物理化学学报 >> 2008, Vol. 24 >> Issue (12): 2275-2281.doi: 10.3866/PKU.WHXB20081221

研究论文 上一篇    下一篇

黄铜-16Mn钢在氯化钠溶液中腐蚀电化学的分布行为

皇甫淑君, 王佳, 韩霞, 胡杰珍, 郑莹莹   

  1. 中国海洋大学化学化工学院, 山东 青岛 266100; 中国科学院金属研究所, 金属腐蚀与防护国家重点实验室, 沈阳 110016; 山东赛瑞石油科技发展有限公司, 山东 东营 257237
  • 收稿日期:2008-07-23 修回日期:2008-09-18 发布日期:2008-12-04
  • 通讯作者: 王佳 E-mail:jwang@ouc.edu.cn

Electrochemical Distribution Behavior of the Galvanic Corrosion of Brass-16Mn Steel Couple in Aqueous NaCl Solution

HUANGFu Shu-Jun, WANG Jia, HAN Xia, HU Jie-Zhen, ZHENG Ying-Ying   

  1. College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, Shandong Province, P. R. China; State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, P. R. China; 3Shandong SERI Petrotech Development Co., Ltd, Dongying 257237, Shandong Province, P. R. China
  • Received:2008-07-23 Revised:2008-09-18 Published:2008-12-04
  • Contact: WANG Jia E-mail:jwang@ouc.edu.cn

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摘要： 使用扫描微电极技术研究了黄铜-16Mn钢电偶体系在不同浓度氯化钠溶液中表面电位和电流的分布情况. 研究发现, 表面电位和电流分布随溶液浓度和与连接点的距离而变化. 溶液浓度越大, 两者分布就越均匀; 与连接点距离越近, 电位极化就越大, 电流密度也越大. 腐蚀形貌观测也支持了电位和电流分布的结果. 实验结果表明, 在低浓度的溶液中, 电偶腐蚀会集中在连接点周围,造成严重的局部腐蚀. 随着溶液浓度增大, 腐蚀分布变得均匀.

关键词: 黄铜, 16Mn钢, 微电极, 电偶腐蚀, 电位分布, 电流分布

Abstract: A scanning microelectrode was used to measure the potential and current distributions on the metal surface of a brass-16Mn steel galvanic couple that was corroded in aqueous NaCl solutions with various concentrations. The potential and current distributions varied with the solution concentration and were also dependent on the distance from the brass-16Mn steel couple joint. These distributions were more symmetrical when the concentration of the solution was higher. The potential polarized greatly and the current density was larger near the couple joint. The potential and current distribution results were confirmed by surface observations of the corroded sample after the immersion test. Experimental results showed that corrosion was concentrated around the joint when solution concentration was low and was distributed more symmetrically as the solution concentration increased.

Key words: Brass, 16Mn steel, Micro-electrode, Galvanic corrosion, Potential distribution, Current distribution