有、无外磁场下铁在碳酸氢钠溶液中的阳极极化行为

ANODIC POLAIZATION BEHAVIOR OF IRON IN SODIUM BICARBONATE SOLUTIONS IN THE PRESENCE OR ABSENCE OF MAGNETIC FIELD

用动电位扫描法测得的有、无外磁场下纯铁在一系列（１×１０（－２）～１ｌｍｏｌ／Ｌ）ＮａＨＣＯ３溶液中３０℃下的阳极极化曲线表明：铁在ＮａＨＣＯ３中具有活化－钝化－过钝化特征；曲线有三种类型，从热力学看系由于ＮａＨＣＯ３浓度的变化导致在铁上发生不同的电化学反应的结果；外磁场不改变电化学反应机制，但会增大电流密度；由于磁场的作用与钝化膜的作用相互制约，在不同浓度的ＮａＨＣＯ３溶液中磁场的作用程度有所不同。

Anodic polarhation curves of iron in (0.01￣1 mol/L) NaHCO3 solution were measured using potentiodynamic method in the presence or absence of 0.4T magnetic field. It was shown that iron in these solution exhibited act ive-passive-transpassive characteristics. Three types of polarization curves obtaniedcould be explained thermodynamically on the assumption that the variation of NaHCO3 concentration caused different electrochemical reactions occurring on iron. Imposed magnetic field did not change the electrochemical reaction mechanism but would increase current density at the given potential. Interaction between the effect of magnetic field and the effect of passive film resulted in different efficiency of magnetic field in different concentrations of NaHCO3 solutions.