脉冲频率对7050铝合金微弧氧化膜层特性的影响  

Effects of pulse frequency on properties of micro-arc oxidation coatings on 7050 aluminum alloy

作　　者：陈庚[1,2] 苗景国[1] 方琴[1] 彭显平[1] 章友谊[1] 王正云[2] CHEN Geng;MIAO Jing-guo;FANG Qin;PENG Xian-ping;ZHANG You-yi;WANG Zheng-yun(Department of Materials Engineering,Sichuan Engineering Technical College,Deyang 618000,China;School of Materials Science and Engineering,Xihua University,Chengdu 610039,China)

机构地区：[1]四川工程职业技术学院材料工程系,四川德阳618000 [2]西华大学材料科学与工程学院,四川成都610039

出　　处：《轻合金加工技术》2022年第1期52-58,共7页Light Alloy Fabrication Technology

基　　金：四川工程职业技术学院规划科研课题(KJGH2020-14);四川工程职业技术学院院级科研课题(YJ2020KJ-03)。

摘　　要：在硅酸钠电解液体系下对7050铝合金试样进行微弧氧化(MAO)处理。用XRD、SEM、膜层测厚仪、硬度计、粗糙度测试仪和盐雾腐蚀箱等手段实验研究了不同的脉冲频率对7050铝合金微弧氧化膜层物相组成、形貌、厚度、表面硬度和耐蚀性能的影响。结果表明:当脉冲频率在100Hz~700 Hz区间变化时,随着脉冲频率的增大,MAO膜层的厚度、硬度均呈现出先增大后减小的趋势,粗糙度呈现出不断增大的趋势。实验工艺参数制得的MAO膜层均呈现出典型的“火山口”形貌。当脉冲频率为300 Hz时,MAO膜层获得了最佳的综合性能,此时硬度、厚度、粗糙度分别为1178 HV_(0.1)、22.6μm和1.747μm。The 7050 aluminum alloy was treated by micro arc oxidation(MAO)in sodium silicate electrolyte system.The effects of pulse frequency on the phase composition,morphology,thickness,surface hardness and corrosion resistance of micro arc oxidation coatings on 7050 aluminum alloy were studied by means of XRD,SEM,film thickness tester,hardness tester,roughness tester and salt spray corrosion chamber.The results show that when the pulse frequency varies in the range of 100 Hz to 700 Hz,with the increase of pulse frequency,the thickness and hardness of MAO coatings first increase and then decrease,and the roughness increases.The Mao coatings prepared with test parameters show typical crater morphology.When the pulse frequency is 300 Hz,the MAO coating has the best comprehensive performance,and the hardness,thickness and roughness are 1178 HV_(0.1),22.6μm and 1.747μm respectively.

关 键 词：微弧氧化 7050铝合金 脉冲频率 MAO膜层 

分 类 号：TG174.4[金属学及工艺—金属表面处理]