二氧化钛改性的环氧镁铝复合涂层对LY12铝合金的保护性能研究  

Research on the Protective Performance of TiO_(2) Modified Epoxy Magnesium AluminumComposite Coatings on LY12 Aluminum Alloy

作　　者：张培 周晓婷 聂国朝 冉晓姗 刘括 韦应 郑琪 Zhang Pei;Zhou Xiaoting;Nie Guochao;Ran Xiaoshan;Liu Kuo;Wei Ying;Zheng Qi(College of Chemistry and Food Science,Yulin Normal University,Yulin 537000,China;Yulin Center of Inspection and Testing for Food and Drug,Yulin 537000,China)

机构地区：[1]玉林师范学院化学与食品科学学院,广西玉林537000 [2]玉林市食品药品检验检测中心,广西玉林537000

出　　处：《云南化工》2024年第11期64-68,共5页Yunnan Chemical Technology

基　　金：玉林市科学研究与技术开发计划项目(玉市科202324145)。

摘　　要：为了提高涂层的屏蔽性和耐腐蚀性,将TiO_(2)改性的环氧镁铝复合涂层涂覆于LY12铝合金表面。采用厚度测试、马丘测试、腐蚀浸泡实验、X射线衍射分析、扫描电子显微镜等来确定镁粉和铝粉以及TiO_(2)在涂层中的最佳质量分数,以研究镁粉和铝粉及TiO_(2)对环氧镁铝复合涂层保护性能的影响。结果表明,添加镁粉和铝粉能显著增加复合涂层的厚度,TiO_(2)可以稍微增加涂层的厚度。复合涂层中镁粉与铝粉的最佳质量分数分别为30%、20%,而TiO_(2)在涂层中的最佳质量分数为3%。铝粉的加入可以降低涂层中镁粉的活性,TiO_(2)可以减少因镁粉溶解产生的涂层孔洞数量、孔隙率及涂层缺陷,抑制镁粉剧烈反应对涂层的破坏作用,显著提高铝合金表面环氧镁铝复合涂层的保护性能。In order to improve the shielding and corrosion resistance of the coatings,the modified epoxy magnesium aluminum composite coatings were prepared on aluminum alloy with adding TiO_(2) particles.The optimal mass fraction of magnesium and aluminum powders and the mass fraction of TiO_(2) added to the coatings were obtained through thickness testing,Machu testing,corrosion immersion experiments,X-ray diffraction,scanning electron microscopy.The influences of magnesium powders,aluminum powders,and titanium dioxide on the protective performances of epoxy magnesium aluminum composite coatings were studied.The results indicated that the addition of magnesium and aluminum powders increases the thickness of the epoxy magnesium aluminum composite coatings significantly,while the TiO_(2) could slightly increase the thickness of the coatings.The optimal mass fraction of magnesium and aluminum powders in the composite coatings were are 30%and 20%,respectively.Moreover,the optimal mass fraction of TiO_(2) in the coatings was 3%.The addition of aluminum powders could reduce the activity of magnesium powders in the coatings.On the other hand,the TiO_(2) could reduce the number of pores,porosity,and defects in the coatings caused by the dissolution of magnesium powders.Then the destructive effect of severe reaction of magnesium powders on the coatings was inhibited greatly.Thus the protective performances of epoxy magnesium aluminum composite coatings on aluminum alloy were improved significantly.

关 键 词：铝合金 环氧镁铝复合涂层 二氧化钛粒子 改性处理 耐腐蚀性能 

分 类 号：TQ630.72[化学工程—精细化工]