有机涂层在模拟沙漠大气环境下的加速试验研究-表面技术.PDFVIP

摇 摇 摇 表面技术 第43卷摇 第4期 ·64 · SURFACE TECHNOLOGY 摇 2014年08月 試試試試試試試試試試試試試試試試試試試試試試試試試試試試試試試試試試試試試試試試試試試試試試試試試 有机涂层在模拟沙漠大气环境下的加速试验研究 刘金和,张雅琴,刘慕懿,胡喜艳,雍兴跃 (北京化工大学 有机无机复合材料国家重点实验室,北京 100029) 摘摇 要: 目的摇 在较短的时间内获得有机涂层在沙漠大气环境下的腐蚀失效规律。 方法摇 针对有机涂 层中应用比较广泛的丙烯酸聚氨酯涂层,采用紫外暴晒与吹沙试验相结合的加速试验环境谱进行实验室 模拟沙漠大气环境加速老化试验,通过分析涂层质量、厚度、光泽度、表面形貌及电化学阻抗的变化,研究 有机涂层的老化失效过程。 结果摇 随着加速试验周期的延长,丙烯酸聚氨酯涂层发生了一系列变化,表 现为涂层质量减小,厚度减薄,光泽度降低,表面微观缺陷增多,电化学低频阻抗模值减小,防护性能下 降。 结论摇 通过加速试验,可以快速获得有机涂层在沙漠大气环境下的老化失效规律。 关键词:有机涂层;加速试验;沙漠大气环境;防护性能 中图分类号:TG174.4;TG172.3摇 摇 文献标识码:A摇 摇 文章编号:1001鄄3660(2014)04鄄0064鄄04 Study on Accelerated Test of Organic Coating in Desert Atmospheric Environment LIUJin鄄he,ZHANG Ya鄄qin,LIUMu鄄yi,HUXi鄄yan,YONGXing鄄yue (State Key Laboratory of Organic鄄Inorganic Composites,Beijing University of Chemical Technology,Beijing 100029,China) ABSTRACT:ObjectiveTo get thelaw of failureof theorganic coating inthe desert atmospheric environment in arelatively short periodoftime. MethodsAcrylicpolyurethanecoatingwhichiswidelyusedinorganiccoatingswasselectedinthetest,theacceler鄄 ated aging test of the organic coating in desert atmospheric environment was carried out using the method of UV exposure and blo鄄 wing sands test in thelaboratory,andtheagingprocessoftheorganiccoatingwascharacterizedby changesincoatingmass,thick鄄 ness,gloss,thesurfacemorphology andtheelectrochemicalimpedance. ResultsItturnedoutthattheorganiccoatingbegantode鄄 gradewith the decrease of mass,gloss,thickness and impedance but the increase of micro defects which implied the decrease of coating protectivepropertieswithtime. ConclusionThelaw of degradationoftheorganiccoatingindesertatmosphericenvironment could be quickly obtained by accelerated test. KEY WORDS:organ