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采用光学表面测量技术对实验室加速腐蚀钢板试件进行坑蚀表面数据采集,通过建立不同龄期的锈蚀钢板表面形貌图讨论了锈蚀钢板表面点蚀特征随腐蚀时间的变化趋势。对于以局部腐蚀为主的锈蚀钢板,通过计算证明坑蚀平均深度近似等于腐蚀平均深度,且其随时间的变化趋势可以采用新型weibull函数加以描述。经过对垂直于钢板受力方向的坑蚀截面损失率进行探究,指出可以利用正态分布模型表征其随机分布规律,并建立了模型参数与坑蚀平均深度之间关系式。最后讨论了与腐蚀时间相关的钢板屈服强度退化概率模型。
Optical surface measurement technique was used to collect pits surface data of accelerated corrosion specimens in laboratory. The surface pitting corrosion characteristics of corrosion-resistant steel specimens were discussed with the change of corrosion time. For corroded steel plates with local corrosion, the average depth of pits is approximately equal to the average depth of corrosion, and the trend with time can be described by a new type of weibull function. After studying the loss rate of pits section perpendicular to the direction of steel plate stress, it is pointed out that the normal distribution model can be used to characterize the random distribution of pit corrosion rate and establish the relationship between the model parameters and the average pit depth. Finally, the probabilistic model of steel yield strength degeneration is discussed in terms of corrosion time.