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2A12铝合金表面铈盐掺杂硅烷杂化膜在3.5%NaCl溶液中耐蚀性能的电化学研究 被引量:25

ELECTROCHEMICAL STUDY OF CORROSION RESISTANCE OF CERIUM NITRATE DOPED SILANE-BASED HYBRID FILMS ON ALUMINUM ALLOY 2A12
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摘要 采用溶胶-凝胶法,以γ-环氧丙氧丙基三甲氧基硅烷(γ-GPTMS)和正硅酸乙酯(TEOS)为前驱体,在2A12铝合金表面制备了稀土铈盐(Ce(NO_3)_3)掺杂的有机-无机杂化膜,研究了铈盐掺杂浓度和涂层固化温度等工艺条件.通过极化曲线和电化学阻抗谱(EIS),比较了掺杂与未掺杂有机-无机硅烷杂化膜、铬酸盐转化膜和RE转化膜在3.5%NaCl(质量分数)溶液中的耐腐蚀性能.测试结果均表明,铈盐掺杂硅烷杂化膜的极化电阻比掺杂前增大了约13倍,并显著高于铬酸盐转化膜和RE转化膜. Silane-based organic-inorganic hybrid films doped with cerium nitrate were prepared on 2A12 aluminum alloys by sol-gel method usingγ-glycidoxypropyltrimethoxysilane(γ-GPTMS)and tetraethylorthosilicate(TEOS)precursors.The preparing conditions including doping concentration of cerium salt and curing temperature of coatings were investigated.The corrosion resistance of Ce-doped silane-based hybrid coatings was compared with non-doped silane-based hybrid films,chromate and RE conversion coatings for 2A12 aluminum alloys in 3.5%NaCl(mass fraction)solution by polarization curve and electrochemical impedance spectroscopy(EIS),respectively.The results indicated that the polarization resistance value of Ce-doped silane-based hybrid films increased by about 13 times compared with that measured for non-doped silane-based hybrid coating,and is much greater than those of chromate and RE conversion coatings.
出处 《金属学报》 SCIE EI CAS CSCD 北大核心 2008年第11期1372-1377,共6页 Acta Metallurgica Sinica
基金 江苏省教育厅高校自然科学研究指导性项目YW06005 常州工学院科研项目J070307资助~~
关键词 铈盐 有机硅烷 铝合金 极化曲线 电化学阻抗谱 cerium salt silane aluminum alloy polarization curve electrochemical impedance spectroscopy
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