Zn-Al-[V10O28]6-双层氢氧化物掺杂对LY12铝合金表面溶胶-凝胶涂层性能的影响

doi:10.3866/PKU.WHXB201408282

物理化学学报 >> 2014, Vol. 30 >> Issue (11): 2092-2100.doi: 10.3866/PKU.WHXB201408282

Zn-Al-[V₁₀O₂₈]^6-双层氢氧化物掺杂对LY12铝合金表面溶胶-凝胶涂层性能的影响

李松梅, 尹晓琳, 刘建华, 张优, 薛冰

北京航空航天大学材料科学与工程学院, 北京 100083

收稿日期:2014-06-19 修回日期:2014-08-28 发布日期:2014-10-30
通讯作者: 李松梅 E-mail:songmei_li@buaa.edu.cn
基金资助:
国家自然科学基金(51271012)资助项目

Effect of Doping with Zn-Al-[V₁₀O₂₈]^6- Layered Double Hydroxide on the Properties of Hybrid Sol-Gel Coatings on the LY12 Aluminum Surface

LI Song-Mei, YIN Xiao-Lin, LIU Jian-Hua, ZHANG You, XUE Bing

College of Material Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, P. R. China

Received:2014-06-19 Revised:2014-08-28 Published:2014-10-30
Contact: LI Song-Mei E-mail:songmei_li@buaa.edu.cn
Supported by:
The project was supported by the National Natural Science Foundation of China (51271012).

摘要/Abstract

摘要：

采用共沉淀法制备Zn-Al-[V₁₀O₂₈]^6-双层氢氧化物(以下简称LDH-V), 研究不同添加浓度(0.0、0.25×10^-3、0.75×10^-3、1.5×10^-3、3.0×10^-3 mol·L^-1)的LDH-V对LY12 铝合金溶胶-凝胶涂层形貌、耐蚀性的影响. 采用扫描电子显微镜(SEM)和傅里叶变换红外(FTIR)光谱研究LDH-V对涂层形貌和结构的影响. 运用中性盐雾实验对涂层进行耐蚀性评估. 利用电化学方法对涂层在0.05 mol·L^-1的NaCl 溶液中的腐蚀行为进行研究. 探讨加入LDH-V后溶胶-凝胶涂层的耐蚀机理. 结果表明, 一定量LDH-V的加入不仅可以提高溶胶-凝胶涂层的耐蚀性能, 还可对涂层被破坏区域进行自修复, 起到延缓铝合金基体腐蚀的作用. 然而, 当LDH-V的添加溶度超过一定值时, 会破坏涂层的完整性并降低涂层的腐蚀防护性能. 实验结果表明LDH-V最佳的添加浓度为1.5×10^-3mol·L^-1.

关键词: 溶胶-凝胶涂层, Zn-Al 双层氢氧化物, [V₁₀O₂₈]^6-, 腐蚀防护, 电化学交流阻抗谱

Abstract:

Zn-Al-[V₁₀O₂₈]^6- layered double hydroxide (LDH-V) as a type of corrosion inhibitor was prepared with the co-precipitation method using one solution containing zinc and aluminum nitrates precursors and a second solution containing Na₃VO₄, where the decavanadate anion is speciated at pH 4.5. The hybrid solgel solution was prepared from 3-glycydoxypropyltrimethoxysilane (GPTMS) as the organic precursor sol and zirconium n-propoxide (TPOZ) as the inorganic precursor sol. The doped coatings were obtained by dip coating the way that the samples were immersed into solutions with different LDH-V concentrations (0.0, 0.25×10^-3, 0.75×10^-3, 1.5×10^-3, 3.0×10^-3 mol·L^-1). The morphology and corrosion resistance of the solgel coating doped with different LDH-V concentrations were studied. The sol-gel coatings were investigated by scanning electron microscopy (SEM) and Fourier transform infrared (FTIR) spectroscopy. The salt spray test was used to evaluate the corrosion resistance of the different coatings. The corrosion behavior of the coatings was evaluated by electrochemical impedance spectroscopy (EIS) during immersion in 0.05 mol·L^-1 NaCl solution. The results showed that LDH-V not only improves the corrosion resistance of the coating, but also provides a function for self-healing of broken coatings. However, when the LDH-V doping concentration was high, it destroyed the integrity of the coatings and decreased the corrosion resistance of the coatings. The best LDH-V doping concentration was 1.5×10^-3 mol·L^-1.

Key words: Sol-gel coating, Zn-Al layered double hydroxide, [V₁₀O₂₈]^6-, Corrosion protection, Electrochemical impedance spectroscopy

李松梅, 尹晓琳, 刘建华, 张优, 薛冰. Zn-Al-[V₁₀O₂₈]^6-双层氢氧化物掺杂对LY12铝合金表面溶胶-凝胶涂层性能的影响[J]. 物理化学学报, 2014, 30(11): 2092-2100.

LI Song-Mei, YIN Xiao-Lin, LIU Jian-Hua, ZHANG You, XUE Bing. Effect of Doping with Zn-Al-[V₁₀O₂₈]^6- Layered Double Hydroxide on the Properties of Hybrid Sol-Gel Coatings on the LY12 Aluminum Surface[J]. Acta Phys. -Chim. Sin., 2014, 30(11): 2092-2100.

链接本文: https://www.whxb.pku.edu.cn/CN/10.3866/PKU.WHXB201408282

https://www.whxb.pku.edu.cn/CN/Y2014/V30/I11/2092

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Zn-Al-[V₁₀O₂₈]^6-双层氢氧化物掺杂对LY12铝合金表面溶胶-凝胶涂层性能的影响

Effect of Doping with Zn-Al-[V₁₀O₂₈]^6- Layered Double Hydroxide on the Properties of Hybrid Sol-Gel Coatings on the LY12 Aluminum Surface

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