磁场和CI^-对铁在中性Na_2SO_4溶液中阳极极化行为的影响

EFFECT OF MAGNETIC FIELD AND Cl^- ON ANODIC POLARIZATION BEHAVIOR OF IRON IN NEUTRAL 0.5mol/LNa_2SO_4 SOLUTION

用动电位扫描法研究了外加磁场及Cl^-对铁在中性0.5mol/LNa_2SO_4溶液中阳极极化行为的影响。结果表明:有、无磁场下铁在含Cl^-的Na_2SO_4溶液中的阳极极化曲线都呈现活化-钝化-过钝化特征,虽然Cl^-会阻碍钝化膜的形成过程;外加磁场使E_p和E_F正移并增大i_(max)和i_(min),使钝化区范围缩小。Cl^-与磁场同时存在时对钝化膜的破坏有协同作用。

The effect of magnetic feild and Cl- on anodic polarization behavior of iron in neutral 0.5mol/L Na2so4 solution was studied using potentiodynamic method. It was shown that iron in Na2SO4+Cl-solution exhibited active- passive-transpassive characteristics in the presence or absence of magnetic field, although Cl- in the solution would hinder the formation of passive layer. The applied magnetic field would cause shift of passivation potential Ep and flade potential EF towards noble direction, increase the critical current density for passivation imax and the passive current density imin, and narrow the passive region. A synergistic effect of imposed magnetic field and Cl- on breakdown of the passive layer was reported.