物理化学学报 >> 1988, Vol. 4 >> Issue (04): 382-386.doi: 10.3866/PKU.WHXB19880411

研究论文 上一篇    下一篇

酸性溶液中氯离子对铁的钝化膜的破坏

陈晓; 陈慎豪; 蔡生民   

  1. 山东大学化学系; 北京大学化学系
  • 收稿日期:1987-01-06 修回日期:1987-07-06 发布日期:1988-08-15
  • 通讯作者: 陈晓

BREAKDOWN OF THE PASSIVE FILM ON IRON BY Cl~- IN ACIDIC SOLUTION

Chen Xiao; Chen Shenhao;
Cai Shengmin   

  1. Department of Chemistry; Shandong University
    Department of Chemistry; Peking University
  • Received:1987-01-06 Revised:1987-07-06 Published:1988-08-15
  • Contact: Chen Xiao

摘要: 0.5 mol L~(-1)H_2SO_4溶液中高纯铁电极在短时间阳极钝化后再向阴极方向扫描时可测出阴极还原电量, 这主要是由于氧化膜的还原引起的, 极少量Cl~-能使阴极还原电量明显减少。Cl~-的主要作用是阻滞钝化膜的形成并使钝化膜稳定性下降。

Abstract: The coulombs of cathodic reduction can be measured when the high pure iron electrode passivated first in 0.5 mol L~(-1) H_2SO_4 for ten minutes was swept towards the cathodic direction. It is mainly due to the reduction of oxide film on the surface. A very small amount of Cl~- can obviously decrease the reduction current. The primary effect of Cl~- is its arreting the formation of passive film and reducing the stability of the passive film.