石墨烯改性水性环氧富锌防腐涂层的制备及耐蚀性研究  

Preparation and corrosion resistance of anticorrosive waterborne graphene-modified zinc-rich epoxy coating

作　　者：胡芳勇 喻唯 刘艳 代伟 杨辉帆 令狐茂亚 兰伟 HU Fangyong;YU Wei;LIU Yan;DAI Wei;YANG Huifan;LINGHU Maoya;LAN Wei(School of Metallurgy and Power Engineering,Chongqing University of Science and Technology,Chongqing 401331,China;Chongqing Key Laboratory of High-performance Corrosion-resistant Alloys,Chongqing 401331,China;Chongqing Coating Jia Technology Co.,Ltd.,Chongqing 401331,China;School of Chemistry and Chemical Engineering,Chongqing University of Science and Technology,Chongqing 401331,China)

机构地区：[1]重庆科技大学冶金与动力工程学院,重庆401331 [2]高性能耐腐蚀合金重庆市重点实验室,重庆401331 [3]重庆涂镀佳科技有限公司,重庆401331 [4]重庆科技大学化学化工学院,重庆401331

出　　处：《电镀与涂饰》2024年第8期107-117,共11页Electroplating & Finishing

摘　　要：[目的]将石墨烯(GE)作为改性剂引入水性环氧富锌(ZRE)涂层之中,探讨不同锌含量下添加石墨烯对其力学、电学及防腐性能的影响。[方法]通过划格附着力和耐冲击性测试考察了涂层的力学性能,根据表面电阻率、体积电阻率、吸水率和中性盐雾测试结果来评价石墨烯改性水性环氧富锌涂层的防腐效果。[结果]随着锌粉含量的增加,引入少量石墨烯能明显提高涂层的导电性和耐蚀性,但添加过多会导致涂层性能变差。综合力学、电学和耐腐蚀性能得出在锌含量70%的水性环氧富锌涂层中加入约0.9%的石墨烯效果最好。[结论]石墨烯添加量增大而导致的腐蚀微电池增多是涂层防腐蚀性能下降的主要因素,明确涂层中石墨烯与锌、铁之间的共存关系有望进一步提升水性环氧富锌涂层的综合性能。[Introduction]Graphene(GE)was introduced as a modifier into a waterborne zinc-rich epoxy(ZRE)coating,and the effect of the dosage of graphene on the mechanical,electrical,and anticorrosion properties of the ZRE coatings with different zinc contents was discussed.[Method]The mechanical properties of the coatings were examined by cross-cut adhesion test and impact resistance test.The anticorrosion performance of the GE-modified waterborne ZRE coating was evaluated according to the surface resistivity,electrical resistivity,water absorption,and neutral salt spray corrosion resistance.[Result]With the increasing of zinc content,the introduction of a small amount of graphene greatly improved the conductivity and corrosion resistance of the ZRE coating,but too much addition of graphene led to poor performance of the ZRE coating.Based on the mechanical,electrical,and anticorrosion properties,the ZRE coating with 70%of zinc and 0.9%of graphene was the best.[Conclusion]The formation of more and more corrosion microcells caused by the increase of graphene addition is one of the key factors leading to the decline of anticorrosion performance of the ZRE coating.Clarifying the coexistence relationship between graphene,zinc,and iron in the coating is expected to further improve the comprehensive performance of waterborne epoxy zinc-rich coatings.

关 键 词：水性环氧富锌涂料 石墨烯 改性 导电连接 防腐机理 

分 类 号：TQ637[化学工程—精细化工]