Anti-corrosion Performance of LY12 Al Alloy Reinforced by Anodic Oxidization and Silanization
摘 要
采用阳极氧化法在LY12铝合金表面获得了多孔阳极氧化膜, 再采用溶胶-凝胶法在其表面制备了γ-环氧丙氧丙基三甲氧基硅烷(GPTMS)/正硅酸乙酯(TEOS)杂化膜。极化曲线与电化学阻抗谱(EIS)研究表明, 铝合金阳极氧化膜的维钝电流密度随浸泡时间延长而逐渐增大, 但至试验结束其维钝电流密度仍低于裸铝合金约2个数量级。铝合金阳极氧化膜经硅烷杂化溶胶封闭后, 其耐蚀性得到显著提高, 浸泡822 h后, 阳极维钝电流密度仍能保持在10-5 A/cm2, 低频阻抗值仍达到106 Ω数量级。扫描电镜(SEM)观察表明, 铝合金阳极氧化膜为多孔结构, 利于增强硅烷杂化膜与金属基体间的结合性能, 显著提高阳极氧化铝合金电极的耐蚀性能。
Abstract
Anodic oxidation coatings were made on LY12 aluminum alloys by anodic oxidation in sulfurix acid. Then, γ-glycidoxypropyltrimethoxysilane (γ-GPTMS)/tetraethylorthosilicate (TEOS) hybrid films were prepared on the coatings by sol-gel method. The results of polarization curve and electrochemical impedance spectroscopy (EIS) measurements indicated that the passive current density of the aluminum alloy electrode with anodic oxidized films increased with the increase of immersion time. However, the passive current density was about 2 orders of magnitude smaller than that of aluminum substrate. After sealed by silane hybrid sol, the anti-corrosion performance of anodic oxidized films increased obviously, the passive current densities of anodic polarization of the aluminum alloy electrode with anodic oxidized films still maintained at 10-5 A/cm2 and the low frequency impedance values of the electrode were about 106 Ω after immersed for 822 h. The scanning electron microscopy (SEM) showed that the anodic oxidation coatings presented porous morphology, which is favorable for increasing the adhesion of silane hybrid films to metal substrate and reinforcing the corrosion resistance of anodic oxidized aluminum alloy electrode obviously.
中图分类号 TG174
所属栏目 试验研究
基金项目 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)资助
收稿日期 2010/8/25
修改稿日期 2010/9/16
网络出版日期
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联系人作者张金涛(zhangjt@czu.cn)
备注张金涛, 副教授, 博士,
引用该论文: ZHANG Jin-tao,LI Chun-dong,ZHUANG Ya-feng,HU Ji-ming. Anti-corrosion Performance of LY12 Al Alloy Reinforced by Anodic Oxidization and Silanization[J]. Corrosion & Protection, 2011, 32(5): 340
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参考文献
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【7】Metroke T L, Apblett A. Effect of solvent dilution on corrosion protective properties of Ormosil coatings on 2024-T3 aluminum alloy[J]. Prog.Org.Coat., 2004, 51(1):36-46.
【8】张金涛, 潘亮, 李春东. LY12铝合金表面硅烷杂化膜的电化学性能研究[J]. 电镀与涂饰, 2008, 27(9):22-25.
【9】张金涛, 杨春勇, 潘亮, 等. 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[J]. 金属学报, 2008, 44(11):1372-1377.
【10】张金涛, 李春东, 潘亮, 等. 铈盐掺杂GPTMS/TEOS硅烷杂化膜腐蚀电化学行为随时间的变化[J]. 腐蚀与防护, 2009, 30(12):879-882.
【2】Correa-Borroel A L, Gutierrez S, Arce E, et al. Organosilanes and polypyrrole as anticorrosive treatment of aluminium 2024[J]. J.Appl.Electrochem, 2009, 39:2385-2395.
【3】朱祖芳. 铝合金阳极氧化与表面处理技术[M]. 北京:化学工业出版社, 2010, 第2版.
【4】周琦, 贺春林, 才庆魁, 等. 6种铝阳极氧化无铬封孔膜的性能比较[J]. 材料保护, 2009, 42(2):31-34.
【5】Chou T P, Chandrasekaran C, Limmer S J, et al. Organic-inorganic hybrid coatings for corrosion protection[J]. J.Non-Crystalline Solids, 2001, 290(2):153-162.
【6】Metroke T L, Gandhi J S, Apblett A. Corrosion resistance properties of Ormosil coatings on 2024-T3 aluminum alloy[J]. Prog.Org.Coat., 2004, 50(4):231-246.
【7】Metroke T L, Apblett A. Effect of solvent dilution on corrosion protective properties of Ormosil coatings on 2024-T3 aluminum alloy[J]. Prog.Org.Coat., 2004, 51(1):36-46.
【8】张金涛, 潘亮, 李春东. LY12铝合金表面硅烷杂化膜的电化学性能研究[J]. 电镀与涂饰, 2008, 27(9):22-25.
【9】张金涛, 杨春勇, 潘亮, 等. 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[J]. 金属学报, 2008, 44(11):1372-1377.
【10】张金涛, 李春东, 潘亮, 等. 铈盐掺杂GPTMS/TEOS硅烷杂化膜腐蚀电化学行为随时间的变化[J]. 腐蚀与防护, 2009, 30(12):879-882.
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