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.
出处
《材料保护》
CSCD
北大核心
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
