第36卷第5期 北京科技大学学报 Vol.36 No.5 2014年5月 Journal of University of Science and Technology Beijing May 2014 外加应变对航空有机涂层损伤规律的影响 骆 晨四，蔡健平”，董春蕾》，刘明”，赵亮亮”，孙志华”，汤智慧”， 陆峰) 1)中航工业北京航空材料研究院金属腐蚀与防护研究室，北京1000952)中航工业沈阳飞机设计研究所结构部，沈阳110035 ☒通信作者，E-mail:chen.luo.23@googlemail.com 摘要借助有机涂层预应变施加方法，跟踪观察户内加速试验过程中受到外加应变的航空有机涂层表面形貌变化，利用环 境扫描电子显微镜进行显微组织表征，利用电化学阻抗谱进行特定频率的阻抗模值分析，进而综合研究航空有机涂层在外加 应变和热带海洋大气环境耦合作用下的损伤规律和失效模型.研究发现，外加拉应变导致有机涂层的防护性能下降，外加拉 应变水平越高，有机涂层损伤越严重，防护性能下降越多.进行户内加速试验过程中，受到外加拉应变的涂层防护性能进一步 下降，外加拉应变越大，下降越快.受外加拉应变的涂层防护性能下降的原因是相应的应力水平超过有机涂层材料的断裂强 度，从而在涂层内部形成微裂纹，构成外界溶液到达有机涂层/合金界面的通道.受到外加压应变后，有机涂层的防护性能不 发生明显变化.进行户内加速试验过程中，受到外加压应变的涂层防护性能缓慢丧失，受到外加压应变水平越高，涂层防护性 能下降越缓慢 关键词有机涂层：预应变：损伤：防护：电化学阻抗谱：微裂纹 分类号TG174.4 Effect of prestrain on the degradation behaviour of aviation organic coatings LUO Chen,CAl Jian-ping,DONG Chun-ei,LIU Ming,ZHAO Liang-liang,SUN Zhi-hua,TANG Zhi-hui,LU Feng 1)Metal Corrosion and Protection Laboratory,AVIC Beijing Institute of Aeronautical Materials,Beijing 100095,China 2)Structure Department,AVIC Shenyang Aircraft Design Research Institute,Shenyang 110035,China Corresponding author,E-mail:chen.luo.23@googlemail.com ABSTRACT The surface morphology of an aviation organic coating during indoor accelerated testing was continually observed by a prestrain method.Environmental scanning electron microscopy and electrochemical impedance spectroscopy were employed for micro- structural characterization and characteristic impedance modulus analysis to systematically study the degradation behavior and failure model of the organic coating under the co-effect of prestrain and tropical marine atmosphere.It is found that the protective properties of the organic coating show a dramatic decrease after tensile prestrain application and go further down during indoor accelerated testing: the degradation of the organic coating is positively correlated with the tensile prestrain level.It is thought that the loss of the protective properties is due to the relatively high stress level which exceeds the breaking strength of the organic coating materials,leading to the formation of microcracks,which serve as routes to the organic coating/alloy interface for solution.But the protective properties of the organic coating exhibit no change after compressive prestrain application and decrease slowly during indoor accelerated testing:the deg- radation of the organic coating is negatively correlated with the compressive prestrain level. KEY WORDS organic coatings:prestrain:degradation:protection:electrochemical impedance spectroscopy:microcracks 有机涂层是飞机蒙皮等航空结构上广泛采用 防护性能往往受到自然环境因素和力学因素的影 的防护手段.在实际服役过程中，航空有机涂层的 响.例如，在飞行或露天停放时不可避免地遭受太 收稿日期：20140107 基金项目：国家自然科学基金资助项目(51071144)：国防科技工业技术基础科研项目(H052011A001) DOI:10.13374/j.issn1001-053x.2014.05.014:http://journals.ustb.edu.cn第 36 卷 第 5 期 2014 年 5 月 北京科技大学学报 Journal of University of Science and Technology Beijing Vol． 36 No． 5 May 2014 外加应变对航空有机涂层损伤规律的影响 骆 晨1) ，蔡健平1) ，董春蕾2) ，刘 明1) ，赵亮亮1) ，孙志华1) ，汤智慧1) ， 陆 峰1) 1) 中航工业北京航空材料研究院金属腐蚀与防护研究室，北京 100095 2) 中航工业沈阳飞机设计研究所结构部，沈阳 110035  通信作者，E-mail: chen． luo． 23@ googlemail． com 摘 要 借助有机涂层预应变施加方法，跟踪观察户内加速试验过程中受到外加应变的航空有机涂层表面形貌变化，利用环 境扫描电子显微镜进行显微组织表征，利用电化学阻抗谱进行特定频率的阻抗模值分析，进而综合研究航空有机涂层在外加 应变和热带海洋大气环境耦合作用下的损伤规律和失效模型． 研究发现，外加拉应变导致有机涂层的防护性能下降，外加拉 应变水平越高，有机涂层损伤越严重，防护性能下降越多． 进行户内加速试验过程中，受到外加拉应变的涂层防护性能进一步 下降，外加拉应变越大，下降越快． 受外加拉应变的涂层防护性能下降的原因是相应的应力水平超过有机涂层材料的断裂强 度，从而在涂层内部形成微裂纹，构成外界溶液到达有机涂层/合金界面的通道． 受到外加压应变后，有机涂层的防护性能不 发生明显变化． 进行户内加速试验过程中，受到外加压应变的涂层防护性能缓慢丧失，受到外加压应变水平越高，涂层防护性 能下降越缓慢． 关键词 有机涂层; 预应变; 损伤; 防护; 电化学阻抗谱; 微裂纹 分类号 TG 174. 4 Effect of prestrain on the degradation behaviour of aviation organic coatings LUO Chen1)  ，CAI Jian-ping1) ，DONG Chun-lei2) ，LIU Ming1) ，ZHAO Liang-liang1) ，SUN Zhi-hua1) ，TANG Zhi-hui1) ，LU Feng1) 1) Metal Corrosion and Protection Laboratory，AVIC Beijing Institute of Aeronautical Materials，Beijing 100095，China 2) Structure Department，AVIC Shenyang Aircraft Design ＆ Ｒesearch Institute，Shenyang 110035，China  Corresponding author，E-mail: chen． luo． 23@ googlemail． com ABSTＲACT The surface morphology of an aviation organic coating during indoor accelerated testing was continually observed by a prestrain method． Environmental scanning electron microscopy and electrochemical impedance spectroscopy were employed for micro￾structural characterization and characteristic impedance modulus analysis to systematically study the degradation behavior and failure model of the organic coating under the co-effect of prestrain and tropical marine atmosphere． It is found that the protective properties of the organic coating show a dramatic decrease after tensile prestrain application and go further down during indoor accelerated testing; the degradation of the organic coating is positively correlated with the tensile prestrain level． It is thought that the loss of the protective properties is due to the relatively high stress level which exceeds the breaking strength of the organic coating materials，leading to the formation of microcracks，which serve as routes to the organic coating /alloy interface for solution． But the protective properties of the organic coating exhibit no change after compressive prestrain application and decrease slowly during indoor accelerated testing; the deg￾radation of the organic coating is negatively correlated with the compressive prestrain level． KEY WOＲDS organic coatings; prestrain; degradation; protection; electrochemical impedance spectroscopy; microcracks 收稿日期: 2014--01--07 基金项目: 国家自然科学基金资助项目( 51071144) ; 国防科技工业技术基础科研项目( H052011A001) DOI: 10． 13374 /j． issn1001--053x． 2014． 05． 014; http: / /journals． ustb． edu． cn 有机涂层是飞机蒙皮等航空结构上广泛采用 的防护手段． 在实际服役过程中，航空有机涂层的 防护性能往往受到自然环境因素和力学因素的影 响． 例如，在飞行或露天停放时不可避免地遭受太