Takafumi Motooka
Japan Atomic Energy Research Institute
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Publication
Featured researches published by Takafumi Motooka.
Journal of Nuclear Science and Technology | 2002
Takafumi Motooka; Kiyoshi Kiuchi
We have studied corrosion of a stainless steel in nitric acid solution containing neptunium. Using type 304L stainless steel, corrosion tests in boiling neptunium nitrate solution were conducted under immersion and heat-transfer condition. By the weight loss measurement of stainless steel and the quantitative analysis of metallic ions dissolved in solution, the corrosion rates of stainless steel were obtained. The surface morphology was observed by scanning electron microscopy. The corrosion acceleration mechanism was investigated by polarization measurement and spectrophotometry. The corrosion rate of stainless steel was accelerated by addition of neptunium in nitric acid solution. Preferential intergranular corrosion was observed. The corrosion of stainless steel was promoted under heat-transfer condition compared to immersion condition. In polarization measurements, the cathodic over-voltage was decreased; the cathodic current was increased by addition of neptunium. Spectrophotometric measurements showed the oxidization of neptunium in boiling nitric acid. The corrosion mechanism in nitric acid solution containing neptunium suggested the re-oxidation of neptunium.
Zairyo-to-kankyo | 2008
Takafumi Motooka; Masahiro Yamamoto
Zairyo-to-kankyo | 2010
Takafumi Motooka; Chiaki Kato; Masahiro Yamamoto
Zairyo-to-kankyo | 2014
Atsushi Komatsu; Takafumi Motooka; Masashi Makino; Kimihiro Nogiwa; Fumiyoshi Ueno; Masahiro Yamamoto
Atomic Energy Society of Japan | 2012
Takafumi Motooka; Tomonori Sato; Masahiro Yamamoto
Archive | 2007
Fumiyoshi Ueno; Chiaki Kato; Takafumi Motooka; Masahiro Yamamoto; Shiro Ichikawa
Zairyo-to-kankyo | 2014
Takahiro Igarashi; Atsushi Komatsu; Takafumi Motooka; Fumiyoshi Ueno; Yoshiyuki Kaji; Masahiro Yamamoto
223rd ECS Meeting (May 12-17, 2013) | 2013
Takafumi Motooka; Atsushi Komatsu; Takashi Tsukada; Masahiro Yamamoto
Materials Transactions | 2002
Takafumi Motooka; Kiyoshi Kiuchi
PRiME 2016/230th ECS Meeting (October 2-7, 2016) | 2016
Masahiro Yamamoto; Chiaki Kato; Takafumi Motooka; Yasutoshi Ban; Fumiyoshi Ueno
