Effects of gamma-ray irradiation on crevice corrosion repassivation potential of stainless steel in high temperature diluted simulated seawater*. Issue 7 (2nd July 2016)

• Record Type: Journal Article
• Authors: Tachibana, Masahiko; Ishida, Kazushige; Wada, Yoichi; Ota, Nobuyuki; Shigenaka, Naoto
• Is Part Of: Journal of nuclear science and technology. Volume 53:Issue 7(2016)
• Page Start: 981
• Page End: 991
• Publication Date: 2016-07-02
• Subjects: crevice corrosion -- seawater -- stainless steel -- high temperature -- gamma ray; Nuclear engineering -- Periodicals; Nuclear physics -- Periodicals; Nuclear energy -- Periodicals; 621.4805
• DOI: 10.1080/00223131.2015.1085814
• Languages: English
• ISSNs: 0022-3131

Abstract

Abstract : The crevice corrosion repassivation potentials ( E R, CREV ) of type 304 stainless steel (304 SS) were measured in high temperature (373–553 K), diluted simulated seawater under gamma-ray irradiation, in order to confirm the effects of gamma-ray irradiation on the crevice corrosion behavior of a representative stainless steel in seawater. Overall, for high temperatures, the E R, CREV values decreased with increasing chloride ion concentration, which was the same as the behavior observed under the non-irradiated condition. The E R, CREV values measured under gamma-ray irradiation were the same or slightly higher than E R, CREV values measured under the non-irradiated condition when the [Cl − ] was the same. Consequently, it was confirmed that the threshold potential of crevice corrosion of 304 SS for the gamma-ray irradiation of 1.8 kGy at least did not deteriorate compared with the non-irradiated condition. Under the conditions of this work (seawater composition, [Cl − ] range, dose rate, absorbed dose, flow rate, etc.), the crevice corrosion of 304 SS could be suppressed by maintaining the potential below the threshold potential which was determined approximately as −0.3 V vs. SHE even for the irradiated condition at temperatures up to 553 K.