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01299 USE OF REFERENCE ELECTRODES FOR GALVANIC CORROSION AND STRAY CURRENT DETECTION AND ASSESSMENT

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Product Number: 51300-01299-SG
ISBN: 01299 2001 CP
Author: James F. Jenkins
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In order to detect and evaluate the effects of galvanic corrosion and stray current corrosion on underwater structures and equipment, the U.S. Navy has applied an underwater electric field detector and an underwater voltmeter, both using reference electrodes. The underwater electric field detector was originally developed as an instrument to measure electrical fields for diver safety purposes, but was found to be useful for evaluating galvanic corrosion and corrosion-related stray currents. The underwater electric field detector uses pseudo-reference electrode of titanium but compensates for reference electrode potential drift electronically. The underwater voltmeter was initially developed for evaluating the effectiveness of cathodic protection systems, but was also found to be useful for evaluating galvanic corrosion and corrosion-related stray currents. The underwater voltmeter uses a dry type silver-silver chloride reference electrode and a titanium contact probe. The values of electrical field strengths of interest and the interpretation of potential measurements are described. The characteristics and use of these diver-operated devices in evaluating corrosion-related problems are described. Additional techniques for monitoring stray currents and galvanic corrosion are also described.

Keywords: reference electrode, galvanic corrosion, stray currents, underwater electric field detector, underwater voltmeter.
In order to detect and evaluate the effects of galvanic corrosion and stray current corrosion on underwater structures and equipment, the U.S. Navy has applied an underwater electric field detector and an underwater voltmeter, both using reference electrodes. The underwater electric field detector was originally developed as an instrument to measure electrical fields for diver safety purposes, but was found to be useful for evaluating galvanic corrosion and corrosion-related stray currents. The underwater electric field detector uses pseudo-reference electrode of titanium but compensates for reference electrode potential drift electronically. The underwater voltmeter was initially developed for evaluating the effectiveness of cathodic protection systems, but was also found to be useful for evaluating galvanic corrosion and corrosion-related stray currents. The underwater voltmeter uses a dry type silver-silver chloride reference electrode and a titanium contact probe. The values of electrical field strengths of interest and the interpretation of potential measurements are described. The characteristics and use of these diver-operated devices in evaluating corrosion-related problems are described. Additional techniques for monitoring stray currents and galvanic corrosion are also described.

Keywords: reference electrode, galvanic corrosion, stray currents, underwater electric field detector, underwater voltmeter.
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