CPEを含む伝送線モデルを用いたインピーダンス解析による黄銅の脱亜鉛腐食深さ評価法の開発

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  • 星 芳直
    名古屋工業大学　大学院工学研究科　物理工学専攻
  • 西原 佳宏
    東京理科大学　大学院理工学研究科　先端化学専攻
  • 四反田 功
    東京理科大学　理工学部　先端化学科
  • 板垣 昌幸
    東京理科大学　理工学部　先端化学科

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タイトル別名
  • Development of A Method to Evaluate Dezincification Corrosion Depth of Brass by Impedance Analysis Using Transmission Line Model Involving CPE
  • CPE オ フクム デンソウセン モデル オ モチイタ インピーダンス カイセキ ニ ヨル オウドウ ノ ダツアエン フショク フカサ ヒョウカホウ ノ カイハツ

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抄録

<p>A transmission line model involving constant phase element（CPE）was applied to the impedance analysis of brass in order to evaluate dezincification corrosion depth of brass. The brass after susceptibility test of dezincification corrosion（Brass–sdc）for arbitrary time was used for the impedance measurement. The impedance spectrum of Brass–sdc showed a locus in the high frequency range and a part of loop in the low frequency range. As the distributed constant region and lumped constant region were observed in the impedance spectrum, the impedance at transition frequency could be determined. Because the angle composed of locus in the high frequency range and real axis on the Nyquist plane became small due to the current distribution related to the growth of porous copper rich layer on the brass surface, it is difficult to determine the impedance at transition frequency in the impedance spectrum. In the present study, we employed the transmission line model involving CPE to the impedance analysis of Brass–sdc in order to determine the impedance at transition frequency in the impedance spectrum. The evaluation method for dezincification corrosion depth from impedance at transition frequency in the impedance spectrum of brass was discussed.</p>

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