ランダム電位パルス法によるステンレス鋼の鋭敏化度の迅速試験法(<小特集>腐食防食小特集)

概要

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A new measurement method (M-EPR) for evaluating a degree of sensitization (DOS) of stainless steels was proposed, which is the combination of EPR (electrochemical potentiokinetic reactivation) method (JIS G 0580) and random potential pulse one. The applicability to the DOS was examined by comparing the results of the EPR with that of the new method. The following results were obtained ; (1) The reactivation ratio obtained by the M-EPR method was proportional to that by the EPR one, and the coefficient of correlation between the two methods was 0.986. (2) The coefficient of variation of the M-EPR was 0.18, indicating the same degree of reproducibility as that of the EPR. (3) The shapes of voltammogram obtained by the M-EPR changed with dissolution behavior and corrosion forms of steels. It was indicated that the M-EPR method could be used for identification of corrosion forms by pattern recognition. These results show that this new technique is applicable to the rapid evaluation of the DOS of stainless steels.
1992-09-15