磁场作用下铁电极的不均匀阳极溶解  

Uneven Anodic Dissolution of Iron Induced by Magnetic Field

作　　者：吕战鹏[1] 黄德伦[1] 杨武[1] 

机构地区：[1]上海材料研究所,上海200437

出　　处：《电化学》2001年第3期326-331,共6页Journal of Electrochemistry

基　　金：国家自然科学基金 (5 98710 18);国家重点基础研究专项经费 (G19990 65 0 ) ;金属腐蚀与防护国家重点实验室 (990 0 4 )资助项目

摘　　要：采用电化学方法以及扫描电镜形貌观察研究了磁场对铁在硫酸溶液中的阳极溶解的影响 .恒电位极化测试结果表明 ,随外加阳极电位的增加 ,磁场的存在将加速阳极溶解 ,使振荡态或钝态变为活性溶解态 ,维持钝态 .于特定电位下与重力方向平行的电极表面两侧将因局部溶解加速而出现凹陷 .The effects of magnetic field on anodic dissolution of iron in sulfuric acid were studied by potentiostatic polarization measurements and scanning electron microscopy observation. Magnetic field would reduce the surface film coverage fraction on electrode by enhancing the film dissolution process, thus made the electrode prone to active dissolution state. With increasing the applied potentials, magnetic field would accelerate the anodic dissolution, change the oscillation state or passive state to active dissolution state, or maintain the passive state, respectively. Potential for onset of passivation moved in the noble direction when magnetic field was imposed. At specific anodic potentials, denting occurred on two sides of the electrode paralleling to the gravitation direction due to localized accelerated dissolution induced by magnetic field. Uneven dissolution of iron in the presence of magnetic field was related to the relative configuration between magnetic field direction and the electrode surface , and the special concentration gradient at the electrode circumferential area.

关 键 词：铁 磁场 恒电位阳极极化 不均匀溶解 钝化 腐蚀 铁电极 电化学方法 

分 类 号：O646[理学—物理化学]