壳聚糖改性石墨相氮化碳/环氧树脂复合涂层的制备及防腐性能研究  

Preparation and Corrosion Resistance of Modified Graphite-phase Carbon Nitride/Chitosan Epoxy Resin Composite Coating

作　　者：杨康 杨留洋 范海明[2] YANG Kang;YANG Liuyang;FAN Haiming(Northwest Oil Field Company,SINOPEC,Urumqi 830011,China;School of Petroleum Engineering,China University of Petroleum(East China),Shandong Qingdao 266580,China)

机构地区：[1]中国石油化工股份有限公司西北油田分公司,乌鲁木齐830011 [2]中国石油大学(华东)石油工程学院,山东青岛266580

出　　处：《表面技术》2024年第12期102-113,共12页Surface Technology

基　　金：国家重点研发计划(2021YFE0107000);国家自然科学基金(52074339);山东省自然科学基金(ZR2021ME007)。

摘　　要：目的为了保证水性环氧树脂(EP)涂层的绿色、环保及高效防腐性能。通过将二维纳米材料石墨相氮化碳(g-C_(3)N_(4))与天然高分子壳聚糖(CS)功能化复合来制备一种新型绿色环氧树脂复合涂层体系,并研究不同g-C_(3)N_(4)@CS添加量对环氧树脂复合涂层耐蚀性的影响。方法将尿素高温煅烧得到g-C_(3)N_(4),加入壳聚糖悬浮液中进行改性处理,并掺杂进环氧树脂中进而得到新型环氧树脂复合体系(EP/g-C_(3)N_(4)@CS)。利用傅里叶红外变换光谱仪(FT-IR)、X射线衍射仪(XRD)及透射电子显微镜(TEM)对g-C_(3)N_(4)和g-C_(3)N_(4)@CS复合材料的结构及微观形貌进行表征。并通过电化学手段及长周期浸泡实验对涂层体系的防腐性能进行测试。结合涂层附着力测试判断涂层与基体之间的黏合程度。结果g-C_(3)N_(4)@CS可以被成功复合到环氧树脂涂层中,且CS中丰富的含氧官能团显著提高了g-C_(3)N_(4)在环氧树脂中的分散性和界面相容性。涂层电化学耐蚀性测试结果表明,EP/g-C_(3)N_(4)@CS-1.0%(质量分数)涂层体系在浸泡30 d后的涂层电阻(R_(c))值最大,在浸泡30 d后仍能达到1.11×10^(7)Ω,EP/g-C_(3)N_(4)@CS-1.0%(质量分数)涂层体系耐蚀性最高。此外,g-C_(3)N_(4)@CS可显著提升EP涂层的附着力,且EP/g-C_(3)N_(4)@CS-1.0%(质量分数)涂层附着力最大。长期浸泡实验测试结果也表明,EP/g-C_(3)N_(4)@CS-1.0%(质量分数)涂层体系具有最佳的耐蚀性,在浸泡30 d后表面膜层仍较为均匀平整。结论EP/g-C_(3)N_(4)@CS-1.0%(质量分数)涂层体系形成的均匀完整复合膜可以有效屏蔽腐蚀性离子的迁移进程,具有最佳耐蚀性能。The work aims to prepare a new green epoxy resin composite coating system by functionalized composite of two-dimensional nanomaterial,graphitic phase carbon nitride(g-C_(3)N_(4)),and the natural polymer chitosan(CS),and study the effect of different g-C_(3)N_(4)@CS additions on the corrosion resistance of the epoxy composite coating,so as to ensure the green,environmental protection and efficient corrosion resistance of water epoxy resin(EP)coating.The g-C_(3)N_(4)was obtained by high-temperature calcination of urea,which was added into chitosan suspension for modification treatment to obtain the novel nanofiller g-C_(3)N_(4)@CS.g-C_(3)N_(4)@CS with different mass fractions by doping into the epoxy resin.The structures and microscopic morphologies of g-C_(3)N_(4)and g-C_(3)N_(4)@CS composites were characterized by Fourier Transform Infrared Spectroscopy(FT-IR),X-ray Diffractometer(XRD),and Transmission Electron Microscopy(TEM).The corrosion resistance of the composite coating system was tested by electrochemical methods and long-term socking experiments.Combining the adhesion test of the coating,the adhesion between the coating and the substrate was determined.The results showed that g-C_(3)N_(4)@CS could be successfully compounded into the EP coating.The abundant oxygen-containing functional groups in CS could effectively improve the dispersion and interface compatibility of g-C_(3)N_(4)in epoxy resin.Electrochemical impedance spectroscopy test results indicated that the coating resistance(R_(c))value of EP/g-C_(3)N_(4)@CS-1.0wt.%coating system was the largest after 30 d of immersion,and it could still reach 1.11×10^(7)Ωafter 30 d of immersion.The EP/g-C_(3)N_(4)@CS-1.0wt.%coating system had the highest corrosion resistance.In addition,g-C_(3)N_(4)@CS could significantly improve the adhesion of EP coatings,and the EP/g-C_(3)N_(4)@CS-1.0wt.%coating had the highest adhesion.The results of long-term immersion test also showed that the surface film of the EP/g-C_(3)N_(4)@CS-1.0wt.%coating system had the best corro

关 键 词：石墨相氮化碳 壳聚糖 环氧树脂 耐腐蚀性能 涂层 腐蚀电化学 

分 类 号：TG174.4[金属学及工艺—金属表面处理]