深冷处理时间对AZ31镁合金耐蚀性的影响  

Influence of deep cryogenic treatment time on corrosion resistance of AZ31 magnesium alloy

作　　者：吴志生[1] 弓晓园[1] 赵菲[1] 李岩[1] 李璐[1] 杨栋[1] 

机构地区：[1]太原科技大学材料科学与工程学院,山西太原030024

出　　处：《焊接技术》2013年第1期7-9,1,共3页Welding Technology

基　　金：教育部博士点基金(20101415110002);山西省留学基金(2012-075);山西省研究生创新基金(20103093);山西省大学生创新实验基金(201016X);太原市研究生创新基金(20121016)

摘　　要：在-196℃下,采用不同的深冷时间处理AZ31镁合金,然后在w(NaCl)3.5%腐蚀液中进行全浸腐蚀试验,通过失重法以及微观金相观察等试验来探讨深冷处理时间对镁合金的抗腐蚀能力的影响,试验结果表明,经过6 h深冷处理的AZ31镁合金的抗腐蚀能力是未经深冷处理合金的3倍,其主要原因是深冷处理过程细化了合金晶粒以及使第二相β-Mg17Al12弥散析出。其中,β相对镁合金的耐腐蚀性能起着双重作用,当其含量较少时阻碍镁合金腐蚀,含量较多时则会和α相构成微电偶而加速镁合金腐蚀。因此,合理控制深冷处理时间,可提高镁合金的耐腐蚀性能。under-196 ℃,AZ31 magnesium alloy processed by different deep cryogenic time,and then prepare corrosion test in the medium concentration of 3.5% solution by weight loss method and micro-metallographic observation,and then explore the influence of deep cryogenic process time on the corrosion resistance of magnesium alloy.The results showed that the corrosion resistance of AZ31 magnesium alloy after 6 h cryogenic treatment was three times of the one without cryogenic treatment.The main reason was that was refined by deep cryogenic processing of magnesium alloy grain and ultra-low temperature make the second-phase precipitated.In particular,the β phase could play a dual role on the corrosion resistance of magnesium alloy.When its content was less,reducing the corrosion of magnesium alloy.More content would form micro-galvanic with α phase and accelerate the corrosion of magnesium alloy.Therefore,magnesium alloy could be improved by controlling cryogenic processing time reasonably.

关 键 词：深冷处理 AZ31镁合金 耐腐蚀性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]