Corrosion of austenitic stainless steel by molten Cs2O3-CsO2.
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概要
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Corrosion of Type 304 stainless steel by molten Cs<SUB>2</SUB>O<SUB>3</SUB>-CsO<SUB>2</SUB> has been investigated at 690 and 800°C. The Cs<SUB>2</SUB>O<SUB>3</SUB>-CsO<SUB>2</SUB> mixture was selected as corroding agent in order to clarify the corrosion behavior of stainless steel at a considerably high oxygen potential. At the initial stage a uniform Fe<SUB>3</SUB>O<SUB>4</SUB> layer is formed and is then removed. After the removal of the oxide film intergranular penetration proceeds into the alloy substrate. Chromium-containing oxides are formed as corrosion products at the grain boundaries. After the grain boundary penetration has continued for a while, a Cr-depleted surface alloy layer is formed, which blocks further progressing of the intergranular penetration. Then, this Cr-depleted layer is detached, inducing the restart of the intergranular pene-tration. Compared to the reported intergranular penetration rates of stainless steel due to Cs<SUB>2</SUB>O-Cs<SUB>2</SUB>O<SUB>2</SUB>, those due to Cs<SUB>2</SUB>O<SUB>3</SUB>-CsO<SUB>2</SUB> obtained in this study were generally lower, and changed in a more complicated fashion with time.
- 一般社団法人 日本原子力学会の論文
著者
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Kanno Masayoshi
Department Of Applied Chemistry Tokyo Metropolitan University
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yamawaki Michio
Research Center for Nuclear Science and Technology, University of Tokyo
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KISHIDA Kazuo
Graduate School, University of Tokyo
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