Dynamic Electrochemical Impedance Spectroscopy를 이용한 스테인리스 강의 계면 저항 분석

• Published in: 대한금속·재료학회지, 47(10) pp. 644 - 651
• Main Authors: 허정호, 이용헌, 신헌철
• Format: Journal Article
• Language: Korean
• Published: 대한금속·재료학회 01.10.2009
• Subjects: 재료공학
• ISSN: 1738-8228; 2288-8241

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 a 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% H2SO4 solution. KCI Citation Count: 1