| Autor: |
Gopalakrishnan Rajagopal, Kuppaianpoosari Maruthan, S. Palraj, M. Selvaraj |
| Rok vydání: |
2015 |
| Předmět: |
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| Zdroj: |
Progress in Organic Coatings. 81:132-139 |
| ISSN: |
0300-9440 |
| DOI: |
10.1016/j.porgcoat.2015.01.005 |
| Popis: |
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 × 10 6 Ω cm 2 after 30 days of immersion in 3% NaCl solution, whereas micro silica incorporated coatings showed a resistance of 5.41 × 10 4 Ω cm 2 under similar conditions. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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