【摘要】 根据理论假设和计算得出LY12CZ在3%NaCl水溶液中点蚀深度D_σ与外加应力σ及腐蚀时间t间符合等式D_σ=A×C₀exp（bσ）tⁿ=A′tⁿ,表明在腐蚀时间相同的情况下,点蚀深度与外加应力之间应符合Dσ=D₀exp（bσ）的指数函数规律;外加应力相同的条件下点蚀扩展速率与腐蚀时间符合D_σ=A′tⁿ的幂函数的规律。不同外加应力下的腐蚀浸泡实验证明,LY12CZ的点蚀深度D_σ扩展确实符合D_σ∝exp（bσ）tⁿ的规律。实验结果证明,铝合金的点蚀数据在有应力的条件下与无应力条件下具有相同的腐蚀深度-时间的幂函数规律,只是随应力大小的不同系数值有不同的变化,A值与外加应力间符合推导的A′=Aexp（bσ）指数函数规律。所以通过对A值进行修正可以将无应力下的自然腐蚀环境下的腐蚀数据推广到有外加应力的条件下使用。更多还原

【Abstract】 The relationship between the pitting depth（D_σ） of LY12CZ in 3%NaCl aqueous solution and applied stress（σ） and corrosion time（t） was calculated,and the results showed that the correlation was accorded with the formula D_σ= A×C₀exp（bσ）tⁿ = A′tⁿ,the formula indicated that the relationship between pitting depth and applied stress was accorded with exponential function D_σ= D₀exp（bσ） under the same corrosion time and power function D_σ= A′tⁿ under the same applied stress.Experiment results under various applied stress prove that correctness of the formula above,the experimental results showed that pitting data of LY12CZ accords with the same power function D_σ= A′tⁿ no matter what applied stress existed or not,the influence of applied stress was showed in the coefficient of A,the relationship between A′（coefficient A under stress） andσwas A′= A×exp（bσ）.so the pitting data of aluminum alloys in natural environment could be extended to the natural environment corrosion under applied stress through amendment to the coefficient A.更多还原