7075铝合金微弧氧化膜硅溶胶封孔工艺及其性能  

Silica sol sealing process and properties of micro-arc oxidation film on 7075 aluminum alloy

作　　者：李军 姜波[1,2] 王超 宋仁国 Li Jun;Jiang Bo;Wang Chao;Song Renguo(School of Mechanical Science and Engineering,Changzhou University,Changzhou Jiangsu 213164,China;Jiangsu Key Laboratory of Materials Surface Science and Technology,Changzhou University,Changzhou Jiangsu 213164,China)

机构地区：[1]常州大学材料科学与工程学院,江苏常州213164 [2]常州大学江苏省材料表面科学与技术重点实验室,江苏常州213164

出　　处：《金属热处理》2021年第5期224-229,共6页Heat Treatment of Metals

基　　金：国家自然科学基金(51871031)。

摘　　要：对微弧氧化后的7075铝合金进行硅溶胶封孔处理,采用扫描电镜、X衍射仪、高温摩擦磨损试验机和电化学工作站对硅溶胶封孔前后微弧氧化膜层的微观表面形貌、截面形貌、相组成、耐磨性和耐腐蚀性进行观察分析,研究了硅溶胶-凝胶不同封孔工艺对封孔效果的影响。结果表明,相对于微弧氧化膜层,封孔后的微弧氧化膜层微孔明显减少,膜层的粗糙度降低,耐磨性得到提高。封孔后的铝合金微弧氧化膜腐蚀电位由-0.62 V(vs SCE)正移到-0.36 V(vs SCE),腐蚀电流密度由2.44×10^(-3)A·cm^(-2)下降到2.03×10^(-4)A·cm^(-2),耐腐蚀能力得到显著提高。通过浸渍提拉法封孔的微弧氧化膜层的耐腐蚀性比旋涂法封孔的更好。Silica sol sealing process was carried out for the micro-arc oxidation film on 7075 aluminum alloy.The microscopic surface morphology,cross-sectional morphology,phase composition,wear resistance and corrosion resistance of the micro-arc oxide film before and after the silica sol sealing were analyzed by scanning electron microscope,X-ray diffractometer,high temperature friction and wear test machine and electrochemical workstation.And the influence of different silica sol-gel sealing processes on the sealing effect was investigated.The results show that compared with the unsealed micro-arc oxidation film,the micro-holes in the micro-arc oxidation film after sealing are obviously reduced,the roughness of the film is reduced,and the wear resistance is improved.The corrosion potential of the micro-arc oxidation film after sealing is positively shifted from -0.62 V(vs SCE)to-0.36 V(vs SCE),the corrosion current density drops from 2.44×10^(-3) A·cm^(-2) to 2.03×10^(-4) A·cm^(-2),and the corrosion resistance of the micro-arc oxidation film is significantly improved after sealing.However,the corrosion resistance of the micro-arc oxidation film sealed by the dipping and pulling method is better than that sealed by the spin coating method.

关 键 词：微弧氧化膜 封孔 硅溶胶 浸渍提拉法 旋涂法 

分 类 号：TG174[金属学及工艺—金属表面处理]