Na_(2)SiO_(3)浓度对7050铝合金微弧氧化膜层组织和性能的影响  

A Probe on the Effect on the Na_(2)SiO_(3)Concentration on the Microstructure and theProperties of Micro Arc Oxidation Coatings on 7050 Aluminum Alloy

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作  者:陈庚[1] 方琴[1] 叶靓 Chen Geng;Fang Qin;Ye Liang(Sichuan Engineering Technical College,Deyang,Sichuan,618000,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

出  处:《装备制造与教育》2022年第3期49-53,共5页Equipment Manufacturing and Education

基  金:四川工程职业技术学院重点规划项目(KJGH2020-14)。

摘  要:在Na_(2)SiO_(3)电解液体系下对航空用7050铝合金进行微弧氧化(MAO)处理。用X射线衍射仪(XRD)、扫描电镜(SEM)、膜层测厚仪、维氏硬度计、磨耗试验机和盐雾腐蚀箱研究了不同的Na_(2)SiO_(3)浓度对7050铝合金微弧氧化膜层物相组成、表面形貌、截面形貌、厚度、硬度、耐磨性和耐蚀性的影响。结果表明,经微弧氧化处理后形成的所有膜层均由α-Al2O3相、γ-Al2O3相和基体Al相组成。膜层表面呈现出典型的圆饼状“火山堆”形貌,并伴有大小不一的裂纹。随着Na_(2)SiO_(3)浓度的增加,膜层的厚度单调上升,但上升趋势不断减小;膜层的硬度呈现出先升后降的趋势,而磨耗比值变化趋势刚好相反。综合来看,当Na_(2)SiO_(3)浓度为10g/L时,膜层获得了最佳的综合性能,此时膜层的硬度、厚度和磨耗比分别为988HV0.1、25.6μm和0.285%。The 7050 aluminum alloy for aviation was treated by micro arc oxidation(MAO in short)in silicate system.The effects of different silicate concentrations on the phase composition,surface morphology,section morphology,thickness,hardness,roughness,wear resistance and corrosion resistance of 7050 aluminum alloy micro arc oxidation coatings were studied by means of XRD,SEM,metallographic microscope system,thickness tester,vickers hardness tester,roughness tester,wear tester and salt spray corrosion chamber.The result shows that all the coatings formed after micro arc oxidation are composed ofα-Al2O3 phaseγ-Al2O3 phase and matrix Al phase.The surface of the coatings present a typical round cake“Volcanic Heap”shape,accompanied by cracks of different sizes.With the increase of Na_(2)SiO_(3)concentration,the thickness of the coating increases monotonously,however,the upward trend decreases continuously,the hardness of the coating shows a trend of increasing first and then decreasing,while the change trend of wear ratio is just the opposite.In general,when the concentration of Na_(2)SiO_(3)is 10 g/L,the coating has the best comprehensive performance.At this time,the hardness,thickness and wear ratio of the coating are 988 HV0.1,25.6μm and 0.285%respectively.

关 键 词:微弧氧化 7050铝合金 硅酸盐 组织 性能 

分 类 号:TG174[金属学及工艺—金属表面处理]

 

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