磁场作用下铁在盐酸和氯化钠溶液中自腐蚀状态的变化

MAGNETIC FIELD INDUCED VARIATION OF OPEN CIRCUIT STATE OF IRON IN CHLORIDE SOLUTIONS

采用自腐蚀电位测量及恒电位极化法研究了磁场对铁在酸性与中性氯化物溶液中自腐蚀状态的作用。外加磁场使自腐蚀电位正移 ,撤去磁场使自腐蚀电位负移。没有磁场时在自腐蚀电位下极化然后外加磁场会导致磁致阴极电流 ;有磁场时自腐蚀电位下极化然后撤去磁场会导致磁致阳极电流。酸性溶液体系的磁致阴极电流值明显大于中性溶液体系 。

Effects of magnetic field on the open circuit state of iron in acidic or neutral chloride solutions were studied by electrode potential measurements and potentiostatic polarization with magnetic field perturbation. Open circuit potential ( E corr or E c) moved toward the positive direction after imposing magnetic field, and E corr moved toward the negative direction after withdrawing magnetic field. When iron was potentiostatically polarized at the open circuit potential without magnetic field, a cathodic current was observed after imposing magnetic field. An anodic current was detected after withdrawing magnetic field for iron potentiostatically polarized at the open circuit potential with magnetic field. Magnetic field induced cathodic current was larger in acidic solution than in neutral solution, supporting the evidence that magnetic field affected the open circuit state mainly by accelerating the cathodic hydrogen evolution reaction.