抗腐蚀蔓延水性环氧富锌涂料的制备与性能  

Preparation and properties of a waterborne zinc-rich epoxy paint with high corrosion spread prevention performance

作　　者：康鑫 时卓 孙连来 郭建 高琳琳 于勐 KANG Xin;SHI Zhuo;SUN Lianlai;GUO Jian;GAO Linlin;YU Meng(Liaoning Light Industry Science Research Institute Co.,Ltd.,Shenyang 110031,China)

机构地区：[1]辽宁省轻工科学研究院有限公司,辽宁沈阳110031

出　　处：《电镀与涂饰》2024年第6期148-157,共10页Electroplating & Finishing

摘　　要：[目的]要延长涂层的使用寿命,需阻止腐蚀介质沿着涂层被划伤的部位侵入而腐蚀金属基材,抑制腐蚀蔓延。[方法]选用环氧树脂乳液、胺类固化剂、颜填料、腐蚀抑制剂及其他助剂制备了一种具有优异抗腐蚀蔓延能力的水性环氧富锌涂料,讨论了成膜物质含量、固化剂种类和颜填料复配形式对涂层耐蚀性的影响,探讨了涂层抗腐蚀蔓延的机理。[结果]在成膜物质的质量分数为15%,选用聚酰胺固化剂,以绢云母、超磷锌白和石墨烯作为颜填料,并加入适量腐蚀抑制剂的情况下,所制备的涂料综合性能最好,其涂层经中性盐雾试验2 160 h后依然具有良好的附着力,平均扩蚀宽度仅为1.43 mm。[结论]腐蚀抑制剂对涂层湿态附着力的提升,以及石墨烯对锌粉利用率的提升,共同赋予了该涂层优异的抗腐蚀蔓延性能。[Introduction]To extend the service life of a coating,the spread of corrosion needs to be suppressed when the coating is damaged by preventing the diffusion of corrosive media through the scratch of the coating and further corrosion of the metal substrate.[Method]A waterborne zinc-rich epoxy paint with excellent corrosion spread prevention performance was prepared with epoxy emulsion,amine curing agent,pigments,fillers,corrosion inhibitor,and some auxiliary agents.The effects of the content of film-forming substance,the type of curing agent,and the combination of pigments and fillers on corrosion resistance of the coating were studied.The corrosion spread prevention mechanism of the coating was discussed.[Result]The paint prepared with 15%(mass fraction)of filmforming substance and a suitable amount of corrosion inhibitor by using polyamide as curing agent and combining sericite,superphosphate zinc white,and graphene as pigments and fillers showed the best comprehensive performance.After 2160 hours of neutral salt spray test,its coating still had good adhesion to the substrate with an average corrosion propagation width of only 1.43 mm.[Conclusion]Both the improvement of wet adhesion of the coating by the addition of corrosion inhibitor and the improvement of the utilization rate of zinc powder by the addition of graphene give the coating excellent corrosion spread prevention performance.

关 键 词：水性环氧富锌涂料 固化剂 颜填料 腐蚀抑制剂 抗腐蚀蔓延 

分 类 号：TQ632.4[化学工程—精细化工]