基于氧化石墨烯/SiO_(2)的LAS玻璃薄膜涂层的制备及耐腐蚀性能研究

Preparation and Corrosion Resistance Performance ofGraphene Oxide/SiO_(2) Coatings on LAS Glass

本文在研究不同质量氧化石墨烯(GO)在水和乙醇中的分散性,以及GO粉末和GO水分散液与正硅酸乙酯(TEOS)水解液的复合分散作用的基础上,以TEOS和GO为原料,采用溶胶-凝胶法制备了GO/TEOS溶液,并使用旋涂法在锂铝硅(LAS)玻璃表面镀膜,分析了GO/二氧化硅(SiO_(2))膜层的表面形貌和断面形貌、断面元素分布,研究了GO/SiO_(2)膜层对LAS玻璃耐腐蚀性能的影响。结果表明,当GO质量为0.05 g、去离子水为15 mL时,GO在水中具有良好的分散性,加入TEOS水解液后可形成均匀镀膜液。将旋涂法表面镀膜后的LAS玻璃在氮气气氛和600℃热处理2 h后获得致密GO/SiO_(2)薄膜,碳元素分析表明,GO在膜层中均匀分布。对比分析无镀膜、SiO_(2)薄膜以及GO/SiO_(2)复合薄膜对LAS玻璃在盐酸(HCl, 1 mol/L)溶液、氢氧化钠(NaOH,质量分数5%)溶液中的腐蚀性的影响,证明GO/SiO_(2)复合薄膜可以提高LAS玻璃的耐酸腐蚀性能。

In the present work,the graphene oxide(GO)/tetraethyl orthosilicate(TEOS)aqueous solution was prepared by the sol-gel method after investigating the dispersibility of GO in water and ethanol,the complex dispersion of GO powder and its water solution in the hydrolysate of TEOS.The surface and cross section morphology,element distributions of the composite film were analyzed.The influence of GO/SiO_(2) film on the corrosion resistance of the glass was studied.The results show that 0.05 g GO can be well dispersed into 15 mL deionized water,and a uniform coating solution can be obtained with further TEOS hydrolysate addition.After heat treatment at 600℃for 2 h and under N 2 atmosphere,dense GO/SiO_(2) film can be obtained.The carbon element analysis shows graphene oxide was homogeneously distributed in the film.The corrosion behavior comparison of non-coated,SiO_(2) film coated and GO/SiO_(2) composite film coated LAS glass in HCl(1 mol/L)solution and NaOH(5%,mass fraction)solution confirmed that GO/SiO_(2) composite film can improve the acid corrosion resistance of LAS glass.