深冷处理时间对镁合金MIG焊接接头耐腐蚀性的影响  

Effect of Cryogenic Treatment Time on the Corrosion Resistance of Magnesium Alloy MIG Welded Joint

作　　者：杨栋[1] 吴志生[2] 弓晓园[2] 张立 YANG Dong;WU Zhi-sheng;GONG Xiao-yuan;ZHANG Li(Teaching Center of Experiment and Practice,Shanxi Datong University,Datong 037003,China;College of Materials Science and Engineering,Taiyuan University of Science and Technology,Taiyuan 030024,China)

机构地区：[1]山西大同大学教学实验与实训中心,山西大同037003 [2]太原科技大学材料科学与工程学院,山西太原030024

出　　处：《材料保护》2021年第10期93-96,共4页Materials Protection

基　　金：山西省高等学校科技创新项目(2020L0610);山西大同大学校级青年科学研究项目(2018Q11)资助。

摘　　要：针对镁合金焊接接头耐腐蚀性差的问题,采用液氮作为制冷剂,在-190℃对AZ31镁合金MIG焊接接头进行了不同时间的深冷处理,随后在3.5%的NaCl腐蚀液中进行全浸腐蚀试验,通过失重法、微观金相观察以及XRD分析等探讨了深冷处理时间对镁合金焊接接头耐腐蚀的影响。试验结果表明:合理控制深冷处理时间可以提高镁合金焊接接头的耐腐蚀性,其中经过(-190℃、6 h)深冷处理后的焊接接头耐腐蚀性较好。In view of the poor corrosion resistance of magnesium alloy welded joints,liquid nitrogen was used as a refrigerant to conduct cryogenic treatment of AZ31 magnesium alloy MIG welded joints at-190℃for different times,and then the full immersion corrosion test in 3.5%NaCl corrosion solution was carried out.Through weight-loss method,microscopic metallographic observation and XRD diffraction analysis,the effect of cryogenic treatment time on corrosion of magnesium alloy welded joints was discussed.Results showed that the corrosion resistance of magnesium alloy welded joint could be improved by controlling the time of cryogenic treatment reasonably.The corrosion resistance of welded joint after cryogenic treatment at-190℃for 6 hour was better.

关 键 词：镁合金 焊接接头 深冷处理 耐腐蚀性 

分 类 号：TG156.91[金属学及工艺—热处理]