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| EFFECT OF TEMPERATURE ON STRUCTURE AND CORROSION RESISTANCE OF MODIFIED SILICA SOL COATINGS |
| CUI Xuejun1,2, LI Guojun2, DONG Hongliang2,REN Ruiming2 |
1. Key Laboratory of Materials Corrosion and Protection of Sichuan Colleges and Universities, Sichuan University of Science and Engineering, Zigong 643000
2. Liaoning Key Materials Laboratory for Railway,Dalian Jiaotong University, Dalian 116028 |
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Abstract Organic-inorganic hybrid transparent sol and coatings were prepared by sol-gel process, using methyltrimethoxysilane and industrial silica sol as raw materials. Thermal stability of the modified silica sol was investigated by TG-DTA. The results indicate that the coatings have good heat resistance, mass loss begins to increase obviously at about 512℃, and it is still less than 7%. The results of FTIR show that hydroxyls of the modified silica sol can completely cross-link at about 200℃ and C-Si bonds begin to decompose at about 512℃. Surface morphology and structure of the heat-treated coatings at different temperatures were also characterized respectively by optical microscope and XRD, and the results illustrate that the modified silica sol coatings are amorphous, transparent and dense, and can be stable even at 500℃ for 1 h. Corrosion resistance performance of the modified silica sol coatings applied on aluminum alloys was tested, and the results prove that the corrosion resistance is strengthened because coating becomes denser with increasing heat treatment temperature (≤500℃).
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Received: 01 March 2010
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Corresponding Authors:
CUI Xuejun
E-mail: cxj_2046@163.com
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