基于M IV的碳钢大气腐蚀速率 影响因子权重分析

通过平均影响值（MIV）影响因子权重分析算法，以碳钢Q235、Ste355、St12和Q450腐蚀速率的暴露时间、气候因素和环境因素数据为依据，以|MIV|值为评价依据，定量分析15种影响因子（暴露时间、平均温度、平均相对湿度、日照时数、降水量、平均风速、海盐粒子浓度、SO₂、HCl、NO₂、H₂S、硫酸盐化速率、NH₃、降尘量-非水溶性、降尘量-水溶性）对碳钢腐蚀速率影响的权重大小。结果表明：当MIV调节率从5%逐步递增至25%时，同种影响因子对腐蚀速率的影响权重变化不大，但4种碳钢对各影响因子的敏感度略有不同；气候因素对腐蚀速率影响最大，其次为暴露时间，环境因素中SO₂和降尘量对腐蚀速率影响较大；平均相对湿度、日照时数、平均温度是影响腐蚀速率最主要的3个因子。

Impact factor weight analysis of atmospheric corrosion rate of carbon steel based on MIV

Based on the mean impact value (MIV) which is an impact factor weight analysis method, the weights of fifteen impact factors on corrosion rate of four types of carbon steels (Q235, Ste355, St12, and Q450) were evaluated. The impact factors were corrosion duration, temperature, humidity, sunshine hours, precipitation, wind speed, sea salt ion concentration, SO₂, HCl, NO₂, H₂S, sulfation rate, NH₃, water soluble dust fall, and non-water soluble dust fall. These fifteen factors cover three important categories: corrosion duration, climatic factor, and environmental factor. The results show that when the regulation rate of MIV increases from 5% to 25% gradually, for different carbon steels, the weights of impact factors were similar, while the degrees of sensitivity were a little different; in the three categories, the climatic factor is of the largest impact on corrosion rate, followed by corrosion duration. The weights of SO₂ and dust fall are larger among the environmental factors. The most important three factors influencing the corrosion rate are mean relative humidity, sunshine hours, and mean temperature.