摘要
通过光学显微镜(OM)、扫描电镜(SEM)、X射线衍射仪(XRD)、浸泡测试和电化学测试等研究了Mg-2Zn-1Y-0.5Zr合金在490℃固溶4~14 h后的微观组织和腐蚀性能。结果表明:随着固溶时间的延长,合金的晶粒尺寸逐渐由98.19μm增大到142.90μm,合金中的第二相逐渐溶解,第二相体积分数由1.33%降到0.02%,大幅降低了第二相与合金基体之间因腐蚀电位不同而引起的微电偶腐蚀;在490℃固溶处理8 h时后,合金的腐蚀速率为0.414 mm/y,自腐蚀电位为-1.525 V,自腐蚀电流密度为3.327μA/cm^(2),耐蚀性能最好。
Microstructure and corrosion resistance of Mg-2Zn-1Y-0.5Zr alloy after solution treatment at 490℃for 4-14 h were studied by means of optical microscope(OM),scanning electron microscopy(SEM),X-ray diffraction(XRD),immersion test and electrochemical test.The results show that with the increase of solution time,the grain size of the alloy increases from 98.19μm to 142.90μm,the second phase of the alloy gradually dissolves,and the volume fraction of the second phase decreases from 1.33%to 0.02%,which greatly reduces the micro galvanic corrosion between the second phase and the alloy matrix due to different corrosion potentials.After solution treatment at 490℃ for 8 h,the corrosion rate of the alloy is 0.414 mm/y,the self-corrosion potential is-1.525 V,the self-corrosion current density is 3.327μA/cm^(2),and the corrosion resistance is the best.
作者
田培梧
贺俊光
文九巴
师慧娜
TIAN Pei-wu;HE Jun-guang;WEN Jiu-ba;SHI Hui-na(School of Materials Science and Engineering,Henan University of Science and Technology,Luoyang 471023,China;Provincial and Ministerial Co-construction of Collaborative Innovation Center for Non-ferrous Metal New Materials and Advanced Processing Technology,Luoyang 471023,China)
出处
《材料热处理学报》
CAS
CSCD
北大核心
2021年第9期50-57,共8页
Transactions of Materials and Heat Treatment
基金
河南省高等学校重点科研项目(20A430010)。
