环氧富锌涂层配套体系长效防护性能研究  

Research on the Long-Lasting Protection Performance of Epoxy Zinc-Rich Coating Supporting System

作　　者：刘凯吉 赵慧宇 曲政[1,2] 董彩常 丁国清[1,2] 刘雯 LIU Kai-ji;ZHAO Hui-yu;QU Zheng;DONG Cai-chang;DING Guo-qing;LIU Wen(Qingdao Marine Corrosion Research Institute Co.,Ltd.,Cenrtal Research of Iron and Steel,Qingdao 266071;Qingdao NCS Testing&Protection Technology Co.,Ltd.,Qingdao 266071;CHINA STATE SHIPBUILDING CORPORATION LIMITED,Huludao 125000)

机构地区：[1]钢铁研究总院青岛海洋腐蚀研究所有限公司,青岛266071 [2]青岛钢研纳克检测防护技术有限公司,青岛266071 [3]中国船舶集团渤海造船有限公司,葫芦岛125000

出　　处：《环境技术》2024年第3期30-37,共8页Environmental Technology

基　　金：科技基础资源调查专项:丝绸之路经济带与极地材料腐蚀及环境因素科学调查,项目编号:2019FY101402。

摘　　要：在热带沿海地区,高湿热、高盐和高辐照是一种极端严酷的腐蚀环境。在这类特殊条件下,金属材料的腐蚀失效问题已成为制约装备发展与应用的重大瓶颈,而目前工程中常用的环氧富锌涂层在此类严酷恶劣环境下的长效防护性能还缺乏深入研究。本文通过进行紫外/凝露、中性盐雾、湿热试验的循环试验,研究了环氧富锌涂层配套体系在高湿热、高盐和高辐照的腐蚀环境下对碳钢的长期保护性能,通过附着力、涂层划痕处腐蚀蔓延宽度、表面微观形貌和电化学阻抗谱等方法对涂层的防腐性能进行研究。结果表明:经过175 d的循环加速腐蚀试验后,在不同周期36 d、70 d、100 d、175 d的附着力相对于初始附着力(10.45 MPa),下降率分别为4.3%、10.0%、13.2%、18.7%,尽管附着力有所降低,但下降幅度不大。划痕处在不同周期36 d、70 d、100 d、175 d的腐蚀蔓延宽度分别为0.75 mm、1.25 mm、1.74 mm和2.38 mm,均小于富锌底漆涂料规定的≤3 mm。SEM观察结果显示,在涂层暴露的四个周期内,涂层表面产生明显变化,试验后期生成大量块状产物。EIS结果显示,涂层的阻抗数值在36d~100d的过程中呈现出逐渐降低的过程,从2.93×10^(10)Ω·cm^(2)到6.148×10^(9)Ω·cm^(2),而在(100~175)d时,感抗弧的半径大小有一个小幅度的增大,阻抗谱没有出现第二个时间常数,可以说明环氧富锌涂层配套体系在这类环境下仍能保持完整和均匀,这与涂层中锌粉的阴极保护作用有关。研究结果表明环氧富锌涂层配套体系在此类严酷的腐蚀环境中仍然具有优异的长期防腐性能。In tropical coastal areas,high humidity and heat,high salt and high irradiation is an extremely harsh corrosive environment.Under such special conditions,the corrosion failure of metal materials has become a major bottleneck restricting the development and application of equipment,and the epoxy zinc-rich coatings commonly used in the current project in such harsh environments lack of in-depth study of the long-lasting protective performance.In this paper,through the cycle test of UV/condensation,neutral salt spray,and damp heat test,the long-term protection performance of epoxy zinc-rich coating supporting system on carbon steel in the corrosive environment of high humidity and heat,high salt and high irradiation is investigated,and the anticorrosive performance of the coating is investigated through the methods of adhesion,width of corrosion spreading at the coating scratches,surface microscopic morphology,and electrochemical impedance spectroscopy.The results show that:after 175 d cyclic accelerated corrosion test,the adhesion at different cycles of 36 d,70 d,100 d and 175 d,relative to the initial adhesion(10.45 MPa),the rate of decrease is 4.3%,10.0%,13.2%and 18.7%,respectively,although the adhesion has been reduced,but the decrease is not large.The corrosion spreading widths of the scratches at different cycles of 36 d,70 d,100 d and 175 d were 0.75 mm,1.25 mm,1.74 mm and 2.38 mm,respectively,which were all smaller than that of zinc-rich primer coatings,which was≤3 mm.SEM observations showed that the surface of the coatings produced obvious changes in four cycles of coating exposure,and a large number of block products were generated in the late stage of the test.EIS The results showed that the impedance value of the coating showed a gradual decrease from 2.93×10^(10)Ω·cm^(2)to 6.148×10^(9)Ω·cm^(2) during the process of(36~100)d,while there was a small increase in the radius size of the inductive arc from 100 d to 175 d,and the impedance spectrum did not show a second time constant,which can indicate

关 键 词：严酷腐蚀环境 碳钢 环氧富锌 循环加速试验 保护性能 

分 类 号：TG174.4[金属学及工艺—金属表面处理]