摘要
用双子表面活性剂（GS）对氧化石墨烯（GO）进行插层改性,制备了改性氧化石墨烯（GSGO）,再以苯胺（An）为单体,过硫酸铵（APS）为引发剂,通过原位聚合法制备了GSGO/PANI复合材料,最后利用GSGO/PANI与水性醇酸树脂（WAR）共混得到了GSGO/PANI/WAR防腐涂层。采用FTIR、Raman、XRD和SEM等对GSGO和复合材料的形貌、结构进行了表征。结果表明,GS插入到GO的片层中,使得GO的层间距增大,且棒状的聚苯胺分散在GO的片层中,形成片状插层结构。动电位极化和电化学阻抗谱测试表明,GSGO/PANI/WAR复合涂层比纯WAR涂层具有更高的耐腐蚀性能。当复合涂层中GSGO含量为10%（以An的质量为基准,下同）时,GSGO/PANI/WAR-2涂层的耐腐蚀性能最好,极化电阻为7.98×10^7Ω·cm^2;腐蚀速率为1.26×10^–4 mm/a,阻抗值｜Z｜可达到5.25×106Ω·cm^2。与纯WAR相比,其腐蚀电流密度从9.82×10^–6A/cm2减小至1.08×10^–8 A/cm^2,腐蚀电位从–0.56 V增加到–0.28 V。
Gemini msurfactants （GS） modified graphene oxide （GO）, GSGO was prepared by intercalation method. Then, the as-prepared GSGO was used to produce GSGO/polyaniline （PANI） composites via an in situ chemical polymerization using aniline （An） as monomer, ammonium persulfate （APS） as initiator. Finally, blending of GSGO/PANI with waterborne alkyd resin （WAR） afforded GSGO/PANI/WAR anti-corrosion coatings. The structure and morphology of GSGO and GSGO/（PANI） composite were characterized by FTIR, Raman, XRD and SEM. The results showed that GS was intercalated into the layers of GO, and the interlayer spacing of GSGO were increased. Moreover, rod-like polyaniline was dispersed in GO sheet layers, forming flaky intercalation structure. Tafel polarization and electrochemical impedance spectroscopy （EIS） tests demonstrated that the GSGO/PANI/WAR composite coatings had higher corrosion resistance than pure WAR coating. The prepared GSGO/PANI/WAR-2 coating containing 10% GSGO （based on the mass of An, the same below） exhibited the best corrosion resistance with a polarization resistance of 7.98×10^7Ω·cm^2, the corrosion rate was 1.26×10^-4mm/a, and the impedance ｜Z｜ could reach 5.25×10^6Ω·cm^2. The corrosion current density was 1.08×10^-8 A/cm^2, lower than that of pure WAR coating （9.82×10^-6 A/cm^2）, and the corrosion potential was increased from -0.56 V to -0.28 V.
作者
邹明明
李小瑞
沈一丁
王海花
ZOU Ming-ming, LI Xiao-rui, SHEN Yi-ding, WANG Hai-hua(Key Laboratory of Auxiliary Chemistry ＆ Technology for Chemical Industry, Ministry of Education, Shaanxi University of Science ＆ Technology, Xi＇an 710021, Shaanxi, China)
出处
《精细化工》
EI
CAS
CSCD
北大核心
2018年第5期891-900,共10页
Fine Chemicals
基金
国家自然科学基金(21544011)
教育部留学回国人员科研启动基金(20121707)
陕西省教育厅重点实验室项目(14JS014)~~
