蒙脱石
腐蚀
溶胶凝胶
材料科学
化学工程
化学
冶金
复合材料
纳米技术
工程类
作者
Viviane Dalmoro,João Henrique Zimnoch dos Santos,Elaine Armelín,Carlos Alemán,Denise Schermann Azambuja
标识
DOI:10.1016/j.jcis.2014.04.021
摘要
The present work reports the production of films on AA2024-T3 composed of vinyltrimethoxysilane (VTMS)/tetraethylorthosilicate (TEOS) with incorporation of montmorillonite (sodium montmorillonite and montmorillonite modified with quaternary ammonium salt, abbreviated Na and 30B, respectively), generated by the sol–gel process. According to FT-IR analyses the incorporation of montmorillonite does not affect silica network. Electrochemical characterization was performed by electrochemical impedance spectroscopy measurement in 0.05 mol L−1 NaCl solution. Results indicate that montmorillonite incorporation improves the corrosion protection compared to the non-modified system. Scanning electron microscopy micrographs reveal that high concentrations of montmorillonite provide agglomerations on the metallic surface, which is in detriment of the anticorrosive performance. The VTMS/TEOS/30B films with the lowest concentration (22 mg L−1) of embedded clay provide the highest corrosion protection.
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