物理化学学报 >> 2002, Vol. 18 >> Issue (11): 1023-1028.doi: 10.3866/PKU.WHXB20021113

研究简报 上一篇    下一篇

磷酸溶液中DDA在锌表面的吸附及其缓蚀作用

木冠南;刘光恒;张瑾   

  1. 云南大学化学系,昆明 650091
  • 收稿日期:2002-01-04 修回日期:2002-04-12 发布日期:2002-11-15
  • 通讯作者: 木冠南 E-mail:guannan@public.km.yn.cn

Adsorption of DDA in Phosphoric Acid Solution on Zinc Surface and Its Corrosion Inhibition

Mu Guan-Nan;Liu Guang-Heng;Zhang Jin   

  1. Department of Chemistry, Yunnan University, Kunming 650091
  • Received:2002-01-04 Revised:2002-04-12 Published:2002-11-15
  • Contact: Mu Guan-Nan E-mail:guannan@public.km.yn.cn

摘要: 采用失重法及电化学法研究了锌在含或不含十二烷基胺(DDA)的磷酸溶液中的腐蚀作用,得出相应的动力学方程,求得有关的动力学及热力学参数.用光电子能谱(XPS)检测发现,在40~70 ℃区间,锌在磷酸溶液中生成Zn(OH)x覆盖层,表现出较强的自缓蚀效果,而在30~40 ℃区间,因DDA以及, 等微粒同时吸附在锌表面,DDA在磷酸溶液中表现出较强的缓蚀作用.用吸附理论讨论了这种缓蚀作用产生的原因.

关键词: 锌, 磷酸, 十二烷基胺(DDA), 吸附, 缓蚀作用

Abstract: The weight-loss and electrochemical methods were used to investigate the corrosion behavior of metallic zinc in phosphoric acid solutions with or without dodecyl amine(DDA). The corrosion rate expressions were formulated and the corresponding kinetic parameters and thermodynamic constants were calculated. From the results of electron spectroscopy for chemical analysis (XPS), it was found that, over the temperature range of 40~70 ℃, zinc showed good self corrosion inhibition due to the coverage of Zn(OH)x produced. On the other hand, in the temperature range of 30~40 ℃, since DDA-H3PO4 and several other compounds were adsorbed on zinc surface, DDA exhibited powerful corrosion inhibition. The mechanism for corrosion inhibition was discussed by the adsorption theory.

Key words: Zinc, Phosphoric acid, Dodecyl amine (DDA), Adsorption, Corrosion inhibition