摘要
利用金相显微镜、X-射线衍射、扫描电镜、集气法和电化学测试研究了铸态AZ91+xSn(x=0,0.2,0.5,1wt%)镁合金的显微组织和腐蚀行为。结果表明,实验合金在3.5%NaCl溶液中浸泡时,随着Sn含量的增加,其抗腐蚀性能先提高后降低。AZ91+0.2Sn合金具有最小的腐蚀速度,为AZ91合金的54%,主要是完全离异共晶β-Mg_(17)Al_(12)相替代了AZ91合金中的部分离异共晶β-Mg_(17)Al_(12)相;但AZ91+1.0Sn合金具有最大的腐蚀速度,为AZ91合金的118%,这是因为此合金具有局部腐蚀。
The microstructure and corrosion behavior of AZ91+sSn(x=0,0.2,0.5,1wt%)magnesium alloys were investigated by optical microscopy(OM),X-ray diffractometry(XRD),scanning electron microscopy(SEM),collecting gas method and electrochemical test.The results show as following:with Sn addition increasing,the corrosion resistance of tested alloys initially improves and then decreases in 3.5%NaCl solution.The AZ91+0.2Sn alloy has the lowest corrosion rate,which is 54%of AZ91 alloy,is contributed to the fully divorcedβ-Mg_(17)Al_(12)phase in the alloy replacing the partially divorcedβ-Mg_(17)Al_(12)phase in AZ91 alloy.Nevertheless,AZ91+1.0Sn alloy has the highest corrosion rate,which is 118%of AZ91 alloy,is ascribed to the existence of located corrosion in the alloy.
作者
朱宇荣
陈霞
陈彬
ZHU Yurong;CHEN Xia;CHEN Bin(School of Materials and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,China;School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)
出处
《热加工工艺》
北大核心
2022年第20期53-57,共5页
Hot Working Technology
