Al-5.0Mg-2.2Si-0.6Mn-xLa合金组织及腐蚀性能研究  

Microstructure and Corrosion Properties of Al-5.0Mg-2.2Si-0.6Mn-xLa Alloy

作　　者：罗忠祥 李薇 王亚东 周金明 隋育栋[4] LUO Zhongxiang;LI Wei;Wang Yadong;ZHOU Jinming;SUI Yudong(Yunnan Demeng Expressway Investment and Development Co.,Ltd.,Lincang 677000,Yunnan,China;Yunnan Transportation Planning and Design Research Institute Co.,Ltd.,Kunming 650093,China;National Engineering Research Center for Efficient Maintenance,Safety and Durability of Roads and Bridges,Broadvision Engineering Consultants Co.,Ltd.,Kunming 650200,China;Faculty of Materials Science and Engineering,Kunming University of Science and Technology,Kunming 650093,China)

机构地区：[1]云南德孟高速公路投资开发有限公司,云南临沧677000 [2]云南省交通规划设计研究院股份有限公司,云南昆明650093 [3]云南省交通规划设计研究院股份有限公司公路与桥梁高效养护及安全耐久国家工程研究中心,云南昆明650200 [4]昆明理工大学材料科学与工程学院,云南昆明650093

出　　处：《昆明理工大学学报（自然科学版）》2024年第4期50-58,共9页Journal of Kunming University of Science and Technology(Natural Science)

基　　金：云南省交通运输厅科技项目(云交科教便[2022]123号);云南交投科技创新计划项目(YCIC-YF-2022-20).

摘　　要：通过改变稀土La的质量百分含量(0,0.05%,0.10%,0.20%,0.40%,0.60%)研究了其对Al-5.0Mg-2.2Si-0.6Mn合金组织及腐蚀性能的影响规律.实验结果表明:La元素的加入能够显著影响合金的微观组织,随着La元素的增加,合金二次枝晶臂间距呈现先增加后降低的趋势;La元素能够改善合金的耐腐蚀性能,随合金中La元素含量的增加,合金耐腐蚀性能先增加后下降;当La元素质量百分含量为0.20%时,合金具有最优的耐腐蚀性能,不同腐蚀时间下不同La添加量的合金腐蚀速率呈现相同的变化规律,腐蚀速率由大到小依次为:0 La>0.60 La>0.05 La/0.40 La>0.10 La>0.20 La(质量分数%);当La元素添加过多时,合金中生成的粗大脆性稀土相严重降低合金的耐腐蚀性能.The effects of rare earth La mass percentage content(0%,0.05%,0.10%,0.20%,0.40%,0.60%)on the microstructure and corrosion properties of Al-5.0Mg-2.2Si-0.6Mn alloy were studied.The experimental results show that adding La element can significantly affect the alloy's microstructure.With the increase of La element,the secondary dendrite arm spacing of the alloy increases first and then decreases.La element can improve the corrosion resistance of the alloy.With the increase of La element content in the alloy,the corrosion resistance of the alloy increases first and then decreases.When the mass percentage content of La element is 0.20%,the alloy has the best corrosion resistance.The corrosion rate of the alloy with different amounts of La under different corrosion times presents the same change rule,and the corrosion rate is as follows from large to small:0 La>0.60 La>0.05 La/0.40 La>0.10 La>0.20 La(mass percentage,%).When La element is added too much,the coarse brittle rare earth phase formed in the alloy seriously reduces the corrosion resistance of the alloy.

关 键 词：Al-5.0Mg-2.2Si-0.6Mn合金 稀土La 二次枝晶臂间距 腐蚀 

分 类 号：TG146.21[一般工业技术—材料科学与工程]