微量稀土La改性6063铝合金及其氧化着色膜的研究  

Study on Modification of Rare-earth La to 6063 Aluminum Alloys and Its Anodized Coloured Membrane

作　　者：杨天恩[1] 熊计[1] 姚春明 徐红阳 

机构地区：[1]四川大学制造科学与工程学院,四川成都610065 [2]成都阳光铝制品有限公司,四川成都610100

出　　处：《热加工工艺》2018年第2期199-203,207,共6页Hot Working Technology

基　　金：四川省科技计划项目(2015GZ0057)

摘　　要：制备了含稀土La的6063铝合金,进行了阳极氧化和电解着色,并研究了氧化着色膜的耐腐蚀性能。结果表明：6063铝合金中添加微量稀土La能有效细化合金的晶粒,这与结晶时形核率增加以及晶粒长大速率的降低有关。当加入微量稀土La时,由于细晶强化作用和Mg2Si弥散强化作用使得挤压时效后的合金抗拉强度、塑性及硬度增加。在6063铝合金中,添加0.2wt%La是较为优化的参考含量,该含量条件下,6063铝合金氧化着色膜的膜基结合力及硬度最高。微量稀土La加入到6063铝合金中提高了基体阴极极化能力,氧化膜厚度和致密性增加,提高了氧化着色膜在Cl-溶液中的耐蚀性。6063 aluminum alloys with rare-earth La were prepared, which were anodized and electrolytically coloured,and the corrosion resistance of anodized coloured membranes was investigated. The results show the crystal grains of 6063 aluminum alloys can be refined with a small amount of La addition, which is correlated with the increase of nucleation rate and the decline of grain growth during crystallization. When adding small amout of RE La, the tensile strength, plasticity and hardness of the extruded and aged alloys increase due to the grain refinement strengthening and dispersion strengthening of Mg2 Si. Adding 0.2 wt%La is an optimal reference for 6063 aluminum alloys, and with this content, the film-substrate adhesion and hardness of the anodized coloured membrane are the highest. The cathodic polarization ability of 6063 aluminum alloys improves when small amount of La is added, and then, the oxide film thickness and density increase, which can improve the corrosion resistance of oxidation coloring film in the solution containing Cl-.

关 键 词：铝合金 稀土La 阳极氧化 耐蚀性 

分 类 号：TG177[金属学及工艺—金属表面处理]