Petrolite Corporation

Richard A Rodgers

Richard Martin

William S Tait

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.

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St. Louis, MO, United States of America

Richard A Rodgers