Corrosion of SUS316L in Super Critical Water Environments

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  • 超臨界水環境におけるオーステナイト系ステンレス鋼の腐食
  • チョウリンカイスイ カンキョウ ニ オケル オーステナイトケイ ステンレス コウ ノ フショク

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Abstract

  Water of 648K and 22.1MPa or more is called super critical water, and it has an excellent organic solvent characteristic. Recently, the application of supercritical water for various fields is being attempted. Especially, supercritical water oxidation is researched as an effective processing method of PCB and radioactive waste. However, metal corrodes in supercritical water environments, especially, reactive containers corrode conspicuously with hydrochloric acid generated in the processing of PCB. <br>  Therefore, corrosion is a serious problem in terms of the lifespan of the reactive container. <br>  Moreover, economical problems are also faced because hastelloy used in general is expensive. In this study, the corrosion behavior of 99.9%Fe, 99.9%Ni, 99.9%Cr and SUS316L was investigated in supercritical water at 523 to 873K and 20 to 60MPa for 3.6×103 to 5.22×105sec. Similar tests of surface treated specimens were carried out. As a result, the corrosion rate increased as the examination temperature increased in an materials. Moreover, transpassive corrosion was observed in Cr at 623K. The corrosion rate increased as pressure increased. Moreover, corrosion of metals in super critical water was influenced by the permittivity of water. Nitrided specimens showed excellent corrosion resistivity in super critical water environments.

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