摘要
通过甲基三甲氧基硅烷的水解-缩聚对工业硅溶胶改性,获得了透明的改性硅溶胶及涂层。用热重/差热法(TG-DTA)对硅溶胶改性前后涂层的热性能进行表征,结果表明改性硅溶胶涂层具有一定的耐高温性能。在512℃左右开始发生明显的失重,质量损失小于7%;傅里叶红外光谱(FTIR)分析表明改性硅溶胶涂层内部的大量羟基在200℃左右交联固化完全,在500℃左右发生Si-C键的燃烧分解;XRD分析表明改性硅溶胶涂层由非晶态物质构成,500℃左右的热处理涂层未晶化;光学显微镜观察及耐腐蚀性分析结果表明,改性硅溶胶涂层表面光滑致密,并具有一定的耐腐蚀性能,随热处理温度(≤500℃)的升高,涂层更致密,耐腐蚀性能增强。
Organic-inorganic hybrid transparent sol methyltrimethoxysilane and industrial silica sol as raw and coatings were prepared by sol-gel process, using 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 ℃）.
出处
《中国腐蚀与防护学报》
CAS
CSCD
北大核心
2011年第2期155-159,共5页
Journal of Chinese Society For Corrosion and Protection
基金
辽宁省计划资助(2008402024)项目
关键词
涂料
成膜物质
甲基三甲氧基硅烷
硅溶胶
耐蚀性
coatings, film-forming substance, methyltrimethoxysilane, modified silica sol, corrosion resistance
