...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Improvement of the corrosion resistance of polysiloxane hybrid coatings by cerium doping
【24h】

Improvement of the corrosion resistance of polysiloxane hybrid coatings by cerium doping

机译：铈掺杂改善聚硅氧烷杂化涂料的耐蚀性

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Polysiloxane hybrid films were deposited on stainless steel by dip-coating using a sol prepared by hydrolytic co-polycondensation of tetraethoxysilane (TEOS) and 3-methacryloxy propyltrimethoxysilane (MPTS), followed by radical polymerization of methacrylic moieties. The TEOS/MPTS ratio was chosen equal to 2 and the Ce/Si ratio varied between 0.01 and 0.1. The effects of cerium concentration and valence (Ce(III) and Ce(IV)) on the structural features of polysiloxane films were studied by X-ray photoelectron spectroscopy (XPS) and ~(29)Si nuclear magnetic resonance (NMR). The corrosion protection of stainless steel by the hybrid coatings was investigated by XPS, electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization curves, after immersion in saline and acid solutions. The NMR results have shown for Ce(IV) doped films a high degree of polycondensation of up to 89%. Electrochemical analysis has evidenced that hybrid films with the lowest Ce concentration act as an efficient diffusion barrier by increasing the corrosion resistance and reducing the current densities up to 3 orders of magnitude compared to bare stainless steel. The analysis of structural effects induced by Ce(III) and Ce(IV) species, performed by XPS, indicates that the improved corrosion protection of Ce(IV) doped films might be mainly related to the enhanced polymerization of siloxane groups.
机译：通过使用四乙氧基硅烷（TEOS）和3-甲基丙烯酰氧基丙基三甲氧基硅烷（MPTS）的水解共缩聚制备的溶胶，通过浸涂将聚硅氧烷杂化膜沉积在不锈钢上，然后进行甲基丙烯酸部分的自由基聚合。选择TEOS / MPTS比率等于2，并且Ce / Si比率在0.01到0.1之间变化。通过X射线光电子能谱（XPS）和〜（29）Si核磁共振（NMR）研究了铈浓度和化合价（Ce（III）和Ce（IV））对聚硅氧烷薄膜结构特征的影响。浸入盐和酸溶液后，通过XPS，电化学阻抗谱（EIS）和电势极化曲线研究了混合涂层对不锈钢的腐蚀防护。 NMR结果表明，掺杂Ce（IV）的薄膜具有高达89％的高度缩聚度。电化学分析表明，与裸露的不锈钢相比，具有最低Ce含量的杂化膜可通过提高耐蚀性并将电流密度降低多达3个数量级来充当有效的扩散阻挡层。 XPS对Ce（III）和Ce（IV）物种引起的结构效应的分析表明，掺杂Ce（IV）的薄膜改善的腐蚀防护可能主要与硅氧烷基团的聚合有关。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号