Korean Journal of Metals and Materials (대한금속재료학회지)

The Korean Institute of Metals and Materials (대한금속재료학회)
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In-depth Investigation on Interfacial Resistance of Stainless Steel by Using Dynamic Electrochemical Impedance Spectroscopy

Dynamic Electrochemical Impedance Spectroscopy를 이용한 스테인리스 강의 계면 저항 분석

  • Heo, Jung-Ho (School of Materials Science and Engineering, Pusan National University) ;
  • Lee, Yong-Heon (Stainless Steel Research Group, POSCO) ;
  • Shin, Heon-Cheol (School of Materials Science and Engineering, Pusan National University)
  • 허정호 (부산대학교 재료공학부) ;
  • 이용헌 (포스코 기술연구소 STS 연구그룹) ;
  • 신헌철 (부산대학교 재료공학부)
  • Received : 2009.05.28
  • Published : 2009.10.25
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Abstract

The passivation (or deactivation) of a metal surface during oxide film formation has been quantitatively explored for a ferritic stainless steel by using dynamic electrochemical impedance spectroscopy (DEIS). For this purpose, the electrochemical impedance spectra were carefully examined as a function of applied potential in the active nose region of the potentiodynamic polarization curve, to separate the charge transfer resistance and oxide film resistance. From the discrepancy in the potential dependence between the experimental charge transfer resistance and the semi-empirically expected one, the degree of passivation could be quantitatively estimated. The sensitivity of passivation of the steel surface to anodic potential, which might be the measure of the quality of the oxide film formed under unit driving force or over-potential, decreased by 31% when 3.5 wt% NaCl was added to a 5 wt% $H_2SO_4$ solution.

Keywords

Acknowledgement

Supported by : POSCO

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