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

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.