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| ANTI-CORROSION PROPERTIES OF EPOXY COATINGS MODIFIED BY NANO-SiO2 |
| TIAN Huiwen1; LI Weihua1; ZONG Chengzhong2; HOU Baorong1 |
1. Key Laboratory of Corrosion Science in Shandong; Institute of Oceanology; Chinese Academy of Sciences; Qingdao 266000
2. Qingdao University of Science and Technology; Qingdao 266000 |
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Abstract Electrochemical impedance spectroscopy (EIS) was employed to investigate the corrosion regulations of nano-SiO2 modified epoxy coatings on carbon steel in 3.5 mass% NaCl solution, coupled with capacitance and gravimetric methods. The water uptake behavior of modified coatings was analysed. Four systems were studied, which are clear coating and three pigmented coatings (with 1%,2%,3% mass
percentage nano-SiO2). The EIS results showed that nano-SiO2 particle could improve the anti-corrosion performance of the coatings, and the optimal additions is 2%. The results obtained by capacitance and gravimetric methods showed that the diffusion process of water through epoxy coatings with different PVC(pigment volume concentration) followed the second Fick diffusion law in the initial period. Adding the nano-SiO2 into epoxy coatings can act effectively. The positive one is attributed to the reaction between nano powder and epoxy resin, which improve the barrier effectiveness of coatings. The negative one is to increase the number of pores in the coatings when the adding amount is beyond the critical pigment volume concentration.
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Received: 18 June 2008
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Corresponding Authors:
LI Weihua
E-mail: liweihua@ms.qdio.ac.cn
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