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
罗忠祥 1李薇 2王亚东 1周金明 1隋育栋3
作者信息
- 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;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
- 3. 昆明理工大学材料科学与工程学院,云南昆明 650093
- 折叠
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.
Abstract
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 in-crease of La element,the secondary dendrite arm spacing of the alloy increases first and then decreases.La ele-ment 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 ele-ment 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Key words
Al-5.0Mg-2.2Si-0.6Mn alloy/rare earth La/secondary dendrite arm spacing/corrosion引用本文复制引用
基金项目
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)
出版年
2024
NETL
NSTL
万方数据