微量稀土Sm对AZ80镁合金腐蚀性能的影响  

Effect of rare earth element Sm on corrosion resistance of AZ80 magnesium alloy

作　　者：王浩[1] 文九巴[1] 贺俊光[1] 马景灵[1] 杨永顺[1] 邵海洋[1] 

机构地区：[1]河南科技大学材料科学与工程学院,河南洛阳471003

出　　处：《材料热处理学报》2013年第4期41-45,共5页Transactions of Materials and Heat Treatment

基　　金：西北工业大学凝固技术国家重点实验室开放课题资助项目(SKLSP201008);河南省自然科学基金项目(092300410132);河南省科技攻关项目(072102230007)

摘　　要：通过静态失重法、电化学法、扫描电镜和XRD等手段研究微量Sm对AZ80镁合金的腐蚀性能和微观组织的影响。结果表明:Sm的加入使试验合金的自腐蚀电位升高,自腐蚀电流密度减小,合金的耐蚀性得到提高。当Sm含量为0.6%时合金的腐蚀速率下降为3.3 g.m-2.d-1仅为原始合金的25%。同时Sm在合金中形成Al3Sm相,改变了AZ80镁合金中β相(Mg17Al12)的数量和分布,使镁合金的腐蚀行为由较严重的局部腐蚀向均匀腐蚀转变。Effects of trace element Sm addition on corrosion resistance and mierostructure of AZ80 magnesium alloy were tested by mass loss method, electrochemical method, scanning electron microscopy and XRD. The results show that self-corrosion potential is positive shift, the self-corrosion current density is reduced and corrosion resistance of AZ80 magnesium alloy is significantly improved by the addition of Sm arises, the Sm content in the alloy is 0. 6% , the corrosion rate is 3.3g·m^-2·d^-1, only 25% of that of AZ80 alloy. Meanwhile a new phase Al3 Sm arises, the amount and the distribution of β （ Mg17 Al12 ） phase are changed by addition of Sm. The corrosion behavior of AZ80 magnesium alloy is changed from more serious local corrosion to uniform corrosion by the addition of element Sm.

关 键 词：SM AZ80镁合金 腐蚀 电化学性能 

分 类 号：TG174.2[金属学及工艺—金属表面处理]