光老化丙烯酸聚氨酯涂层防护性能的电化学表征
Electrochemical Evaluation of UV Aged Acrylic Polyurethane Varnish Coatings
摘 要
采用荧光紫外辐照UVB＋冷凝的人工加速试验对丙烯酸聚氨酯清漆进行老化试验,用电化学阻抗谱(EIS)评价不同暴露时间涂层的屏障性.结果表明:随着暴露时间增加,一定频率下的低频阻抗模值｜Z｜下降,表现为时间的变化函数:傅立叶变换红外光谱(FTIR)分析表明,紫外暴露下发生高分子断链涂层降解,而在老化12天后｜Z｜值的升高可能与分子的重构变化有关:因而,EIS谱的｜Z｜值可作为一种较为有效的表征参数来反映UV老化后有机涂层的防护性能.
人工加速试验
光老化
EIS
低频阻抗模值
acrylic polyurethane varnish coating
artificial weathering test
UV photo-degradation
EIS
low frequency impedance
Abstract
An artificial weathering test(UVB radiation/condensation) was used for aging testing of acrylic polyurethane varnish coatings.The barrier protection properties of coatings with different exposure times were evaluated using electrochemical impedance spectroscopy(EIS).The results showed that low frequency impedance｜Z｜at a fixed frequency decreased with the increase of exposure time which and yielded time series function. Fourier transform infrared spectroscopy(FTIR) indicated that degradation had taken place upon exposure to artificial weathering test,and also appearsed to undergo some molecular segments re-association after 12 days exposure which led to the increase of low frequency impedance.Therefore,low frequency impedance could be used as an appropriate parameter to characterize the protective properties of intact organic coatings.
中图分类号 TG174.4
所属栏目 试验研究
基金项目 国家自然科学基金面上项目(50571013);国家科技基础条件平台建设项目(2005DKA10400)
收稿日期 2008/4/14
修改稿日期 2008/5/6
网络出版日期
作者单位点击查看
引用该论文: HU Jian-wen,LI Xiao-gang,Gao Jin. Electrochemical Evaluation of UV Aged Acrylic Polyurethane Varnish Coatings[J]. Corrosion & Protection, 2009, 30(4): 211～214
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参考文献
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【4】Fedrizzi L,Bergo A,Fanicchia M.Evaluation of accelerated aging procedures of painted galvanised steels by EIS [J].Electrochimica Acta,2006,51(8/9):1864-1872.
【5】张鉴清,曹楚南.电化学阻抗方法研究评价有机涂层[J].腐蚀与防护,1998,19(3):99-104.
【6】Skerry B S,Simpson C H.Accelerated test method for assessing corrosion and weathering of paints for atmospheric corrosion control[J].Corrosion,1993,49(8):663-674.
【7】Park J H,Lee G D,Ooshige H,et al.Monitoring of water uptake in organic coatings under cyclic wet-dry condition[J].Corrosion Science,2003,45(8):1881-1894.
【8】Deflorian F,Fedrizzi L,Bonora P L.Influence of the photo-oxidative degradation on the water barrier and corrosion protection properties of polyester paints[J].Corrosion Science,1996,38(10):1697-1708.
【9】徐永祥,严川伟,丁杰,等.紫外光对涂层的老化作用[J].中国腐蚀与防护学报,2004,24(3):168-173.
【10】杨丽霞,张三平,林安,等.有机涂层渗水率及金属界面腐蚀的研究进展[J].材料保护,2001,34(10):88-90.
【11】Bierwagen G P,Tallman D,Li J P,et al.EIS studies of coated metals in accelerated exposure[J].Progress in Organic Coatings,2003,46(2):148-157.
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