Abstract
All types of the magnetic field effects on the anodic dissolution of metallic materials have been found in one electrochemcial system: the Ni/0.40 M HNO 3 + 5.0 mM NaCl system. The effects are similar to those of a stirring on all occasions. With the presence of the magnetic field, the current decreases in the active region. However, the current oscillations are changed to active dissolution in the prepassive region and induced in the transitive potential from the prepassive region to the passive region by the magnetic field. In the passive region, the magnetic field has little influence. Those effects are discussed with different rate-determining steps. The study of the effects of the magnetic field on this system may help us understand why the magnetic field enhances the corrosion rates in some conditions while suppressing them in others.
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