摘要
目的研究高强度铝合金材料腐蚀损伤分布的动力学规律。方法通过统计高强度铝合金材料的蚀坑深度和直径,采用双参数威布尔分布进行拟合,提出以双参数威布尔分布中的两个参数α、β作为高强度铝合金材料腐蚀损伤分布的表征量,建立α、β随腐蚀时间增长的多种数学模型。结果α随腐蚀时间的增长而减小,β随腐蚀时间的增长而增大,并且分布参数均能很好地符合一阶指数函数模型。结论与实际蚀坑分布增长物理现象比较,α、β的变化趋势能够揭示出蚀坑分布随时间增长的变化过程,并且腐蚀损伤分布动力学规律能很好地符合一阶指数函数模型。
Objective To study the distribution kinetics of corrosion damage in high strength aluminum alloy. Methods By calculating the corrosion pit depth and diameter of high-strength aluminum alloy materials and fitting the two-parameter Weibull distribution, two parameters α and β in the two-parameter Weibull distribution were proposed as the characterization quantities of the corrosion damage distribution of high-strength aluminum alloy materials, and a variety of mathematical models of α and βwith the increase of corrosion time were established. Results α decreased with the increase of corrosion time, while β increased with the increase of corrosion time, and the distribution parameters can well conform to the first-order exponential function model. Conclusion Compared with the physical phenomenon of actual pit distribution growth, the change trend of α and β can reveal the change process of pit distribution growth with time, and the dynamic law of corrosion damage distribution can well conform to the first-order exponential function model.
引文
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