功能化MWCNTs/Ag对环氧涂料耐腐蚀和防污性能的影响  

Effect of Functionalized MWCNTs/Ag on Corrosion and Fouling Resistance of Epoxy Coatings

作　　者：蔡灿海 刘灿森 陈青梅 揭晓华[1] CAI Canhai;LIU Cansen;CHEN Qingmei;JIE Xiaohua(School of Materials and Energy,Guangdong University of Technology,Guangzhou 510006,China;Guangdong Key Laboratory of Advanced Manufacturing Technology of Marine Energy Equipment,Guangdong University of Technology,Guangzhou 510006,China)

机构地区：[1]广东工业大学材料与能源学院,广州510006 [2]广东工业大学广东省海洋能源装备先进制造技术重点实验室,广州510006

出　　处：《表面技术》2024年第22期102-113,共12页Surface Technology

基　　金：广州市科技计划(202201010495)。

摘　　要：目的研究聚多巴胺(PDA)改性的MWCNTs/Ag复合材料(MWCNTs/Ag@PDA)对水性环氧树脂涂层结构、耐腐蚀性和防污性能的影响。方法首先制备MWCNTs/Ag复合材料,并利用聚多巴胺(PDA)对其进行改性,最后将不同的复合粉末加入水性环氧树脂中制备复合涂层,通过XRD、拉曼、XPS和SEM对不同粉末的形貌结构以及不同复合涂层的氮脆截面形貌进行分析。通过黏附力,EIS、极化以及抗三角褐指藻的防污测试对涂层的机械性、耐腐蚀性以及防污性能进行检测。结果MWCNTs成功负载纳米Ag颗粒,PDA对MWCNTs/Ag改性后,改善了MWCNTs/Ag在环氧树脂中的分散性。随着复合粉末填料的添加,涂层的黏附力升高,添加MWCNTs/Ag@PDA的复合涂层黏附力最高为4.29 MPa。在3.5%(质量分数)NaCl中浸泡28 d之后,空白涂层和添加MWCNTs/Ag的环氧涂层(MA/WEP)的耐腐蚀性能与浸泡初期相比都大幅下降,而添加MWCNTs/Ag@PDA的环氧涂层(MAP/WEP)没有变化。在三角褐指藻海水溶液中浸泡7d之后,MAP/WEP表面的海藻最少,且该涂层表面会释放Ag^(+),会破坏附着在涂层表面三角褐指藻结构的完整性,使其失活。结论PDA能够明显改善MWCNTs/Ag复合材料在环氧树脂中的分散性,且添加MWCNTs/Ag@PDA可以提升涂层的黏附力,增强涂层的耐腐蚀性能和防污性能。The work aims to study the effects of MWCNTs/Ag@PDA composites on the structure,mechanical properties,corrosion resistance and antifouling properties of water-based epoxy resin coatings.In this experiment,MWCNTs were used as carrier loaded silver nanoparticles and then modified with PDA.Finally,the composite powder was added to the water-based epoxy resin to improve its mechanical properties,corrosion resistance and antifouling properties.The results of XRD,Raman,XPS and SEM showed that Ag particles were loaded on MWCNTs and modified by PDA.MWCNTs/Ag@PDA composites were successfully prepared.The results of the binding force test showed that the adhesion of the composite coating was improved compared with that of blank coating after addition of composite powder.Among them,MAP/WEP coating had the best adhesion of 4.29 MPa.The corrosion resistance mechanism of fillers in coatings could be analyzed based on the nitrogen brittle cross-section morphology of coatings,EIS test of coatings,and fitting results of EIS test data.In the SEM results of nitrogen embrittlement cross section,there were obvious shrinkage holes in the section of the blank coating.After the addition of MWCNTs/Ag,the density of the epoxy coating became higher,but the agglomeration of MWCNTs/Ag and poor compatibility with the coating led to defects in MA/WEP.However,PDA improved the dispersion of MWCNTs/Ag in the epoxy resin,resulting in a higher density coating without defects.The different coatings were soaked in a 3.5wt.%NaCl solution for 28 d,and then the electrochemical properties of the different coatings were tested by an electrochemical workstation.In EIS tests,MAP/WEP had the largest capacitance arc radius and the largest low-frequency resistance modulus value.At the same time,MAP/WEP had the widest high phase frequency region.The results of the Tafel curve showed that the addition of powder could increase the corrosion potential and decrease the corrosion current density.When MWCNTs/Ag@PDA were added,MAP/WEP had the highest corrosion potenti

关 键 词：MWCNTS 纳米AG 纳米复合材料 PDA改性 耐腐蚀 防污 

分 类 号：TG174[金属学及工艺—金属表面处理]