颜填料配比及颜料体积浓度对聚硫改性环氧涂层防腐性能的影响  

Ratio of Pigment and Filler and Pigment Volume Concentration on Corrosion Resistance of Polysulfide Modified Epoxy Coatings

作　　者：潘巍 李瑜[1] 辛颉 孙昭宜 王国荣 王清鑫 PAN Wei;LI Yu;XIN Jie;SUN Zhao-yi;WANG Guo-rong;WANG Qing-xin(Department of Foundation,Naval University of Engineering,Wuhan 430033,China;College of Naval Architecture&Ocean Engineering,Naval University of Engineering,Wuhan 430033,China)

机构地区：[1]海军工程大学基础部,武汉430033 [2]海军工程大学舰船与海洋学院,武汉430033

出　　处：《表面技术》2022年第3期138-150,共13页Surface Technology

摘　　要：目的 探究聚硫橡胶改性环氧树脂防腐涂层的颜填料最佳配比及临界颜料体积浓度。方法首先固定颜料体积分数(PVC)为15%,采用磷酸锌作为防锈颜料、湿法绢云母粉作为体质颜料,以液态聚硫橡胶(LP3)改性环氧树脂(E51)作为涂层的基体,制备聚硫改性环氧防腐涂料,测试涂层的基本物理性能。分别利用金相显微镜和扫描电镜(SEM)观察防腐涂层的表面形貌和截面形貌,同时利用电化学阻抗谱(EIS)技术探究颜填料配比对聚硫改性环氧涂层防腐性能的影响。选定最佳颜填料配比后,通过电化学阻抗谱(EIS)技术探究颜料体积浓度对聚硫改性环氧涂层防腐性能的影响。结果随着防锈颜料磷酸锌含量的降低,腐蚀介质穿透涂层的时间延长,停留在涂层-底材金属界面的时间缩短。当颜填料配比为3∶2时,涂层的防腐性能达到最优。当PVC≤20%时,涂层的防腐性能随着PVC的增大而提高;当PVC≥25%时,涂层的防腐性能迅速下降。结论当颜填料配比为3∶2、颜料体积浓度为20%时,涂层具有较好的物理性能和优异的防腐性能,因此该体系的临界颜料体积浓度(CPVC)为20%-25%。First fixed pigment volume concentration(PVC)was 15%,the zinc phosphate as antirust pigment,wet sericite powder as the inert pigment,with liquid polysulfide rubber(LP3)of modified epoxy resin(E51)as coating substrate,the preparation of modified polysulfide epoxy anticorrosive paint,testing the basic physical properties of the coating,respectively,by means of metallographic microscope and scanning electron microscope(SEM)to observe the surface morphology of coating and the cross section morphology,at the same time using electrochemical impedance spectroscopy(EIS)technique to explore the antirust pigment content on the properties of modified polysulfide epoxy anticorrosion coating.The influence of pigment volume concentration(PVC)on the anti-corrosion performance of polysulfide modified epoxy coating was investigated by electrochemical impedance spectroscopy(EIS).The results show that with the decrease of the content of zinc phosphate in antirust pigment,the time of the corrosive medium penetrating through the coating is prolonged,and the time of the corrosive medium remaining on the metal interface between coating and substrate is shortened.The anticorrosion performance of the coating reaches the best when the content of antirust pigment is 60%.When PVC≤20%,the anticorrosion performance of the coating increases with the increase of PVC,and when PVC≥25%,the anticorrosion performance of the coating decreases rapidly,so the critical pigment volume concentration(CPVC)of the system is between 20%-25%.In this system,when the content of antirust pigment is 60%and the volume concentration of pigment(PVC)is 20%,the coating has good physical properties and excellent anticorrosive performance.

关 键 词：防腐 涂层 防锈颜料 环氧树脂 聚硫橡胶 

分 类 号：TG172[金属学及工艺—金属表面处理]