物理化学学报 >> 2005, Vol. 21 >> Issue (10): 1096-1101.doi: 10.3866/PKU.WHXB20051007

研究论文 上一篇    下一篇

咪唑啉酰胺在电偶电极表面的吸附行为

艾俊哲; 郭兴蓬; 屈钧娥; 陈振宇   

  1. 华中科技大学化学系, 武汉 430074
  • 收稿日期:2005-01-18 修回日期:2005-04-15 发布日期:2005-10-15
  • 通讯作者: 郭兴蓬 E-mail:guoxp@mail.hust.edu.cn

Adsorption Behavior of Imidazoline Amide on the Surface of Galvanic Electrode

AI Jun-zhe; GUO Xing-peng; QU Jun-e; CHEN Zhen-yu   

  1. Department of Chemistry, Huazhong University of Science and Technology, Wuhan 430074
  • Received:2005-01-18 Revised:2005-04-15 Published:2005-10-15
  • Contact: GUO Xing-peng E-mail:guoxp@mail.hust.edu.cn

摘要: 采用原子力显微镜技术研究了有机阳离子缓蚀剂(咪唑啉酰胺)在电偶电极表面的吸附行为, 并探讨了其腐蚀抑制机理. 结果表明, 金属表面的过剩电荷较大地影响缓蚀剂分子的吸附行为. 在1%的NaCl溶液中, 碳钢电极表面带有过剩的负电荷;不锈钢电极表面带有过剩的正电荷;碳钢电极和不锈钢电极耦合后, 其表面分别带有过剩的正电荷和负电荷. 在耦合前阳离子缓蚀剂分子仅吸附在碳钢表面, 耦合后缓蚀剂分子在偶对的阴极(不锈钢)和阳极(碳钢)表面均有吸附, 但缓蚀剂分子在碳钢表面的吸附强度和覆盖度较之耦合前降低, 缓蚀剂的腐蚀抑制能力减弱.

关键词: 原子力显微镜, 电化学方法, 吸附行为, 表面过剩电荷, 缓蚀剂, 电偶腐蚀

Abstract: The adsorption behavior of imidazoline amide as a cationic inhibitor for inhibiting galvanic corrosion has been investigated by using electrochemical methods and atomic force microscopy (AFM) technology. The results show that the adsorption behavior of the inhibitor is significantly affected by the excess charge on the metal surface. Carbon steel and stainless steel carry negative and positive excess charges when they are immersed in 1% NaCl solution, respectively. The inhibitor adsorbs on the surface of carbon steel, while it does not adsorb on the surface of stainless steel in aqueous NaCl solution. When the two metals are electrically coupled in NaCl solution, positive and negative excess charges are carried on the carbon steel and the stainless steel, respectively. The inhibitor can adsorb on the surfaces of both carbon steel and stainless steel. However, in this case, the surface coverage of the inhibitor film formed on the carbon steel decreases compared with that on the surface of single carbon steel, and the adsorbability of the inhibitor on the surface of carbon steel is weakened.

Key words: Atomic force microscopy, Electrochemical method, Adsorption behavior, Surface excess charge, Inhibitor, Galvanic corrosion