不锈钢表面聚苯胺纳米纤维/改性氧化石墨烯/水性环氧复合涂层的制备与防护性能研究  

Corrosion Behavior of PANI Nanofiber/Modified GO/Waterborne Epoxy Composite Coating on Stainless Steel

作　　者：李建永 代殿宇 钱程 刁书磊 刘金山 路通鑫 孙勇 肖凤娟 LI Jianyong;DAI Dianyu;QIAN Chen;DIAO Shulei;LIU Jinshan;LU Tongxin;SUN Yong;XIAO Fengjuan(Shijiazhuang Yida Henglian Road and Bridge Materials Co.Ltd.,Shijiazhuang 050000,China;School of Material Scinece and Engineering of Shijiazhuang Tiedao University,Hebei Key Laboratory of Advanced Materials for Transportation Engineering and Environment,Shijiazhuang 050043,China)

机构地区：[1]石家庄市易达恒联路桥材料有限公司,石家庄050000 [2]石家庄铁道大学材料科学与工程学院河北省交通工程与环境协同发展新材料重点实验室,石家庄050043

出　　处：《中国腐蚀与防护学报》2022年第1期156-162,共7页Journal of Chinese Society For Corrosion and Protection

基　　金：河北省重点研发计划(17273702D);河北省建设科技计划(2016210)。

摘　　要：在氧化石墨烯纳米片(GO)改性的基础上,于非盐酸介质中采用原位共聚法合成了聚苯胺纳米纤维/改性氧化石墨烯复合材料(PANI-F/CTGO),将其作为防腐增效组分引入到水性环氧聚合物乳液(WEP)中构建复合涂料。采用电化学方法和盐雾实验研究了涂料在加速腐蚀条件下对不锈钢的腐蚀防护作用,对腐蚀产物结构进行了分析。复合材料中PANI-F与CTGO的化学键接提高了PANI-F/CTGO在环氧乳液中的分散性和相容性。非盐酸介质条件下制备的PANI纳米纤维没有腐蚀介质盐酸的引入,在涂层中能发挥出更好的耐蚀性;PANI-F/CTGO/WEP涂层具有较高的开路电位(OCP)值和阻抗模,耐盐雾时间达到720 h,显示了优异的防腐性能,这主要是PANI-F/CTGO的主动钝化与物理阻隔协同作用的结果。Composite of polyaniline nanofiber/modified graphene oxide(PANI-F/CTGO) was synthesized by in-situ copolymerization in a non-hydrochloric acid medium. PANI-F/CTGO was introduced into waterborne epoxy polymer emulsion(WEP) as an anti-corrosion component to form composite coatings.The anticorrosion effect of the composite coating on stainless steel was assessed by means of salt spray test, electrochemical method, Fourier transform infrared spectroscope, SEM and XRD. Results show that the chemical bonding between PANI-F and CTGO improved the dispersion and compatibility of PANI-F/CTGO in epoxy emulsion. PANI nanofibers prepared in non-hydrochloric acid medium is conducive to better corrosion resistance of the coating due to that there is no corrosive HCl was involved into the prepared coating. PANI-F/CTGO/WEP coatings showed high open circuit potential and impedance modulus in 3.5%NaCl solution after salt spray test for 240 h, indicating their excellent corrosion protection performance. Meanwhile, the mechanism of synergism of active passivation and physical barrier of PANI-F/CTGO was revealed.

关 键 词：非盐酸法原位聚合 PANI纳米纤维 改性GO纳米片 水性环氧复合涂层 协同作用 

分 类 号：TG172[金属学及工艺—金属表面处理]