磁场对铁在磷酸溶液中不同电位下阳极电流的影响  

Effect of Magnetic Field on Anodic Current of Iron in Phosphoric Acid Solution at Various Potentials

作　　者：唐元杰 宁飞 张锟 董海英 吕战鹏[1,2] 蔡爽巍 凌思纯 马佳荣 崔同明 TANG Yuanjie;NING Fei;ZHANG Kun;DONG Haiying;Lü Zhanpeng;CAI Shuangwei;LING Sichun;MA Jiarong;CUI Tongming(Institute of Materials,School of Materials Science and Engineering,Shanghai University,Shanghai 200072,China;State Key Laboratory of Advanced Special Steel,Shanghai University,Shanghai 200072,China)

机构地区：[1]上海大学材料科学与工程学院材料研究所,上海200072 [2]上海大学省部共建特殊钢冶金与制备国家重点实验室,上海200072

出　　处：《腐蚀与防护》2021年第9期11-15,34,共6页Corrosion & Protection

基　　金：国家自然科学基金(51571183);国家重点研发计划(2017YFB0703002)。

摘　　要：采用极化曲线和恒电位极化方法,研究了磁场对铁在0.5 mol/L H3PO_(4)溶液中不同电位下阳极电流的影响。结果表明:0 T磁场下阳极极化曲线表现为典型的阳极溶解、溶解-钝化转变、稳态钝化和过钝化特征,0.4 T磁场下阳极极化曲线的活性溶解区范围扩大以至于没有出现钝化区;0 T磁场下极化后的铁电极表面相对均匀,而0.4 T磁场下极化后铁电极发生加速溶解,在其水平方向的两侧出现局部凹陷;在1.2~1.5 V高电位区间内铁电极表面产物膜向溶液的传质过程为阳极反应速率控制步骤时,施加磁场使得阳极电流密度显著增加,也加速了铁电极的局部溶解,施加或撤去磁场对析氧反应的影响不明显。The effects of magnetic field on the anodic current of iron in 0.5 mol/L H3PO_(4) solution at different potentials were studied by using polarization curve and potentiostatic polarization method. The results showed that the anodic polarization curve under 0 T magnetic field showed typical characteristics of anodic dissolution, dissolution-passivation transition, steady-state passivation and overpassivation. The range of active dissolution zone of anodic polarization curve expanded under 0.4 T magnetic field, so that there was no passivation zone. The surface of iron electrode was relatively uniform after polarization under 0 T magnetic field. While under the 0.4 T magnetic field, the iron electrode underwent accelerated dissolved after polarization, and local depressions appearred on both sides of its horizontal direction. When the mass transfer process of the product film on the iron electrode surface to the solution in 1.2-1.5 V high potential range was the anodic reaction rate control step, applying magnetic field increased anodic current density significantly, and also accelerated local dissolution of iron electrode. The effect of applying or withdrawing magnetic field on oxygen evolution reaction was not obvious.

关 键 词：铁 磁场 磷酸 腐蚀 阳极溶解 局部溶解 

分 类 号：TG174[金属学及工艺—金属表面处理]