Improving the corrosion performance of epoxy coatings by chemical modification with silane monomers
Improving the corrosion performance of epoxy coatings by chemical modification with silane monomers
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DOI：
10.1016/j.surfcoat.2006.09.100
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发表时间：
2007-01-15
影响因子：
5.4
通讯作者：
Cao, Chu-Nan
中科院分区：
文献类型：
--
作者：
Ji, Wei-Gang;Hu, Ji-Ming;Cao, Chu-Nan
在本文中，在有机锡化合物的催化下，用各种硅烷单体对工业环氧树脂进行化学改性，旨在提高2024-T3铝基环氧涂料的耐腐蚀性。在3.5 wt.% NaCl溶液中浸渍研究表明，硅烷改性后的涂层电容（C-c）显著降低，电化学阻抗谱（EIS）表明涂层具有更高的耐水渗透性能。EIS测试还表明，硅烷改性环氧涂层对基底腐蚀的保护能力增强，其特征是在基底/电解质界面处具有更高的电荷转移电阻（R-ct）和更低的双层电容（C-dl）。硅烷改性后，环氧涂料的附着力也有所提高。以3-缩水氧基丙基三甲氧基硅烷（GPTMS）改性的涂层体系性能最好。(c) 2006 Elsevier B.V.版权所有
In this communication, commercial epoxy resins were chemically modified with various silane monomers under the catalysis of organotin compound, aiming to enhance the corrosion resistance of epoxy coatings on 2024-T3 aluminum substrates. Immersion studies conducted in 3.5 wt.% NaCl solution showed that the coating capacitance (C-c) decreases significantly after the silane modification, as measured by electrochemical impedance spectroscopy (EIS), indicating the higher resistance to water permeation. EIS measurements also indicated an enhancement in protectiveness of silane-modified epoxy coatings against substrate corrosion, which was characterized by higher charge transfer resistances (R-ct) and lower double layer capacitance (C-dl) at substrate/electrolyte interface. The adhesion of epoxy coatings was also found to improve after the modification with silane components. The best performance was observed for coating system modified by 3-glycidoxypropyltrimethoxy silane (GPTMS). (c) 2006 Elsevier B.V. All rights reserved.