516 超臨界水環境でのNi基合金の腐食に及ぼすCr,Mo,SiおよびAlの影響(一般講演(材料))

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Supercritical water oxidation (SCWO) is a promising and effective method for the oxidation of organic wastes. 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 the most materials have been observed as a result of the producing hydrochloric acid (HCl). 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, to use Ni-base alloy for a reactive container, the material to be used must be selected and constructed with the influence of the alloy element on corrosion in relation to a super critical water environment. Ni-Cr alloys, the Cr content to 25 and 30 mass%, was composed of Cr_2O_3 on the surface and which also admitted a high corrosion resistance. Ni-Cr alloys pitting was mitigated corrosion by adding Mo. In Ni-Cr-Al alloys, the Al content increased up to 3 mass%, which was composed of Al_2O_3.
社団法人日本機械学会の論文
2007-11-16