尺寸效应对微电极腐蚀行为的影响

中国腐蚀与防护学报

2010, Vol. 30

Issue (2): 141-144

会议论文

本期目录 | 过刊浏览

尺寸效应对微电极腐蚀行为的影响

黄文静;黄华良;邱于兵;陈振宇;郭兴蓬

华中科技大学化学与化工学院材料化学与服役失效湖北省重点实验室武汉 430074

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

全文: PDF(958 KB)

摘要:

采用动电位极化、交流阻抗(EIS)和电化学噪声(ECN)等电化学方法研究了304不锈钢微电极的腐蚀行为。实验结果表明：极限扩散电流密度与电极尺寸之间具有非线性关系，随着电极面积的减小，极限扩散电流密度增大，溶液阻抗减小，双电层电容增大，自腐蚀电位负移，腐蚀电流密度增大。电化学噪声谱表明，随着电极面积减小，亚稳态点蚀噪声峰的频度降低，亚稳态点蚀的发生存在一个临界尺寸。

关键词 ： 304不锈钢, 微电极, 尺寸效应, 动电位极化, 电化学阻抗, 电化学噪声

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.

Key words： 304 stainless steel micro-electrode size effect potentiodynamic polarization EIS ECN

收稿日期: 2009-10-27

ZTFLH:

TG 174

基金资助:

国家自然科学基金项目（50671040, 50871044）资助

通讯作者: 郭兴蓬 E-mail: guoxp@mail.hust.edu.cn

Corresponding author: GUO Xingpeng E-mail: guoxp@mail.hust.edu.cn

作者简介: 黄文静，女，1984年生，硕士生，研究方向金属材料的腐蚀失效与防腐

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引用本文:

黄文静;黄华良;邱于兵;陈振宇;郭兴蓬. 尺寸效应对微电极腐蚀行为的影响[J]. 中国腐蚀与防护学报, 2010, 30(2): 141-144.
GUO Xin-Peng. EFFECT OF SIZE ON CORROSION BEHAVIOR OF MICRO-ELECTRODES. J Chin Soc Corr Pro, 2010, 30(2): 141-144.

链接本文:

https://www.jcscp.org/CN/ 或 https://www.jcscp.org/CN/Y2010/V30/I2/141

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