摘要
为研究航空铝合金材料在机场环境中的腐蚀坑形状特征,选取航空LD2铝合金为研究对象,开展了该材料试件在模拟机场环境中的加速腐蚀试验。选定腐蚀坑长度、宽度和深度三个形状参数,依据分形理论对不同当量腐蚀年限下腐蚀坑形状的分形规律进行分析。结果表明,腐蚀初期,腐蚀坑形状参数的分形维数迅速增大,变化率较大;腐蚀中后期,腐蚀坑深度参数分形维数趋于平稳,而长度和宽度参数的分形维数由于蚀坑融合则发生衰减。依据分形分析结果,铝合金腐蚀中后期的腐蚀坑形状可等效为半球体或半椭球体。
LD2 aluminum alloy was choosen as research object in order to analyze the configuration character of aero aluminum alloy corrosion pit in airport environment, and accelerated corrosion test in simulated airport environment was carried out to obtain the corrosion pit configuration parameters, then the fractal dimension of corrosion pit configuration parameters in different equivalent corrosion years was analyzed through fractal theory. The results indicate that the fractal dimension of corrosion pit configuration parameters increased rapidly in initial corrosion stage, so the variance ratio of {ractal dimension was relatively great. In the middle and later corrosion stages, the fractal dimension of corrosion depth trended to be stable, to the contrary, the fractal dimensions of corrosion length and width decreased because of the corrosion pit mergence, and during this corrosion period, the corrosion pit configuration of aluminum alloy could be equivalent to half sphere or half spheroid.
出处
《腐蚀与防护》
CAS
北大核心
2014年第2期128-132,共5页
Corrosion & Protection
基金
国家自然科学基金(11272173)
关键词
铝合金
加速腐蚀
蚀坑形状
分形维数
aluminum alloy
accelerated corrosion
corrosion pit configuration
fractal dimension
