磁场对铁在不同电位高氯酸钠溶液中阳极溶解的影响

Effect of Magnetic Field on Anodic Dissolution of Iron in Sodium Perchlorate Solution at Different Potentials

在不同磁场条件的0.1mol/L NaClO4溶液中对铁阳极进行了动电位极化和恒电位极化,研究了磁场对铁阳极溶解的影响。结果表明:磁场使铁的开路电位正移,降低了极化曲线低电位区的电流密度,增大了高电位区的电流密度和阳极极化曲线线性段的斜率;恒电位极化时,低电位下磁场的作用与施加磁场的顺序有关,在高电位下磁场会增大电流密度,与动电位极化曲线的结果一致;磁场作用下高速溶解后铁电极表面出现月牙形局部腐蚀形貌。

Potentiodynamic polarization and potentiostatic polarization were carried out to anode of iron in 0.1 mol/L NaClO4 solution and different magnetic fields,in order to study the effect of magnetic field on the anodic dissolution.The results show that magnetic field shifted the open circuit potential(OCP)of iron in positive direction,decreased the current density in the low potential region of the polarization curves,and increased the current density in the high potential region and the slope of linear section in anodic polarization curves.The effect of magnetic field was related to the sequence of applying magnetic field at low potentials in potentiostatic polarization,and magnetic field could increase the current density at high potentials,which was consistent with the result of potentiodynamic polarization curves.Localized corrosion morphology with cresent-shape was observed on the surface of electrodes after high-rate dissolution in the action of magnetic field.