纳米SiO_2及无机盐改性丙烯酸树脂-有机硅烷复合钝化膜的耐蚀性能  

Corrosion Resistance of Nanoscale Silica- Nickel Acetate Modified Acrylate Resin /Organic Silane Composite Passivation Film

作　　者：汤晓东[1] 陆伟星[2] 田飘飘[1] 徐丽萍[1] 吴晓红[2] 张千峰[1] 

机构地区：[1]安徽工业大学分子工程与应用化学研究所,安徽马鞍山243002 [2]上海梅山钢铁股份有限公司技术中心,江苏南京211100

出　　处：《材料保护》2014年第1期17-20,8,共4页Materials Protection

基　　金：科技部863计划新材料研究专题(2009AA 03Z529)资助

摘　　要：为了提高丙烯酸树脂类钝化膜的耐蚀性能,以三甲基氯硅烷对纳米SiO2进行表面改性,制成分散液后与硅烷偶联剂KH-563、丙烯酸树脂及无机盐Ni(CH3COO)2等复配成无铬钝化液,对热镀锌板进行复合钝化。采用红外光谱测试了改性纳米SiO2的结构,采用粒度仪分析其粒径;利用扫描电镜和能谱分析了复合钝化膜的微观形貌和成分;采用电化学及中性盐雾试验分析了复合钝化膜的耐蚀性能。结果表明:纳米SiO2改性后,表面能降低,分散性良好;改性纳米SiO2与丙烯酸树脂发生交联作用,形成了网状结构,提高了复合钝化膜的致密性;复合钝化耐蚀性能较丙烯酸树脂钝化膜及热镀锌板显著提高。The surface of nano- SiO2was modified by trimethyl chlorosilane.Resultant modified nano-SiO2was then prepared into dispersion and mixed with silane coupling agent KH-563,acrylate resin and nickel acetate [Ni( CH3COO)2] to afford Cr-free passivation fluid. The passivation fluid was adopted to passivate hot galvanized steel sheet so as to improve the corrosion resistance. The chemical structure of nano-SiO2modified by trimethyl chlorosilane was analyzed with an infrared spectrometer,and its grain size was determined with a grit size analyzer. The morphology and composition of as- prepared composite passivation film were analyzed with a scanning electron microscope and an energy dispersive spectrometer,and its corrosion resistance was evaluated by electrochemical tests and neutral salt-spray test. Results showed that modified nano-SiO2had reduced surface energy and good dispersion,and it was able to form network-like structure by participating in cross-linking with acrylate resin thereby increa-sing the compactness of the composite passivation film. As a result,as-prepared composite passivation film possessed much better corrosion resistance than acrylate resin passivation film and hot galvanized steel sheet substrate as well.

关 键 词：纳米SIO2改性 丙烯酸树脂 Ni(CH3COO)2 复合钝化膜 耐蚀性能 热镀锌板 

分 类 号：TG174.4[金属学及工艺—金属表面处理]