Acceleration corrosion factor for aluminum alloys: Model and analysis

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.