冷拉拔变形过程中含稀土铝镁合金腐蚀行为研究  

Corrosion Behavior of Al-Mg-RE Alloy Wires Subjected to Different Cold Drawing Deformation

作　　者：张欣[1,2] 杨光恒 王泽华[1] 曹静[1] 邵佳[1] 周泽华[1] ZHANG Xin;YANG Guangheng;WANG Zehua;CAO Jing;SHAO Jia;ZHOU Zehua(College of Mechanics and Materials,Hohai University,Nanjing 211100,China;Ocean and Offshore Engineering Research Institute,Hohai University,Nantong 226300,China)

机构地区：[1]河海大学力学与材料学院,南京211100 [2]河海大学海洋与近海工程研究院,南通226300

出　　处：《中国腐蚀与防护学报》2020年第5期432-438,共7页Journal of Chinese Society For Corrosion and Protection

基　　金：南通市科技计划项目(JC2018047);中央高校基本科研业务费项目(2018B02514).

摘　　要：采用光学显微镜(OM)、扫描电子显微镜(SEM)、能谱分析仪(EDS)、电化学工作站研究了在不同冷拉拔变形量下,Al-3.0%Mg-0.12%RE(质量分数)合金微观组织和腐蚀行为的变化规律,探索了冷拉拔变形量和微观组织对合金耐蚀性的影响。结果表明:随着冷拉拔变形量增加,Al-3.0%Mg-0.12%RE合金中等轴状晶粒向纤维状晶粒转变,晶粒均沿拉拔方向拉长,垂直拉拔方向拉扁,晶界处第二相被拉长并随着晶界的变形逐渐向线状分布。合金点蚀均主要发生在合金中的第二相处,随着冷拉拔变形量的增加,Al-3.0%Mg-0.12%RE合金均匀腐蚀敏感性增强,但点蚀敏感性减弱,阻抗半径增大,耐蚀性变好。Al-Mg alloys are considered as the ideal electromagnetic shielding materials and widely applied on electronic and communication servicing in marine environment due to their excellent comprehensive properties,such as high specific strength,low electric resistivity and excellent corrosion resistance.The microstructure and corrosion behavior of Al-3.0%Mg-0.12%RE alloy wires subjected to different cold drawing deformation was investigated by means of optical microscope(OM),scanning electron microscope(SEM),energy disperse spectroscopy(EDS)and electrochemical measurement.The influence of cold-drawing strain and microstructure on corrosion resistance of the alloy was also examined.The results indicated that the equiaxed grains of the alloys were elongated and the skeletal second phase particles were fragmented during the cold-drawing process.The corrosion behavior of the Al-3.0%Mg-0.12%RE alloy showed typical characteristics of pitting corrosion at the position of second phases.With the increase of strain,the uniform corrosion sensibility increased,pitting corrosion sensibility declined and the corrosion resistance of the alloy improved.

关 键 词：Al-3.0%Mg-0.12%RE合金 冷拉拔变形 腐蚀行为 点蚀 

分 类 号：TG174[金属学及工艺—金属表面处理]