激光重熔处理对铝合金微弧氧化膜组织与性能的影响  

Effect of Laser Remelting Treatment on Microstructure and Properties of Aluminum Alloy Micro-arc Oxidation Coatings

作　　者：唐仕光 陈泉志 蒋智秋[1,2] 童庆 董婉冰 李伟洲 TANG Shi-guang;CHEN Quan-zhi;JIANG Zhi-qiu;TONG Qing;DONG Wan-bing;LI Wei-zhou(School of Resources,Environment and Materials,Guangxi University,Nanning 530004,China;Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials,Guangxi University,Nanning 530004,China)

机构地区：[1]广西大学资源环境与材料学院,南宁530004 [2]广西大学广西有色金属及特色材料加工重点实验室,南宁530004

出　　处：《材料工程》2018年第12期157-164,共8页Journal of Materials Engineering

基　　金：国家自然科学基金项目(51371059);广西自然科学基金项目(2016GXNSFDA380022);广西高等学校高水平创新团队项目(第二批);南宁市科学研究与技术开发计划项目(20161312);广西科技重大专项(AA17204100)

摘　　要：利用不同功率的激光对膜层进行重熔处理,采用扫描电子显微镜、X射线衍射仪、显微硬度计、电化学工作站以及摩擦磨损实验对比分析激光处理前后膜层的微观结构、相组成、显微硬度、耐蚀性以及耐磨性能。结果表明:激光重熔处理使膜层进行了重熔,膜层部分微孔被熔融物填充,膜层重新熔融冷却后仍与基体结合良好,且更加致密。激光处理后的氧化膜仍然主要由γ-Al2O3相组成,并产生了少量α-Al2O3相。随着激光功率的增加,硬度先增加后降低,激光功率为150W时,显微硬度最大,为625HV。电化学测试表明,经150W激光处理后的膜层自腐蚀电位正移为-0.577V,自腐蚀电流密度降低为3.903×10-6 A/cm2。摩擦磨损实验表明,磨损过程出现三体磨损,膜层表面出现剥落现象,磨损量约为基体的1/323。The coating was treated by laser with different power. Microstructures of two kinds of coatings were examined by scanning electron microscopy（SEM）. The phase of two kinds of coatings was detected by X-ray diffraction（XRD）. The micro hardness of the coatings was tested by micro hardness tester. Corrosion resistance of the coatings was evaluated by electrochemical workstation. Wear resistance of the coatings was detected by friction and wear test. The results show that micro-arc oxidation coating is remelted by laser treatment, the coating is more dense after being remelted and cooling.The coating after laser treatment is still composed of γ-Al 2O 3 phase. Part of γ-Al 2O 3 in the coating is transformed to α-Al 2O 3. With the increase of laser power, micro hardness of the coating firstly increases and then decreases. When the laser power is 150W, the micro hardness is the maximum, which is 625HV. The electrochemical measurements show that corrosion potential of the coating is shifted to -0.577V and corrosion current density reduces significantly to 3.903×10 -6 A/cm 2 after 150W laser treatment. The friction and wear experiments show that the surface of the coating appears spalling phenomenon. Friction and wear loss is about 1/323 of the substrate.

关 键 词：铝合金 微弧氧化 激光重熔 致密性 耐蚀性 耐磨性 

分 类 号：TG174.451[金属学及工艺—金属表面处理]