Abstract
Localized corrosion rates on buried metallic structures have been quantitatively evaluated by detecting the magnetic fields generated by electrochemical reactions. These results were obtained using electrochemical impedance spectroscopy instrumentation modified to include a SQUID magnetometer as the electrical current sensor. Data from field studies on buried pipes are presented which show that the local corrosion rate of an isolated segment of an extended structure can be measured without local contact to the structure. This permits high activity regions on large structures with spatially varying corrosion rates to be mapped and evaluated.
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