オーステナイト系不銹鋼の応力腐食割れに関する研究(第 5 報) : 電解による電位変化が割れの発生および伝播におよぼす影響について

概要

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We discussed the relation between corrosion potential and the so called "induction period" of austenitic stainless steels which were subjected to stress corrosion cracking test under cathodic or anodic electrolysis. In the case of cathodic electrolysis, the corrosion potential of the test piece was lowered. Consequently, it took longer time until the corrosion potential reached the necessary value for initiation of crack described in the previous reports. Therefore, the induction period was also lengthened. When the current density of cathodic electrolysis increased sufficiently, no stress corrosion crack occurred during the test time. In this case, the corrosion potential did not reach the necessary value for initiation of crack. This is the mechanism of prevention of stress corrosion cracking by the cathodic electrolysis. Next, we applied the cathodic current to the restrained welded plate being under stress corrosion test, and proved that the cathodic electrolysis would be effective to prevent stress corrosion cracking. Moreover, we made clear that the propagation of stress corrosion crack could also be controlled by the corrosion potential of test piece.
社団法人溶接学会の論文
1967-07-25