酸度和氯离子浓度对工业纯铁腐蚀的促进作用机制研究

用近稳态方法测取了铁在不同酸度和不同氯离子浓度下的极化曲线,获得了酸度和氯离子浓度对腐蚀参数的影响数据。结果表明,在本工作所选的介质条件下,氯离子在表观上不影响铁的阳极溶解反应,对阴极析氢有促进作用。酸度的升高对阳极过程有促进作用。据此提出了阳极溶解和阴极析氢过程的反应机制,得到析氢反应的速率控制步骤是Volmer反应。

THE MECHANISM RESEARCH OF CORROSIVE PROMOTIONOF H~+AND CI~-ON IRON

The polarization curves of iron in the solutions with diffirent concentrations ofH+ and CI-- are measured. The corrosion parameters of iron are obtained. It is showed that,inthe solutions with high concentrations of H+ and CI--, the anodic process of iron is not apparentlyaffected by CI--, and it can accelerates the HER of cathodic process as increasing itS concentrations. H+ can accelerate the anodic process of iron as increasing itS concentrations.The mechanismof anodic process and HER process are suggested,the r. d. s of HER is Volmer reaction.