利用稳态恒电流极化曲线测量研究了纯铁在除氧的SCN~-+NaClO_4及SCN~-+Na_2SO_4体系中(总离子强度1N)的腐蚀电化学行为。结果表明,铁在这两种体系中的腐蚀电化学行为相同。SCN~-在低浓度的情况下(C_(SCN)-≤0.05N),同时阻滞铁的阳极溶解及阴极析氢过程;SCN~-在较高的浓度下(C_(SCN)->0.1N)作为促进剂参与铁的阳极溶解过程,而阻滞阴极析氢过程。OH~-对铁的阳极溶解起促进作用。得到了铁在不同浓度的SCN~-范围内的阳极溶解及阴极析氢过程的动力学经验方程,提出了相应的反应机理。
The effect of thiocyanate ion on the electrochemical behavior of armc6 iron in deoxygenated acidic perchlorate and sodium sulphate solutions(total ionic strength 1N) has been investigated by means of galvanostatic polarization measurements under steady-state conditions. The results of investigations show that the electrochemical behavior of iron in perchlorate solutions in the absence and presence of SCN~- is identical with that obtained in the corresponding sodium sulphate solutions. In different SCN"-concentration ranges thiocyanate ion exerts quite different influence on the electrochemical behavior of iron. At low SCN"-concentration range(C_(SCN~-≤0.05N) thiocyanate ion inhibits both iron anodic dissolution and hydrogen evolution reactions, in higher SCN~-- concentration solutions(C_(SCN~-≥0.lN) thiocyanate ion acts as an accelerator for iron anodic dissolution but impedes hydrogen evolution process on iron electrode. Kinetic models which may elucidate the experimental results are proposed.
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