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首页> 外文期刊>RSC Advances >Structural properties of cerium doped siloxane-PMMA hybrid coatings with high anticorrosive performance
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Structural properties of cerium doped siloxane-PMMA hybrid coatings with high anticorrosive performance

机译：铈掺杂硅氧烷-PMMA杂交涂层具有高抗腐蚀性的结构性能

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摘要

This study reports on the characterization of cerium doped organic-inorganic hybrid coatings by correlating their structural properties with the corrosion protection efficiency of coated carbon steel. The films were prepared via the sol-gel route from radical polymerization of methyl methacrylate (MMA) with 3-methacryloxy propyltrimethoxysilane (MPTS) followed by acidic hydrolysis and condensation of tetraethoxysilane (TEOS). After identifying the optimum proportion of polymeric and silica phase for the formation of a highly ramified structure (MMA/TEOS = 4), increasing concentration of Ce(IV) ions (0.1% < Ce/Si < 5%) was added to the inorganic precursor to enhance the passivating character of the films. Nuclear magnetic resonance, X-ray photoelectron spectroscopy, small angle X-ray scattering, atomic force microcopy and thermogravimetry were used to characterize the structural properties and electrochemical impedance spectroscopy, potentiodynamic polarization curves and field emission scanning electron microscopy were employed to evaluate the corrosion resistance of the coated samples in a standard saline environment. Structural analysis revealed a high degree of connectivity of the hybrid network, resulting in an enhanced thermal and electrochemical stability of the material. Detailed investigation of the structural effect of cerium species revealed that reduction of Ce(IV) ions during the polycondensation process catalyzes an increase of siloxane network connectivity (> 87%) and enhances the polymerization of organic moieties. The electrochemical assays showed that the coatings possess an excellent long-term stability at high corrosion resistance of up to 10 G Omega cm(2) and current densities about 6 orders of magnitude lower than that of the bare carbon steel. For elevated Ce(IV) doping levels the self-healing ability was observed preventing during long-term exposure further progression of the corrosion process.
机译：该研究通过将它们的结构性能与涂布碳钢的腐蚀保护效率相关性来报告铈掺杂有机 - 无机杂交涂层的表征。通过从甲基丙烯酸甲酯（MMA）的自由基聚合用3-甲基丙烯酰氧基丙基三甲氧基硅烷（MPT）的溶胶 - 凝胶途径制备薄膜，然后通过酸性水解和四乙氧基硅烷（TEOS）的缩合。在鉴定形成高度分枝结构（MMA / TEOS = 4）的聚合物和二氧化硅相的最佳比例后，将Ce（IV）离子的浓度增加（0.1％ 87％）的增加，并增强了有机部分的聚合。电化学测定表明，涂层具有优异的长期稳定性，在高达10gωcm（2）的高耐腐蚀性下具有优异的长期稳定性，并且电流密度大约比裸碳钢的6个数量级。对于升高的CE（iv）掺杂水平，观察到在长期暴露过程中预防自我愈合能力进一步进展腐蚀过程。

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  • 来源
    《RSC Advances》 |2015年第20期|共11页
  • 作者

    Harb S. V.; dos Santos F. C.; Caetano B. L.; Pulcinelli S. H.; Santilli C. V.; Hammer P.;

  • 作者单位

    UNESP Univ Estadual Paulista Inst Quim BR-14800900 Araraquara SP Brazil;

    UNESP Univ Estadual Paulista Inst Quim BR-14800900 Araraquara SP Brazil;

    UNESP Univ Estadual Paulista Inst Quim BR-14800900 Araraquara SP Brazil;

    UNESP Univ Estadual Paulista Inst Quim BR-14800900 Araraquara SP Brazil;

    UNESP Univ Estadual Paulista Inst Quim BR-14800900 Araraquara SP Brazil;

    UNESP Univ Estadual Paulista Inst Quim BR-14800900 Araraquara SP Brazil;

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  • 正文语种 eng
  • 中图分类 化学;
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