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11020 Electrochemical Properties During Film Degradation of Coated Steel

Product Number: 51300-11020-SG
ISBN: 11020 2011 CP
Author: Noboru Kawai, Junichi Tani, Masanori Nagai and Hiroyuki Tanabe
Publication Date: 2011
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Organic coatings are widely used in the steel structures of power transmission and distribution systems to protect against corrosion. Early and accurate detection of coating degradation is clearly of critical importance. We investigated two methods for evaluating coating degradation—the alternating current (AC) impedance method and the current-interrupt (CI) method—by exposing coated steel specimens to either long-term atmospheric exposure or shorter-term salt-water immersion, and then measuring their electrochemical behavior. We also analyzed coating degradation by x-ray probe microanalysis.

Key words: Coating, Corrosion, Electrochemical techniques, Alternating current impedance, Current interrupt method, Under-film corrosion
Organic coatings are widely used in the steel structures of power transmission and distribution systems to protect against corrosion. Early and accurate detection of coating degradation is clearly of critical importance. We investigated two methods for evaluating coating degradation—the alternating current (AC) impedance method and the current-interrupt (CI) method—by exposing coated steel specimens to either long-term atmospheric exposure or shorter-term salt-water immersion, and then measuring their electrochemical behavior. We also analyzed coating degradation by x-ray probe microanalysis.

Key words: Coating, Corrosion, Electrochemical techniques, Alternating current impedance, Current interrupt method, Under-film corrosion
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