基于数据分析的大气腐蚀等级细化研究

Refinement Research of Atmospheric Corrosion Categories Based on Data Analysis

目的提出一种基于数据分析的方法对大气腐蚀等级进行细化。方法以碳钢为例,采用有序样本聚类方法,对国内大气腐蚀试验站多年积累的腐蚀速率进行分析,将大气腐蚀等级细化为10级。在此基础上,根据腐蚀速率以及相应大气环境中的二氧化硫浓度、氯离子浓度、润湿时间的数据,采用反距离加权插值法,并结合ISO 9223—2012标准获取等级细化后的碳钢大气腐蚀性等级估计表。结果经过细化之后的大气腐蚀等级10级分级结果为0~8μm/a（C1）,8~25μm/a（C2）,25~40μm/a（C3）,40~50μm/a（C4）,50~60μm/a（C5）,60~75μm/a（C6）,75~90μm/a（C7）,90~100μm/a（C8）,100~200μm/a（C9）,200~700μm/a（C10）。结论该10级分级法将大气腐蚀等级划分得更为细化。

Objective To propose a new method based on data analysis to refine the atmospheric corrosion categories. Methods The method of ordered sample clustering was used in this paper to analyze the data of carbon steel corrosion rate accumulated in atmospheric corrosion test stations in China during the past years. As a result, the atmospheric corrosion degree of carbon steel was divided into 10 categories. On this basis, the inverse distance weighted interpolation method combined with ISO 9223--2012 standard was used to obtain the estimation table of atmospheric corrosivity categories according to the concentration of sulfur dioxide, concentration of chlorine ion, time of wetness data and the corrosion rate data of carbon steel in the corresponding atmospheric environment. Results The result of refined 10 categoried was 0-8 IX m/a（C1）, 8-25 Iμ m/a（C2）, 25-40 μm/a（C3）, 40-50 μ m/a（C4）, 50-60 μ m/a（CS）, 60- 75 μm/a（C6）, 75-90 μ m/a（C7）, 90-100 μ m/a（C8）, 100-200 μ m/a（C9）, and 200-700 μ m/a（C10）. Conclusion This 10-category method is more refined in describing atmospheric corrosion.