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在中性盐雾腐蚀环境中对Q235钢板进行0~178d的加速腐蚀试验,采用光学表面测量技术对锈蚀钢板表面进行数据采集,运用Geomagic studio逆向工程软件建立了Q235钢板锈蚀表面的几何模型;通过单轴拉伸试验研究了Q235钢板力学性能的退化规律。结果表明:随着锈蚀质量损失率增大,Q235钢板的屈服强度、抗拉强度和断后伸长率均呈明显的线性退化趋势,屈服平台迅速缩短,严重蚀坑的存在使得锈蚀钢板更易产生塑性损伤而进入颈缩阶段;通过对二次塑流模型进行修正,建立了锈蚀Q235钢板的应力-应变退化本构模型,得到了模型形状控制参数随锈蚀质量损失率变化的退化规律;在中性盐雾环境中,Q235钢板的腐蚀以点蚀为主,蚀坑分布不均匀,且具有较大的离散性和随机性,腐蚀过程中层状剥蚀产生的影响不可忽略。
Q235 steel plate was subjected to accelerated corrosion test for 0 ~ 178d in neutral salt spray corrosion environment. Optical surface measurement technology was used to collect the data of the corrosion steel plate surface. Geometrical model of Q235 steel corrosion surface was established by Geomagic studio reverse engineering software. The uniaxial tensile test studied the degradation of the mechanical properties of Q235 steel. The results show that the yield strength, tensile strength and elongation at break of Q235 steel show a significant linear trend of degeneration as the mass loss rate of corrosion increases. The yield platform is rapidly shortened. The presence of severe corrosion pits makes the corrosion of steel easier to produce plasticity The model of Q235 steel sheet was established by modifying the quadratic plastic flow model. The constitutive model of stress-strain degradation of Q235 steel sheet was established. The degradation of model shape parameters with the loss of corrosion rate was obtained. In salt fog environment, the corrosion of Q235 steel is mainly pitting corrosion, the distribution of corrosion pits is not uniform, and has large dispersion and randomness. The influence of layered erosion in the corrosion process can not be neglected.