抵抗測定法の金属腐食研究への応用

概要

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Resistometry has been applied to the corrosion studies of Fe, Ti and Al electrodes in a thin wire form. Dissolution depth of Fe wire in the active potential range during potential sweep was estimated from resistance data and was consistent with the value obtained from the electric charge. In the passive potential range, the dependence of resistance on growth of the passive film and change in space charge layer of the passive film were observed. For Ti and Al electrodes, resistance changes due to anodic oxide growth were observed. In the high voltage range, however, the temperature of specimens rose due to increase in electric energy loss in the oxide film, and thus the resistivity increased apparently. For Ti electrodes, the growth of the hydride layer was monitored using resistometry under the condition of electrochemical hydrogen loading. For Al electrodes, cathodic dissolution under the condition of hydrogen evolution was measured. In the acidic solution, cathodic passivation phenomenon was observed in which a deposition layer of Al hydroxide suppressed the cathodic reaction.
社団法人表面技術協会の論文
2003-03-01