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Ambai, Hiromu; Sano, Yuichi; Nishizuka, Yusuke*; Iijima, Shizuka; Uchida, Naoki
Zairyo To Kankyo, 66(5), p.169 - 172, 2017/05
We study the effect of sulfate ion which is one component of seawater or concrete on the corrosion behavior in high active liquid waste tank environment. The corrosion tests were conducted using SUS316L and surrogate high active liquid waste containing some metal ions and nitric acid. The results showed that sulfate ion inhibited the corrosion rates. The XPS results indicated the attachment of sulfate ion to material surfaces suppressed the anode reaction.
Soma, Yasutaka; Kato, Chiaki; Ueno, Fumiyoshi
Fushoku Boshoku Kyokai Dai-63-Kai Zairyo To Kankyo Toronkai Koenshu, p.253 - 256, 2016/10
Contribution of corrosion to advance of stress corrosion cracking (SCC) of stainless steel in high temperature water must be assessed because serious corrosion can be found within SCC of light water reactors. The corrosion took the form of both intergranular and grain-matrix attack indicate aggressive corrosion condition was formed in the crevice of the SCC. We have investigated the crevice environment electrochemically and found that local electrical conductivity of the crevice solution at satisfactory narrow crevice gap having more than 100 times higher than that of bulk solution. In this research we assessed effect of cyclic deaerated and aerated bulk solution to the crevice environment. The result showed that electrical conductivity of the crevice solution under the deaerated bulk solution increased more than 10times by injection of pure oxygen suggest that the dissolved oxygen caused aggressive corrosion condition within the crevice.
Nishioka, Tsuyoshi*; Ogawa, Soma*; Tsuchiya, Hiroaki*; Fujimoto, Shinji*; Taniguchi, Naoki; Dobashi, Ryuta*
no journal, ,
no abstracts in English
Sano, Yuichi; Ambai, Hiromu; Nishizuka, Yusuke*; Iijima, Shizuka; Uchida, Naoki
no journal, ,
The effect of 
-ray irradiation on the corrosion behavior of SUS316L stainless steel, which is a typical material for the equipment used in reprocessing, in HNO
solution containing seawater components was investigated. Severe corrosion just after immersion and thin streaks of corrosion, which are observed in HNO solution containing seawater components, were prevented by -ray irradiation. The generation of Cl
was decreased by -ray irradiation, and it would suppress the corrosion progress.
Kaneko, Tetsuji*; Tanaka, Norihiko*; Kawaharada, Yoshiyuki*; Fujii, Kazumi*; Iwanami, Masaru*; Ishioka, Shinichi*; Yokoyama, Yutaka*; Umehara, Ryuji*; Kato, Chiaki; Ueno, Fumiyoshi; et al.
no journal, ,
no abstracts in English
Fujii, Kazumi*; Iwanami, Masaru*; Ishioka, Shinichi*; Kaneko, Tetsuji*; Tanaka, Norihiko*; Kawaharada, Yoshiyuki*; Yokoyama, Yutaka*; Umehara, Ryuji*; Kato, Chiaki; Ueno, Fumiyoshi; et al.
no journal, ,
no abstracts in English
-ray irradiationKato, Chiaki; Sato, Tomonori; Ueno, Fumiyoshi; Kaneko, Tetsuji*; Tanaka, Norihiko*; Kawaharada, Yoshiyuki*; Fujii, Kazumi*; Iwanami, Masaru*; Ishioka, Shinichi*; Yokoyama, Yutaka*; et al.
no journal, ,
no abstracts in English
Yokoyama, Yutaka*; Umehara, Ryuji*; Kaneko, Tetsuji*; Tanaka, Norihiko*; Kawaharada, Yoshiyuki*; Fujii, Kazumi*; Iwanami, Masaru*; Ishioka, Shinichi*; Kato, Chiaki; Ueno, Fumiyoshi; et al.
no journal, ,
no abstracts in English
Ishijima, Yasuhiro; Ueno, Fumiyoshi
no journal, ,
Zr has susceptibility of stress corrosion cracking (SCC) in boiling nitric acid solution under trans-passive conditions. However, it is not clear that the influence of the nitrate concentration and pH on de-passivation behavior for zirconium. In this study, the anodic polarization measurements that controlled pH and nitrate concentrations were carried out. We found that the nitric acid concentration dependency on trans-passive behavior of Zr was specific phenomenon in nitric acid.
