铝合金表面新型有机-无机杂化纳米SiO_2涂层的制备及其性能  

Preparation and Properties of a Novel Organic-Inorganic Hybrid Nano-Silica Coating

作　　者：王秀华[1] 孙红霞[1] 刘守华[1] 沈业青[1] 

机构地区：[1]安徽师范大学化学与材料科学技术学院安徽省功能性分子固体重点实验室,安徽芜湖241000

出　　处：《材料保护》2008年第7期42-44,共3页Materials Protection

基　　金：安微师范大学校青年基金(2007xqn69)资助

摘　　要：为了提高铝合金的耐腐蚀性能、耐磨损性能及硬度,通过溶胶-凝胶反应,以纳米硅溶胶为主要原料,有机硅烷为偶联剂,制备了新型纳米SiO2防腐蚀涂料。通过浸渍-提拉法在铝合金(LY12)基体表面形成涂层,通过改变硅溶胶的含量,详细研究了此涂层的显微硬度、耐磨性能和耐腐蚀性能与硅溶胶含量的关系。结果显示,新型有机-无机杂化纳米SiO2涂层厚度为20μm时具有良好的耐腐蚀性能和耐磨性能,由此而使此杂化膜替代对环境有害的铬酸盐转化膜成为可能,并为有机-无机杂化纳化材料的应用提供了理论依据。A novel nano-silica anticorrosion paint was prepared by sol-gel process,using colloidal silica nanoparticles as the raw materials and silane as the coupling agent,aiming at increasing the corrosion resistance,wear resistance,and hardness of Al alloys.The resulting paint was dip-coated onto LY12 Al alloy.The relationship among the content of silica sol and the microhardness,wear resistance,and corrosion resistance of the coatings was investigated.Results indicated that the as-prepared organic-inorganic hybrid nano-silica coatings had a thickness of about 20 μm,and they showed good corrosion resistance and wear resistance.This maked it possible to use the novel chromate-free hybrid coatings as replacements of traditional chromate-based toxic conversion coatings for long-term and environmentally benign corrosion protection of Al alloys and could provide experimental guidance as well to the application of organic-inorganic hybrid materials.

关 键 词：有机-无机杂化 纳米涂层 耐腐蚀性能 溶胶-凝胶 LY12铝合金 

分 类 号：TG174.4[金属学及工艺—金属表面处理]