高速列车用聚氨酯面漆耐蚀性能和老化机制研究  

Corrosion Resistance and Aging Mechanism of Polyurethane Topcoat for High-speed Train

作　　者：李春霖 史洪微 梁国平[3,4] 李丽 王浩 王伟 刘福春 韩恩厚[3] LI Chunlin;SHI Hongwei;LIANG Guoping;LI Li;WANG Hao;WANG Wei;LIU Fuchun;HAN En-Hou(CRRC Qingdao Sifang Co.,Ltd.,Qingdao 266111,China;School of Materials Science and Engineering,Shenyang University of Technology,Shenyang 110870,China;Key Laboratory of Nuclear Materials and Safety Assessment,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;Key Laboratory for Anisotropy and Texture of Materials Ministry of Education,School of Materials Science and Engineering,Northeastern University,Shenyang 110819,China)

机构地区：[1]中车青岛四方机车车辆股份有限公司,青岛266111 [2]沈阳工业大学材料科学与工程学院,沈阳110870 [3]中国科学院金属研究所中国科学院核用材料与安全评价重点实验室,沈阳110016 [4]东北大学材料科学与工程学院材料各向异性与织构教育部重点实验室,沈阳110819

出　　处：《中国腐蚀与防护学报》2023年第6期1383-1391,共9页Journal of Chinese Society For Corrosion and Protection

基　　金：国家自然科学基金(52171089)。

摘　　要：利用电化学阻抗谱(EIS)、紫外老化、扫描电镜(SEM)和红外光谱(FTIR)等方法研究了铝合金板表面涂覆的聚氨酯面漆的耐蚀性能和老化机制。结果表明,在3.5wt.%NaCl溶液中浸泡240 h后,聚氨酯面漆发生了后固化现象。在浸泡384~1560 h期间,聚氨酯面漆/铝合金体系界面发生微腐蚀。在浸泡1920~2160 h期间,铝合金基材表面产生了腐蚀产物膜。聚氨酯面漆在紫外老化实验中,表面逐渐产生孔洞变得疏松并发生剥落、光泽度逐渐下降、失光率增加以及色差先增加后趋于稳定,老化前期以可见光降解为主,老化后期以紫外光降解为主。The corrosion resistance and aging mechanism of polyurethane topcoat on Al-alloy plates used for high-speed train were studied by electrochemical impedance spectroscopy(EIS),ultraviolet ag-ing,scanning electron microscopy(SEM)and Fourier transform infrared spectroscopy(FTIR).The results showed that the polyurethane topcoat presented post-curing phenomenon after immersing in 3.5wt.%NaCl solution for 240 h.The topcoat/Al-alloy interface was slightly corroded within the period of 384-1560 h,and the corrosion product film was formed on the surface of Al-alloy substrate within 1920-2160 h.During the ultraviolet(UV)aging test,holes gradually emerged on the surface of polyurethane topcoat,which then became loose and spalling,meanwhile its glossiness gradually decreased with increasing reduction of glossiness,as well as its color difference increased and then tended to be stable.It follows that the visi-ble light degradation was the main degradation in the early stage of aging,and UV degradation was the main degradation in the late stage of aging.

关 键 词：聚氨酯面漆 铝合金 电化学阻抗谱 紫外老化 Fourier变换红外光谱 

分 类 号：TG172[金属学及工艺—金属表面处理]