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Corrosion test of metallic materials in high temperature acidic environments of IS process

ISプロセス高温強酸環境における金属材料の耐食性試験

田中 伸幸; 長江 正寛*; 井岡 郁夫; 岩月 仁; 久保 真治; 小貫 薫

Tanaka, Nobuyuki; Nagae, Masahiro*; Ioka, Ikuo; Iwatsuki, Jin; Kubo, Shinji; Onuki, Kaoru

熱化学水素製造法ISプロセスの耐食材料研究の一環として、硫酸及びヨウ化水素酸の高温強酸環境における新規な金属材料の耐食性試験を実施した。硫酸環境では、Mo及びMo合金の窒化物に対して90wt%硫酸を用いて300$$^{circ}$$Cの浸漬試験を行った。本試験では十分な耐食性を示す試験片はなかったが、合金化することで耐食性が向上させることが可能であることを明らかにした。ヨウ化水素酸環境では、Nb-W合金に対して、200$$^{circ}$$Cの浸漬試験を行った。腐食速度は浸漬時間とともに十分な耐食性である0.1mm/y以下まで減少することを見いだした。

The Thermochemical water-splitting cycle IS process constitutes severe environments to the materials of construction because of the corrosive chemicals. This paper discusses corrosion resistance of novel metallic materials in high temperature sulfuric and hydriodic acid. As for the sulfuric acid environment, corrosion resistances of MoN, Mo-Ta-N, and Mo-Cr-N alloys were examined. The experiments were performed for the duration of 5 hour in 90wt% sulfuric acid at 300$$^{circ}$$C. Although no material showed satisfactory corrosion resistance (ca. 1.5 mm/y in the case of MoN), the addition of Ta or Cr was found to be effective to improve the corrosion resistance. As for the hydriodic acid environment, corrosion resistance of Nb-W alloy was examined by immersing the test pieces for up to 100 hours in the test solutions of 200$$^{circ}$$C. It was observed that the corrosion rates lowered with the progress of immersion time and reached to a stable value of lower than 0.1 mm/y.

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