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| EFFECT OF SIZE ON CORROSION BEHAVIOR OF MICRO-ELECTRODES |
| HUANG Wenjing; HUANG Hualiang; QIU Yubing; CHEN Zhenyu; GUO Xingpeng |
| Hubei Key Laboratory of Materials Chemistry and Service Failure; School of Chemistry and Chemical Engineering; Huazhong Univesity of Science and Technology; Wuhan 430074 |
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Abstract Effect of size on corrosion behavior of 304 stainless steel micro-electrodes was investigated using electrochemical methods (including potentiodynamic polarization curves, electrochemical impedance spectroscopy (EIS), and electrochemical noise (ECN)). The results of potentiodynamic polarization and EIS indicated there is a non-linear relationship between the limiting diffusion current density and the area of electrode. The limiting diffusion current density, the corrosion current density and the double-layer capacitance increased with decreasing the electrode size. On the other hand, the corrosion potential negatively shifted and the solution resistance decreased with the decrease of electrode size. The results of ECN demonstrated that there is a critical size for metastable pitting, the frequency of metastable pitting reduced obviously with the decrease of electrode size.
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Received: 27 October 2009
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Corresponding Authors:
GUO Xingpeng
E-mail: guoxp@mail.hust.edu.cn
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