日本金属学会誌

J. Japan Inst. Metals, Vol. 48, No. 2 (1984),
pp. 191-197

A Measuring System for Current Distribution and Its Application to Corrosion Studies

Hiroyuki Kaneko1 and Hitoshi Taimatsu1

1Department of Metallurgy, Mining College, Akita University, Akita

Abstract:

A micro-computer controlled measuring system for the current distribution on a flat specimen immersed in an electrolyte was presented: The horizontal and normal potential changes on a plane in the solution adjacent and parallel to the specimen surface measured by scanning a set of two Luggin probes are set on-line to the input of a micro-computer, to analyze the current distribution and to display current maps on a CRT display.
The system was applied to the study of typical galvanic and pitting corrosions. Current maps obtained on the specimens consisting of copper-zinc couples demonstrated that zinc dissolved drastically along the copper-zinc boundary. A sequence of current maps with time obtained on a commercial aluminum demonstrated distinctly the generation and the growth process of pits.
Therefore, the measuring system developed in this study can be widely applicable to the in situ evaluation of local corrosion current as well as to the detection of corroding sites on a specimen.


(Received 1983/08/19)

Keywords:

corrosion detection, potential distribution, current distribution, scanning probe method, micro-computer control, galvanic corrosion, pitting corrosion, aluminum, copper-zinc couple


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