不同苯并三氮唑(BTA)添加量对BTA@PHVA/PEI环氧涂层防护性能的影响  

Effect of Different Benzotriazole(BTA)Additions on Protective Properties of BTA@PHVA/PEI Epoxy Coatings

作　　者：慕仙莲 张馨月 郁大照 刘元海 刘杰 MU Xianlian;ZHANG Xinyue;YU Dazhao;LIU Yuanhai;LIU Jie(Key Laboratory of Structural Corrosion Protection and Control Aviation Technology,China Institute of Special Aircraft,Hubei Jingmen 448035,China;School of Chemistry and Chemical Engineering,Yantai University,Shandong Yantai 264005,China;School of Aviation Foundation,Naval Aeronautical University,Shandong Yantai 264000,China)

机构地区：[1]中国特种飞行器研究所结构腐蚀防护与控制航空科技重点实验室,湖北荆门448035 [2]烟台大学化学化工学院,山东烟台264005 [3]海军航空大学航空基础学院,山东烟台264000

出　　处：《表面技术》2024年第14期87-95,共9页Surface Technology

基　　金：国家自然科学基金(51971192);山东省自然科学基金(ZR2020ME132,ZR2022QE155)。

摘　　要：目的通过制备装载苯并三氮唑(BTA)的杂化凝胶(BTA@PHVA/PEI),并将其添加至环氧(EP)涂层中研究不同苯并三氮唑添加量对BTA@PHVA/PEI环氧涂层防护性能的影响。方法通过自由基聚合法制备BTA@PHVA/PEI,将其添加至环氧涂层中制备BTA@PHVA/PEI环氧复合涂层。通过红外光谱、扫描电子显微镜、热重分析等手段对制备的BTA@PHVA/PEI进行结构表征。在3.5%(质量分数)NaCl溶液中开展模拟海水浸泡试验。对涂层附着力、电化学阻抗谱和涂层腐蚀形貌进行表征分析。结果成功制备了装载缓蚀剂BTA的杂化凝胶BTA@PHVA/PEI;浸泡300 h后,BP-1/EP涂层、BP-2/EP涂层和BP-3/EP涂层附着力分别下降了55.7%、53.9%和58.2%,明显低于相同条件下EP涂层的附着力损失值(60.4%);在相同条件下,BTA@PHVA/PEI涂层始终具有更高的阻抗值。浸泡300h后,BTA@PHVA/PEI涂层的阻抗值为3.36×10^(5)Ω·cm^(2),比EP涂层阻抗值高1个数量级。结论BTA@PHVA/PEI中的硅氧烷结构能提高环氧涂层交联密度,降低腐蚀性粒子的渗透速率,使BP/EP涂层具有更高的附着力。在同等实验条件下,BTA@PHVA/PEI环氧涂层的防护效果更优,这主要是因为BTA中N原子的孤电子对与Fe原子的空轨道在金属基体表面形成了吸附膜和PHVA/PEI凝胶的三维网络具有屏蔽作用。Heterogeneous gels(BTA@PHVA/PEI)loaded with benzotriazole(BTA)were successfully prepared by free radical polymerization and added to epoxy coatings to prepare BTA@PHVA/PEI epoxy composite coatings.The effect of different benzotriazole additions on the protective properties of BTA@PHVA/PEI epoxy composite coatings was investigated by preparing BTA@PHVA/PEI with different BTA additions.FT-IR,SEM and TG were used to investigate the structural properties of the prepared BTA@PHVA/PEI.The findings revealed that the surface of the PHVA/PEI hybrid gel created a large number of folds and pores due to electrostatic repulsion,which provided space for storing water and loading BTA.The loading of BTA had little effect on the chemical structure of the PHVA/PEI hybrid gel.The loading of BTA in the BTA@PHVA/PEI prepared with different BTA additions was 10.7wt.%,14.2wt.%and 18.1wt.%,respectively.The prepared coatings(EP coating,BP-1/EP coating,BP-2/EP coating and BP-3/EP coating)were immersed in a 3.5wt.%NaCl solution to simulate seawater immersion tests.Adhesion tests,electrochemical impedance spectroscopy and electron microscopy were used to evaluate and analyze the corrosion resistance of coatings.The results showed that the BTA@PHVA/PEI epoxy coatings had higher adhesion compared with the epoxy coatings due to the siloxane structure in BTA@PHVA/PEI which improved the compatibility of the gel with the organic coating and increased the degree of cure of the epoxy coating.After 14 days of immersion,the adhesion of BP-1/EP coatings,BP-2/EP coatings and BP-3/EP coatings decreased by 55.7%,53.9%and 58.2%,respectively,which was less than the reduction in adhesion for EP coatings(60.4%).The reason for that while the siloxane structure increased the degree of curing of the epoxy coatings,the N and Zn atoms in the BTA@PHVA/PEI in the BP/EP coatings enhanced the adhesion.At the same immersion time,the BTA@PHVA/PEI coatings always had higher impedance values,while the impedance values of the EP coatings decreased to 5.39×10^(4)Ω·cm^(

关 键 词：苯并三氮唑 杂化凝胶 防护性能 环氧涂层 电化学阻抗谱 

分 类 号：TG174.4[金属学及工艺—金属表面处理]