微量Cu元素对Al-Zn-Mg合金力学性能及 剥落腐蚀性能的影响  

Effect of Trace Cu on Mechanical Properties and Exfoliation Corrosion Resistance of Al-Zn-Mg Alloy

作　　者：马文静 唐建国[1,2,3] 叶凌英 詹鑫[1] 黄连生 古一 MA Wen-jing;TANG Jian-guo;YE Ling-ying;ZHAN Xin;HUANG Lian-sheng;GU Yi(School of Materials Science and Engineering,Central South University,Changsha 410083,Hunan,China;Research Institute of Light Alloys,Central South University,Changsha 410083,Hunan,China;Key Laboratory of Non-ferrous Metal Materials Science and Engineering,Ministry of Education,Changsha 410083,Hunan,China;Institute of Plasma Physics,Chinese Academy of Sciences,Hefei 230031,Anhui,China;University of Science and Technology of China,Hefei 230026,Anhui,China)

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410083 [2]中南大学轻合金研究院,湖南长沙410083 [3]中南大学有色金属材料科学与工程教育部重点实验室,湖南长沙410083 [4]中国科学院等离子体物理研究所,安徽合肥230031 [5]中国科学技术大学,安徽合肥230026

出　　处：《矿冶工程》2021年第5期129-132,136,共5页Mining and Metallurgical Engineering

基　　金：国家自然科学基金(51474240);聚变堆主机关键系统综合研究设施(2018-000052-73-01-001228)。

摘　　要：采用室温拉伸、剥落腐蚀浸泡、电化学测试等方法研究了微量Cu元素对Al-Zn-Mg合金力学性能及剥落腐蚀性能的影响,并结合扫描电子显微镜、透射电子显微镜等手段分析了其机理。结果表明:Cu元素含量由0增加到0.18%,合金晶内η′强化相(MgZn_(2))体积分数由13.34%增至26.42%;合金抗拉强度由383.2 MPa增至407.0 MPa;晶界相分布更加连续,间距由37.5 nm降至11.3 nm;合金耐剥落腐蚀性能降低,最大腐蚀深度由30.08μm增至228.62μm。The effect of trace Cu(element)on mechanical properties and exfoliation corrosion resistance of Al-Zn-Mg alloy was investigated by performing tensile test,exfoliation corrosion and electrochemical tests.The microstructure was analyzed by using scanning electron microscopy and transmission electron microscopy to reveal corresponding mechanism.The results show that with the content of Cu element in the alloy increasing from 0 to 0.18%,the volume fraction ofη′(MgZn_(2))increases from 13.34%to 26.42%and the tensile strength increases from 383.2 MPa to 407.0 MPa.It is shown the grain boundary phases are distributed more continuously with the spacing decreased from 37.5 nm to 11.3 nm;the exfoliation corrosion resistance of the alloy is decreased,and the maximum corrosion depth is increased from 30.08μm to 228.62μm.

关 键 词：耐腐蚀性能 AL-ZN-MG合金 微量铜 力学性能 剥落腐蚀性能 强化相 

分 类 号：TG115[金属学及工艺—物理冶金]