北京科技大学学报Issue(5)：656-668,13.DOI:10.13374/j.issn1001-053x.2014.05.014
外加应变对航空有机涂层损伤规律的影响
Effect of prestrain on the degradation behaviour of aviation organic coatings
摘要
Abstract
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.关键词
有机涂层/预应变/损伤/防护/电化学阻抗谱/微裂纹Key words
organic coatings/prestrain/degradation/protection/electrochemical impedance spectroscopy/microcracks分类
矿业与冶金引用本文复制引用
骆晨,蔡健平,董春蕾,刘明,赵亮亮,孙志华,汤智慧,陆峰..外加应变对航空有机涂层损伤规律的影响[J].北京科技大学学报,2014,(5):656-668,13.基金项目
国家自然科学基金资助项目(51071144) （51071144）
国防科技工业技术基础科研项目(H052011A001) （H052011A001）
