高等学校化学学报 ›› 1986, Vol. 7 ›› Issue (2): 174.

• 研究简报 • 上一篇    下一篇

铬酸还原过程的阴极钝化膜性质研究

江琳才   

  1. 华南师范大学化学系
  • 收稿日期:1984-10-09 出版日期:1986-02-24 发布日期:1986-02-24

A Study on the Nature of the Cathodic Passivating Film in the Process of Reduction of Chromic Acid

Jiang Lincai   

  1. Department of Chemistry, South China Normal University, Guangzhou
  • Received:1984-10-09 Online:1986-02-24 Published:1986-02-24

摘要: 铬酸还原为铬的阴极过程中,基体表面会生成固相膜,从而出现阴极钝化现象[1-5]。我们在研究铬酸镀浓的电化学行为时,曾证实这种现象[6],本文报导的是对该钝化膜性质的研究结果。

Abstract: Atypical cathodic passivating phenomenon occurring at vitreous carbon electrode in the chromic acid solution was observed. At potentials after the cathodic reduction peak of Cr(Ⅵ) the potential sweep shows clear evidence for the formation of a strongly passivating film. It is confirmed that the presence of anions such as Cl-, NO3-, SiF42-, SO42- causes the reactivation of the electrode surface, though another narrow passivating region reappears at potential just prior to metal deposition. The nature of the passivating film was discussed.

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