41-50 (1979).
L. G. Gainer et al., "An Apparatus for the Examination of Localized Corrosion Behavior", Corrosion, vol. 35 (2), pp. 61-67 (1979).

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