氟碳漆/碳纳米管导电防腐涂层的制备及表征  

Preparation and characterization of fluorocarbon-multiwall carbon nanotube composite coatings

作　　者：李娟[1] 冯拉俊[1] 李光照[1] 闫爱军 

机构地区：[1]西安理工大学材料科学与工程学院,西安710048 [2]中国大唐集团科学技术研究院有限公司西北分公司,西安710065

出　　处：《功能材料》2016年第3期232-236,242,共6页Journal of Functional Materials

基　　金：国家电网公司攻关资助项目(5226KY11003300);陕西省重点实验室资助项目(13Js078)

摘　　要：为了提高变电站接地网的服役寿命,采用刷涂法制备了氟碳漆/CNTs防腐导电涂层,测试了涂层的导电性、耐蚀性、接地电阻、SEM 以及热稳定性,研究了CNTs含量对涂层导电性、耐蚀性和接地电阻的影响.结果表明,在Q235钢接地网表面制备导电涂层后提高了接地网的耐蚀性. 当CNTs 含量在0.5%-2%（质量分数）的范围内涂层的腐蚀速率比普通碳钢小了两个数量级.涂层电阻率随CNTs含量的增加先减小后增大,当CNTs含量为1.5%（质量分数）时,涂层的电阻率最小,仅为4.5×10^-4（Ω·m）.复合涂层在300℃以下极为稳定,且涂层中的CNTs形成了网状导电结构,完全可以满足接地网导电防腐的使用要求.To enhance the service lifetime of Q235 substation grounding grid steel,fluorocarbon-multiwall carbon nanotube composite coatings deposited onto grounding grid substrates were prepared by brushing method.Various techniques such as resistivity,polarization curve,electrochemical impedance spectroscopy(EIS),and thermal gravimetric analysis were applied to characterize the properties of the composite coatings.The results showed that the corrosion resistance of Q235 substation grounding grid steel improved after prepared the composite coatings on its surface.When the content of the added multiwall carbon nanotube ranges from 0.5wt%to2wt%,the corrosion rates of the composite coatings were two orders of magnitude smaller than that of the Q235 substation grounding grid steel.The resistivity of the composite coatings first decreased and then increased with the increase of multiwall carbon nanotube content.The resistivity of the composite coatings reached a minimum value of 4.5×10-4(Ω·m)when the content of multiwall carbon nanotube was 1.5wt%.The composite coatings were extremely stable below 300 ℃,and the multiwall carbon nanotube formed network structure,which could meet the corrosion resistance demand of substation grounding grid completely.

关 键 词：氟碳漆/CNTs 涂层 导电性 耐蚀性 接地网 

分 类 号：TB332[一般工业技术—材料科学与工程]