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| Electrochemical Corrosion Behavior of Silicone-epoxy Hybrid Coatings on LY12 Aluminum Alloy Electrode |
| YUAN Xin, YUE Zhufeng, WEN Shifeng, LI Lei |
| Advanced Material Test Center, School of Mechanics and Civil & Architecture, Northwestern Politechnical University, Xi'an 710129, China |
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Abstract Corrosion behavior of LY12 aluminum alloy electrodes coated with silicone-epoxy hybrid coating in 5%NaCl solution was investigated by means of electrochemical impedance spectroscopy (EIS) measurement, while impedance models related to different immersion stages were also proposed. The results indicated that the reaction process of the coating during immersion presented three stages: the initial stage, water was absorbed in the silicone-epoxy hybrid coating; the middle stage, the hydrolysis and poly-condensation of alkoxy-silicone occurred in the coating; and then the coating acted as a protective barrier in the third stage. Analysis of the impedance parameters revealed that the silicone hydrolysis and poly-condensation enhanced the density and the degree of crosslinking of the coating. Therefore, during immersion the coating systems exhibited characteristics of inherent repairing or re-healing.
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Received: 03 September 2013
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