铈盐和硅烷改性阳极氧化LY12铝合金的耐蚀性能  

Corrosion resistance of anodically oxidized LY12 aluminum alloy after modification with cerium nitrate and silane

作　　者：张金涛[1] 李春东[1] 曹桂萍[1] 胡吉明[2] 

机构地区：[1]常州工学院化工系,江苏常州213022 [2]浙江大学化学系,浙江杭州310027

出　　处：《电镀与涂饰》2010年第12期33-37,共5页Electroplating & Finishing

基　　金：国家自然科学基金项目(50871101);江苏省"青蓝工程"和常州工学院科研项目(YN0807)

摘　　要：采用硫酸阳极氧化法在LY12铝合金表面制备了阳极氧化膜,然后以γ–环氧丙氧丙基三甲氧基硅烷(GPTMS)/正硅酸乙酯(TEOS)杂化溶胶封闭,并在封闭过程中引入Ce3+作为缓蚀剂。对吸附Ce3+的铝合金阳极氧化膜进行了X射线光电子能谱(XPS)分析。通过极化曲线与电化学阻抗谱(EIS)研究了铈盐和硅烷杂化溶胶改性的阳极氧化铝合金电极在25°C、3.5%(质量分数)NaCl溶液中的耐蚀长效性。结果表明,硅烷杂化溶胶封闭方法极大提高了阳极氧化膜的耐长期腐蚀性能。Ce3+在硅烷杂化溶胶封闭的阳极氧化膜体系中的引入方式不同导致其耐蚀长效性具有显著差异。吸附Ce3+后再经硅烷杂化溶胶封闭的阳极氧化膜电极的耐蚀性显著高于铈盐掺杂硅烷杂化溶胶封闭的阳极氧化膜。An anodic oxidation film was prepared on the surface of LY12 aluminum alloy in a sulfuric acid solution,and then sealed with γ-glycidoxypropyltrimethoxysilane（γ-GPTMS） and tetraethyl orthosilicate（TEOS） hybrid sol with cerium（III） ions as corrosion inhibitor.The anodic oxidation film adsorbed Ce3＋ was analyzed by X-ray photoelectron spectroscopy（XPS）.The long-term corrosion resistance of anodically oxidized aluminum alloy electrode after modification with cerium nitrate and silane hybrid sol was studied by polarization curves and electrochemical impedance spectroscopy（EIS） in 3.5wt% NaCl solution at 25 °C.Results revealed that the long-term corrosion resistance of the anodic oxidation film sealed with silane hybrid sol was increased greatly.The different ways of adding Ce（III） to the anodic oxidation film sealed by silane hybrid sol lead to a evident difference in long-term corrosion resistance.The corrosion resistance of the anodic oxidation film after adsorption with Ce（III） followed by sealing with silane hybrid sol is significantly higher than that of the film sealed by Ce-doped silane hybrid sol.

关 键 词：铝合金 阳极氧化 铈盐 硅烷 改性 耐蚀性 

分 类 号：TG178[金属学及工艺—金属表面处理]