输电铁塔塔脚防护用无溶剂环氧涂料的研制及其防腐性能研究

Development of Solvent-Free Epoxy Coating for Protection of Transmission Tower Foot and Study on Its Anticorrosion Performance

输电线路塔脚腐蚀影响线路的安全运行,环境污染和铁塔保护帽积水易造成铁塔主材与保护帽连接处发生锈蚀失效。开发了一种输电铁塔塔脚防护用无溶剂环氧防腐涂料,该涂料具有粘度低、流平性好和施工方便等优点。采用电化学测试技术和盐雾实验研究无溶剂涂料的防腐性能,并考察了硅烷偶联剂对涂层防腐性能和附着力的影响。结果表明:制备的无溶剂环氧防腐涂料具有良好的渗透性能和防腐性能,并可对铁塔保护帽进行带锈施工,无溶剂涂层/混凝土体系在盐雾试验箱中试验2000h后,涂层完整,没有起泡或剥落现象。硅烷偶联剂KH560不仅将涂层附着力从5.6提高到8.9MPa,还能有效增强涂层的柔韧性和耐水性能。

The corrosion of transmission tower foot affected the safe running of the transmission line.The joint between main materials of the steel tower and the protective cap was easily corroded due to the environmental pollution and sedimentary water deposited from the protection cap.A kind of solvent-free anti-corrosive epoxy coatings used for transmission tower foot protection was developed.These coatings owned the advantages of low viscosity,good leveling,and convenient construction.The corrosion performance of the solvent-free coating was investigated by electrochemical test and salt spray test.The effect of silane coupling agent on the corrosion resistance and adhesion of the coating was also studied.Results indicated that the prepared solvent-free anticorrosive epoxy coating exhibited good permeability and anticorrosion properties,and could be constructed in the presence of rust.When the solvent-free coating/concrete system was tested in a salt spray chamber for 2000 h,the coating was complete without foaming or peeling.The silane coupling agent KH560 not only improved the adhesion of the coating from 5.6 to 8.6 MPa but also effectively enhanced the flexibility and water resistance of the coating.