铝合金加速腐蚀因子模型与分析

Acceleration Corrosion Factor For Aluminum Alloys:Model and Analysis

以腐蚀深度衡量铝合金的腐蚀损伤,假设蚀坑深度服从对数正态分布、腐蚀深度与腐蚀时间的关系为幂函数式,建立了加速腐蚀因子模型,给出了常用铝合金加速腐蚀因子的表达式;得到了加速腐蚀因子与腐蚀时间无关的结论。并建立了加速腐蚀因子估计值的分布特性和统计分析方法。

The statistical analysis of acceleration corrosion factor for accelerated aging test to service or natural exposure environment on aluminum alloys is performed. The acceleration corrosion factor is the ratio of service time to accelerated time corresponding to the same corrosion depth. Assuming the corrosion depth follow the logarithmic normal distribution, and the relationship between the corrosion depth and the corrosion time can be expressed as a power function, the expression for acceleration corrosion factor are established. The acceleration corrosion factor is proved to be a constant regardless of reliability degree and corrosion time. The distribution of test acceleration corrosion factor is gained, and the confidence intervals of acceleration corrosion factor for LY12CZ aluminum alloys are obtained.