Protective Oxide Film on Alloy X750 Formed in Air at 973K.
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概要
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An effective pre-oxidation method for Alloy X750 was developed to reduce general corrosion in an oxygenated aqueous environment such as in BWR core water. The optimum condition of preoxidation in air at elevated temperatures was found to be 520 h at 973 K by considering the allowance condition of heat treatment for age-hardening. <BR>Some characteristics of the corroded oxide film have been clarified by surface analyses with XMA, SIMS, AES, XPS etc. The film was composed of double oxide layers, namely a highly crystallized NiFe<SUB>2</SUB>O<SUB>4</SUB> outer layer and a high Cr<SUB>2</SUB>O<SUB>3</SUB> content inner layer. The passive property of the film has been recognized to be due to the nature of the oxides whereby NiFe<SUB>2</SUB>O<SUB>4</SUB> restricts the dissolution of metals because of its low solubility and Cr<SUB>2</SUB>O<SUB>3</SUB> restricts the diffusion of metal ions because of its high binding energy and low diffusion coefficient.
著者
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HEMMI Yukio
Nuclear Engineering Laboratory, Toshiba Corp.
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ICHIKAWA Nagayoshi
Nuclear Engineering Laboratory, Toshiba Corp.
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SAITO Norihisa
Nuclear Engineering Laboratory, Toshiba Corp.
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MASUDA Takahisa
Energy System Group, Toshiba Corp.
関連論文
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