Zn含量对Al-Mg-Si系合金组织与晶间腐蚀性能的影响  

Effects of Zn Content on Microstructure and Intergranular Corrosion of Al-Mg-Si Alloy

作　　者：孙琳 邓运来[2] 池水清 SUN Lin;DENG Yunlai;CHI Shuiqing(National Engineering Research Center for High Speed EMU,CRRC Qingdao Sifang Co.,Ltd.,Qingdao 266111,China;School of Materials Science and Engineering,Central South University,Changsha 410083,China)

机构地区：[1]中车青岛四方机车车辆股份有限公司国家高速动车组总成工程技术研究中心,山东青岛266111 [2]中南大学材料科学与工程学院,湖南长沙410083

出　　处：《热加工工艺》2022年第2期110-113,共4页Hot Working Technology

基　　金：国家重点基础研究发展计划项目(2016YFB0300901);广西省重点研发计划项目(1412001-5)。

摘　　要：采用扫描电子显微镜(SEM)、透射电子显微镜(TEM)、维氏硬度计和电化学试验等分析技术研究了0.2wt%Zn的添加对于Al-Mg-Si系合金组织、时效硬化、晶间腐蚀(IGC)性能的影响。结果表明,0.2wt%Zn含量的合金峰值硬度为125.8 HV,相较于0.05wt%Zn含量合金的硬度增加了12.7 HV。0.2wt%Zn的加入,使得合金的PFZ变宽,晶界析出相尺寸也略有增加,这导致了Al-Mg-Si系合金的抗晶间腐蚀能力的降低,0.2wt%Zn含量的合金在峰时效状态下的腐蚀电流密度高于0.05wt%Zn含量合金的腐蚀电流密度。The effects of 0.2wt%Zn addition on microstructure,age hardening and IGC properties of Al-Mg-Si alloy were investigated by scanning electron microscope(SEM),transmission electron microscope(TEM)hardness testing and electrochemistry testing.The results show that the peak hardness of the alloy with 0.2wt%Zn content is 125.8 HV.Compared with 0.05wt%Zn content alloy,the hardness increases by 12.7 HV.With the addition of 0.2wt%Zn,the PFZ of the alloy becomes wider and the grain boundary precipitation phase size increases slightly,which result in the decrease of the intergranular corrosion resistance of Al-Mg-Si alloys.The corrosion current density of the alloy with 0.2wt%Zn content in the peak aging state is higher than that of the alloy with 0.05wt%Zn content.

关 键 词：AL-MG-SI合金 Zn含量 显微组织 晶间腐蚀 力学性能 

分 类 号：TG174.33[金属学及工艺—金属表面处理]