纳米BN颗粒对7075铝合金微弧氧化膜结构及耐磨性能的影响  

Effect of Nano-BN Particles on Microstructure and Wear Resistance of Micro-Arc Oxidation Coating on 7075 Aluminum Alloy

作　　者：杨帆 齐玉明 傅文恺 黄鑫 崔学军 YANG Fan;QI Yuming;FU Wenkai;HUANG Xin;CUI Xuejun(Material Corrosion and Protection Key Laboratory of Sichuan Province,School of Materials Science and Engineering,Sichuan University Science and Engineering,Zigong 643000,China)

机构地区：[1]四川轻化工大学材料科学与工程学院材料腐蚀与防护四川省重点实验室,四川自贡643000

出　　处：《材料保护》2023年第7期17-24,89,共9页Materials Protection

基　　金：国家自然科学基金面上项目(52275221);四川省自然科学基金(2022NSFSC0330);四川省自然科学基金(2023NSFSC0917)资助。

摘　　要：为提高7075铝合金表面的耐磨性能,在掺杂纳米BN颗粒的电解质溶液中通过微弧氧化技术构筑铝合金表面硬质陶瓷涂层。利用扫描电子显微镜(SEM)、能谱仪(EDS)、X射线衍射仪(XRD)、光电子能谱仪(XPS)、粗糙度仪、显微硬度计、摩擦磨损试验机等表征方法,研究了加入纳米BN颗粒对微弧氧化过程起弧电压及涂层的表面形貌、孔隙率、物相组成、厚度、粗糙度、显微硬度、摩擦磨损性能的影响。结果表明:涂层主要由α-Al_(2)O_(3)相和γ-Al_(2)O_(3)相组成;纳米BN颗粒提高了起弧电压,增加了涂层的厚度、粗糙度、硬度;当添加0.3 g/L纳米BN颗粒时,所得微弧氧化涂层的综合性能最佳。此时涂层中的微孔数量少、孔径小,致密度高,其表面孔隙率从未添加的6.617%降到3.518%;硬度达到最高值916.7 HV_(10 N),厚度20μm,粗糙度2.38μm;摩擦系数降低至0.7,磨损率降低至7.84×10^(-5)mm^(3)/(N·m)。In order to improve the wear resistance of 7075 aluminum alloy surface,the hard ceramic coating on the aluminum alloy surface was constructed by micro-arc oxidation technology in the electrolyte solution doped with nano-BN particles.The effects of the addition of nano-BN particles on the arc initiation voltage of the micro-arc oxidation process,surface morphology,porosity,phase composition,thickness,rough-ness,microhardness and friction and wear properties of coating were investigated by means of scanning electron microscopy(SEM),energy dispersive spectrometer(EDS),X-ray diffractometer(XRD),photoelectron spectrometer(XPS),roughness tester,microhardness tester,friction and wear testing machine.Results showed that the coatings were mainly composed ofα-Al_(2)O_(3)andγ-Al_(2)O_(3)phase.Nano-BN particles increased the arc initiation voltage,and increased the thickness,roughness and hardness of coating.When the concentration of nano-BN particles was 0.3 g/L,the overall performance of the as-obtained micro-arc oxidation coating was the best.At this time,the number of micropores in the coating was small,the pore size was small,and the surface density was high.Compared with the coating prepared in the basic electrolyte,the coating’s surface porosity decreased from 6.617%to 3.518%.Meanwhile,the hardness reached the highest value 916.7 HV_(10 N),the thickness was 20μm,and the roughness was 2.38μm.The friction coefficient was reduced to 0.7,and the wear rate decreased to 7.84×10^(-5)mm^(3)/(N􀅰m).

关 键 词：微弧氧化 7075铝合金 纳米BN颗粒 结构 耐磨性能 

分 类 号：TG174.451[金属学及工艺—金属表面处理]