化学学报 ›› 1989, Vol. 47 ›› Issue (12): 1146-1151. 上一篇    下一篇

研究论文

碳钢钝化膜在碳酸盐溶液中的阴极还原机理

林志成;黎明   

  1. 湖南大学化学化工系
  • 发布日期:1989-12-15

The cathodic reduction mechanism of passive film on mild steel in carbonate solution

LIN ZHICHENG;LI MING   

  • Published:1989-12-15

本文采用动电位和恒电流技术研究了pH8.31-11.37的酸盐缓冲溶液中, 低碳钢钝化膜的阴极还原机理。认为钝化膜的还原与溶液pH值密切相关, 当8.31≤pH≤9.80时, Fe~2O~3还原为Fe用FeOH^+;当9.80

关键词: 碳酸盐, 碳酸钠, 铁化合物, 还原反应, 低碳钢, 恒电位器, 碳酸氢钠, 钝化膜, 阴极效应

The cathodic reduction of passive films on mild steel was investigated by using the potentiodynamic and galvanostatic techniques in carbonate-bicarbonate buffer solns. at various pH values. The reduction strongly depends on the pH of the solns. At 8.31 ?pH ?9.80, ferric oxide was simultaneously reduced to Fe and FeOH+; while at 9.80 ?pH ?11.37, ferric oxide was reduced to magnetite and Fe(CO3)22-. Both these reactions consisted of a no. of steps, and the rate-detg. step was the charge transfer reaction from FeOH2+ to (FeOH)ads.

Key words: CARBONATE, SODIUM CARBONATE, IRON COMPOUNDS, REDUCTION REACTION, LOW CARBON STEEL, POTENTIOSTAT, SODIUM BICARBONATE, PASSIVATION FILMS, CATHODE EFFECT

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