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熱化学法水素製造プロセス環境下における構造材料腐食層の力学特性評価

Mechanical property evaluation of surface layer corroded in thermochemical-hydrogen-production process condition

二川 正敏; 久保 真治; 涌井 隆*; 小貫 薫; 清水 三郎; 山口 明久*

Futakawa, Masatoshi; Kubo, Shinji; Wakui, Takashi*; Onuki, Kaoru; Shimizu, Saburo; Yamaguchi, Akihisa*

熱化学法水素製造ISプロセス環境下で構造材料に形成される腐食層の力学特性を評価した。まず、4種類の金属材料(316SS,Ni-Alloy,Ti及びTa)に対して、ISプロセスのヨウ化水素分解環境を想定した条件下で100時間の腐食試験を行った結果、316SSは腐食層を形成し、Tiは粒内に水素脆化が確認されず、良好な耐食性を示すことを確認した。腐食層の評価には、微小押し込み試験法から得た押込み荷重と深さの関係に対して、逆解析を行い、ヤング率,降伏応力,加工硬化係数,加工硬化指数の変化を評価した。これより、Taについては、表層約200ミクロンまでの厚さにおいて延性の低下を示し、最大引張強度の増加及び均一伸びの減少を示すことがわかった。

Micro-indentation technique was applied to evaluate the mechanical properties of corroded surface layers of Ni-alloy, 316SS, Ti and Ta, which were exposed into the corrosive gaseous environment consisting of HI+I$$_{2}$$+H$$_{2}$$O+H$$_{2}$$. The corrosion condition was chosen so as to simulate one of the environments in the thermochemical hydrogen production, IS process, where the degradation due to the corrosion attack by HI and the hydrogen embrittlement is a key issue from the viewpoint of material integrity. The micro-indentation tests using a spherical indenter and the inverse analysis with Kalman filter were performed to quantitatively estimate material constants of corroded surface layer. Ni-alloy exhibited good corrosion resistance and Ta was remarkably influenced by the hydrogen embrittlement.

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