铝合金微弧氧化表面LDH的制备与性能研究  

The Preparation and Study of the Layered Double Hydroxide Growth on Micro-arc Oxidation Coatings on 2024 Aluminum Alloy

作　　者：杨含 张丽娜 窦宝捷 苏正良[3] 林修洲 Yang Han;Zhang Lina;Dou Baojie;Su Zhengliang;Lin Xiuzhou(College of Materials Science and Engineering,Sichuan University of Science&Engineering,Zigong 643000,Sichuan,China;Key Laboratory for Corrosion and Protection of Materials of Sichuan Province,Zigong 643000,Sichuan,China;The Second Research Institute of CAAC,Chengdu 610041,Sichuan,China)

机构地区：[1]四川轻化工大学材料科学与工程学院,四川自贡643000 [2]材料腐蚀与防护四川省重点实验室,四川自贡643000 [3]中国民用航空局第二研究所,四川成都610041

出　　处：《四川化工》2022年第1期35-38,共4页Sichuan Chemical Industry

基　　金：国家自然科学基金(E51901146);四川省科技计划资助(2020JDRC0098,2021YFG0246)。

摘　　要：利用水热合成法在2024铝合金微弧氧化涂层表面原位生长了水滑石(LDH),制备得到硝酸根型微弧氧化水滑石复合膜层(MAO-LDH-NO),再将缓蚀剂VO_(3)^(-)插层到LDH中,得到矾酸根插层的微弧氧化型水滑石复合膜层(MAO-LDH-VO)。采用扫描电镜、能谱仪、X射线衍射仪对膜层进行组织结构表征,采用极化曲线及电化学阻抗谱对膜层的耐蚀性能进行研究,结果表明:微弧氧化涂层原位生长LDH能修复微弧氧化膜层缺陷,提高膜层耐蚀性能,而缓蚀剂VO_(3)^(-)插层到LDH能够进一步提升膜层耐蚀性能。In this paper,hydrotalcite(LDH)was grown in situ on the surface of the 2024 aluminum alloy micro-arc oxidation coating by hydrothermal synthesis,and the nitrate-type micro-arc oxidation hydrotalcite composite coating(MAO-LDH-NO)was prepared,and then it was slowed down.Etching agent VO_(3)^(-) is intercalated into LDH to obtain a micro-arc oxidation type hydrotalcite composite coating(MAO-LDH-VO)intercalated with aluminate radicals.Scanning electron microscope,energy spectrometer,and X-ray diffractometer are used to characterize the structure of the coatings.Polarization curve and electrochemical impedance spectroscopy are used to study the corrosion resistance of the coatings.The results show that the micro-arc The in-situ growth of LDH on the oxide coating can repair the defects of the micro-arc oxide coating and improve the corrosion resistance of the coating,and the intercalation of the corrosion inhibitor VO_(3)^(-) into the LDH can further improve the corrosion resistance of the coating.

关 键 词：铝合金 微弧氧化 LDH 耐蚀性 

分 类 号：TG174.4[金属学及工艺—金属表面处理]