Preliminary study of electrochemical corrosion behavior of F82H steel

Oyaizu, Makoto; Yamanishi, Toshihiko

The purpose of the present study is to elucidate the effects of tritium on corrosion behavior of F82H steel by means of electrochemistry, and the cold experiments were performed under highly corrosive circumstance of 5w% HSO/HO as a preliminary study. For the experiments, Tafel sweep and anodic polarization measurements were performed. As the results, the corrosion rate of F82H steel in the present circumstance could be estimated as 10 cm/year, which is 3 orders of magnitude larger than that of SUS304. In the anodic polarization curve, the regions of passivation, passive layer sustention, and over-passivation could be observed as well as SUS304. However, the ratio of the quantum of electricity for passivation of F82H/SUS304 was approximately 1000. Therefore, it was indicated that the corrosion rate of F82H would be much higher than that of SUS304, while further cold experiments especially under less corrosive circumstance should be performed.