学術雑誌論文 機能性被覆の性状とインピーダンス応答の関係を用いたin-situ 評価

鈴木, 成実  ,  Suzuki, Narumi  ,  松村, 義人  ,  Matsumura, Yoshihito  ,  近藤, 正聡  ,  Kondo, Masatoshi

80 ( No. 9 )  , pp.585 - 592 , 2016-06 , 日本金属学会
内容記述
The characterization of Zr oxide layer formed in Ar and O2 gas mixture at 973 K on the surface of Zr metal was characterizedby electrochemical impedance spectroscopy (EIS). The increase of the layer thickness and the formation of the horizontal crackin the layer were evaluated insitu using EIS. The thickness of the Zr oxide layer estimated by EIS agreed well with that byEPMA analysis. It was found that the time constant t of the Zr oxide layer obtained by the EIS increased with the oxidation time.This trend indicated the growth of horizontal crack. The constant phase element (CPE) parameter p was obtained from theresults of EIS. The change of p indicated that the Zr oxide layer has the gradient of the chemical composition in its thickness direction.The single horizontal crack and compositionally gradient in the oxide layer was modeled as they electrically functioned in theequivalent circuits. The simulation results indicated that the EIS method can be used as the insitu monitor the gradient of thechemical composition and the crack formation in the oxide layer.

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