Ce(IV)离子用量对杂化膜在0.1 mol L-1 NaCl溶液中电化学行为的影响

F. S. Da Silva, H. D. De Melo, A. Benedetti, P. H. Suegama
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引用次数: 6

摘要

在0.1 mol L-1 NaCl溶液中,研究了在水解溶液中加入铈离子(Ce(SO4)2对四乙氧基硅烷(TEOS)和3-甲基丙烯氧基-丙基-三甲氧基硅烷(MPTS)制备的有机-无机杂化涂层对碳钢基体的防腐性能的影响。开路电位(EOC)和电化学阻抗谱(EIS)实验表明,Ce4+离子的用量对有机-无机杂化涂层的保护作用有极大的依赖性。这些结果与光学显微镜对降解表面的观察结果一致,两种方法都表明,当有机-无机混合溶液中加入500 ppm的Ce4+离子时,产生了更多的保护涂层。x射线光电子能谱(XPS)研究了有机-无机杂化涂层的化学状态,结果表明Ce4+离子的加入提高了有机-无机杂化涂层的缩聚度,形成了更致密的硅氧烷(Si-O-Si)网络。采用激光诱导击穿光谱(LIBS)和紫外可见光谱(UV-Vis)技术分别验证了涂层结构中Ce离子的存在及其氧化状态。LIBS结果证实涂层中存在Ce离子,根据UV-Vis测量,Ce离子主要处于(IV)-氧化态。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Influence of Ce(IV) ions amount on the electrochemical behavior of hybrid films in 0.1 mol L-1 NaCl solution
In this work, the influence of ceric ions (Ce(SO4)2) addition to the hydrolysis solution on the corrosion protection afforded by organic-inorganic hybrid coating obtained from tetraethoxysilane (TEOS) and 3-methacryloxy-propyl-trimethoxysilane (MPTS) to a carbon steel substrate in 0.1 mol L-1 NaCl solution was studied. Open circuit potential (EOC) and electrochemical impedance spectroscopy (EIS) experiments were carried out and showed that the protection afforded by the organic-inorganic hybrid coating was extremely dependent on the Ce4+ ions amount. These results were in close agreement with optical microscopy observation of the degrading surfaces, both procedures showing that more protective coating was produced when 500 ppm of Ce4+ ions were added to the organic-inorganic hybrid solution. The chemical state of the organic-inorganic hybrid coating investigated by X-ray photoelectron spectroscopy (XPS) indicated that the addition of Ce4+ ions enhances the polycondensation degree of the organic-inorganic hybrid coating leading to a denser siloxane (Si-O-Si) network. A strategy using laser-induced breakdown spectroscopy (LIBS) and UV-Vis spectrometry was set up in order to verify, respectively, the presence of Ce ions within the coating structure and its oxidation state. LIBS results confirmed the incorporation of Ce ions in the coating, which, according to UV-Vis measurements, are mainly in the (IV)-oxidation state.
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