Galvanic corrosion behavior of AZ91D alloy/45 steel couple under magnetic field  

作　　者：Xin Zhang Wan Mei Zehua Zhou Shaoqun Jiang Gang Wang Xiangru Shi Zehua Wang 

机构地区：[1]College of Mechanics and Materials,Hohai University,Nanjing,211100,China

出　　处：《Journal of Magnesium and Alloys》2024年第9期3794-3805,共12页镁合金学报（英文）

基　　金：funded by“National Science Foundation of China(51909071);Natural Science Foundation of Jiangsu Province(BK20190493);the Fundamental Research Funds for the Central Universities(B220202040);Open Fund of Jiangsu Technical Center for Wind Energy Engineering(ZK22-03-08).”。

摘　　要：Galvanic corrosion behavior of AZ91D alloy/45 steel couple in 3.5 wt.%NaCl solution under 0,0.2 and 0.4 T magnetic field were studied by microstructure observation,immersion test and electrochemical measurement.The mixed potential theory was used to estimate the galvanic current density and the mixed potential of the galvanic corrosion between AZ91D alloy and 45 steel.The results indicated that magnetic field could accelerate the corrosion of AZ91D alloy,and impede the corrosion process of 45 steel.The effect of magnetic field on corrosion sensibility and corrosion rate of these two alloys increased as the intensity rising.The galvanic corrosion rate of the couple was accelerated by magnetic field.With the magnetic field intensity rising,the galvanic corrosion sensibility and corrosion rate of the couple increased.The effects of magnetic field on the galvanic corrosion performance of the couple and the corrosion behavior of AZ91D alloy and 45 steel were due to the appearance of field gradient force and magnetohydrodynamic(MHD)force.The mixed potential theory has a certain accuracy to estimate the Ecouple and icouple values in this work.

关 键 词：Magnetic field Corrosion behavior Galvanic corrosion The mixed potential theory 

分 类 号：TG172[金属学及工艺—金属表面处理]