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IN-SITU IMPEDANCE INVESTIGATION OF 304 STAINLESS STEEL BETWEEN PIT GROWTH AND REPASSIVATION STATE |
ZHANG Shenghan, TAN Yu, LIANG Kexin |
School of Environmental Science and Engineering, North China Electric Power University, Baoding 071003 |
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Abstract Pitting corrosion investigations of 304 stainless steel in 0.1 mol/L sodium chloride borate buffer solution have been investigated by dynamic electrochemical impedance spectroscopy (DEIS). The electric equivalent circuit of the classic double-layer structure has been proposed to evaluate the changes of EIS data. According to the fitting results, the outer-layer of passive film of 304 stainless steel is highly destroyed during pitting process and can not return to the original condition. However, during repassivation process the inner-layer can be repassivated entirely. An active controlled model of film breakdown was proposed to analysis the film between the pit initiation and repassivation states.
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Received: 07 September 2010
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Corresponding Authors:
TAN Yu
E-mail: lucifertan@163.com
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