分極特性測定によるオーステナイト不銹鋼の耐食域の判定 (予報)

抄録

The anodic polarization curves were obtained for the stainless steels of AISI types 304 and 316 in aerated sulfuric acid solutions by using the improved type of Hickling's potentiostat. The results were analyzed based upon Rocha's principle and were presented in terms of ‘active-passive’ regions that depend on acid concentration and temperature. The region of self-passivation determined by this method was in a good agreement with that obtained by the other usual method such as the device to trace the spontaneous potential. It was pointed out that the polarization method is superior to the other usual method in judging quickly whether the specimen becomes passive or remains active under a given condition and also in determining quantitatively the degree of the stability of the specimen in the passive region.