基于数量关系研究铝合金船体点蚀对拉伸性能的影响

目的通过点蚀与拉伸性能的数量关系,为5083铝合金船体不同腐蚀状态板材相应修换要求的提出提供数据支持。方法对服役10 a的某型艇船体5083铝合金板,进行点蚀特征参数统计,并测试其拉伸性能。对四个点蚀参数与拉伸强度损失的关系进行拟合回归分析及相关性分析,找出相应的数量关系。结果由拟合回归分析可知,最大点蚀深度数据样本与拟合曲线较契合,与拉伸性能的相关度最高。另外得出了点蚀参数与拉伸强度损失之间的函数关系,可以估计相应的指标。由相关性分析可知,最大点蚀深度与拉伸强度的相关系数大于0.9,属于强相关。自变量中,最大点蚀深度和平均点蚀深度这两个指标出现一定程度的冗余。结论点蚀特征及拉伸性能数量关系的研究可以为铝合金船体板的拉伸性能进行相关预测,并可为铝合金船体板的耐蚀寿命研究提供依据。

Study on the Effect of Pitting Corrosion of Aluminum Alloy Hull on Tensile Properties Based on Quantitative Relationship

The quantitative relationship between pitting corrosion and tensile properties can be used to provide data support for the proposal of the corresponding repair and replacement requirements for the 5083 aluminum alloy hull plates in different corrosion conditions. For a certain type of boat hull 5083 aluminum alloy plate that has been in service for ten years, the pitting corrosion characteristic parameter statistics and the tensile performance test are carried out, and the fitting regression analysis and correlation analysis of the four parameters of pitting corrosion and the loss of tensile strength are carried out to find the corresponding quantitative relationship.According to the fitting regression analysis, the maximum pitting depth is most correlated with the tensile property. In addition, the function relation between pitting parameters and tensile strength loss is obtained, and the corresponding indexes can be estimated. According to the correlation analysis, the correlation coefficient between the maximum pitting depth and tensile strength is greater than 0.9, which is a strong correlation. In the independent variables, there is a certain degree of redundancy in the two indicators of pitting depth.The study based on the pitting corrosion characteristics and the quantitative relationship of tensile properties can be used to predict the tensile properties of aluminum alloy hull plates and provide a basis for the replacement and repair of hull plates.