Corrosion and wear resistance behavior of nano-silica epoxy composite coatings

被引:84
作者
Palraj, Sironmani [1 ]
Selvaraj, Muthiah [1 ]
Maruthan, Kuppaianpoosari [1 ]
Rajagopal, Gopalakrishnan [1 ]
机构
[1] CSIR, Cent Electrochem Res Inst, Corros & Mat Protect Div, Karaikkudi 630006, Tamil Nadu, India
关键词
Coatings; Electron microscopy; Electrochemical techniques; Abrasion; ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY; TRIBOLOGICAL PERFORMANCE; GROWTH; SIZE;
D O I
10.1016/j.porgcoat.2015.01.005
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
Recent developments made in the synthesis of nano-materials have demonstrated their contribution in the field of protective coatings. Sol gel method is the simple and elegant technique for the preparation of nanosilica particles. The nano-silica composites were prepared by mixing the epoxy compounds and polyamide hardener and characterized by using X-ray powder diffraction (XRD), thermal analysis (TGA and DTA), FT-IR spectroscopic technique and SEM analysis. The size of the nano particles was confirmed by transmission electron microscopy (TEM). Mechanical properties of the nano-silica epoxy composites were determined by ASTM method. The wear index data of the nano-silica incorporated epoxy composite were found to be 32 mg/1000 cycles. Corrosion performance was evaluated by salt spray test and electrochemical impedance measurements. The nano-silica epoxy composite coatings withstood 720 h in salt spray test, whereas the micro silica coatings withstood up to 650 h. Electrochemical impedance spectroscopy results of the nano-silica epoxy composite coatings showed a resistance of 2.36 x 10(6) Omega cm(2) after 30 days of immersion in 3% NaCl solution, whereas micro silica incorporated coatings showed a resistance of 5.41 x 10(4) Omega cm(2) under similar conditions. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码:132 / 139
页数:8
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