1414 超臨界水環境でのNi-Cr合金の腐食に及ぼすAlおよびSiの影響(G04-2 機械材料・材料加工(2),21世紀地球環境革命の機械工学:人・マイクロナノ・エネルギー・環境)

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Supercritical water oxidation (SCWO) is expected as a potential solution decomposition of organic waste, such as PCB and Dioxin. Its high solubility for organic compounds and its special physical properties (i.e., density and viscosity) result in a key advantage over standard processes such as incineration. During oxidation of chlorine organics, severe corrosion attack of most of the materials have been observed as a result of the formation of hydrochloric acid (HC1). While Ni-based alloys are generally considered important for severe service applications, results from laboratory in operation indicate that they will not withstand some aggressive feeds. Therefore, Corrosion control of structural materials is key issue in the applications of supercritical water oxidation to such chemical process. In Ni Cr alloys, the Cr content to 25 and 30 mass% in mass, which was composed of Cr_2O_3 on the surface and which also admitted a high corrosion resistance for 5.0%HC1. In Ni-Cr-Al alloys,the Al content increased up to 3 mass% in mass, which was composed of Al_2O_3, and internal oxidation was controlled.
社団法人日本機械学会の論文
2008-08-02