航空材料学报2017，Vol.37Issue(4)：25-32,8.DOI:10.11868/j.issn.1005-5053.2016.000229
LC4铝合金服役环境下点蚀形貌特征及其演变规律
Pitting Corrosion Topography Characteristics and Evolution Laws ofLC4 Aluminum Alloy in Service Environment
摘要
Abstract
Aircraft aluminum alloy is easy to initiate pitting corrosion in the service environment, the pitting corrosion topography characteristics could directly affect the fatigue mechanical property of structure material.In order to obtain the pitting corrosion topography characteristics of LC4 aluminum alloy in the service environment, the accelerated corrosion test was carried out along the accelerated corrosion test environment spectrum which imitated the service environment spectrum, and the corrosion topography characteristic parameters of corrosion pit depth H,corrosion pit surface length L and corrosion pit surface width W were defined respectively.During the corrosion test process ,the three parameters of typical corrosion pit were successively measured in different equivalent corrosion years for obtaining the corrosion pit damage size data, then the data were analysed through the statistics method and fractal theory.Further more in order to gain the pit topography characteristics in the same equivalent corrosion year and the topography evolution laws during different equivalent corrosion years were gained.The analysis results indicate that LC4 aluminum alloy corrosion pit topography characteristics in the service environment include the following: firstly, the pit topography characteristic parameters conform to the lognormal distributions in the same equivalent corrosion years;secondly,the pit topography characteristic parameters gradually reflect the fractal feature in accordance with the equivalent corrosion year increment, and the pits tend to be shallow, long and moderate wide topography character.关键词
铝合金/点蚀/形貌特征/统计分析/分形理论Key words
aluminum alloys/pitting corrosion/topography characteristics/statistical analysis/fractal theory分类
矿业与冶金引用本文复制引用
刘治国,李旭东,穆志韬..LC4铝合金服役环境下点蚀形貌特征及其演变规律[J].航空材料学报,2017,37(4):25-32,8.基金项目
国防科学技术基金(9140A25011007JB45) （9140A25011007JB45）
