不同暴露时间下不锈钢在典型地区大气腐蚀的灰色分析

采用灰色关联分析方法对2Cr13和1Cr18Ni9Ti不锈钢在典型地区12a大气腐蚀和环境因素之间的关联度进行了计算,研究了大气腐蚀影响因素随时间的变化.结果表明,2Cr13和1Cr18Ni9Ti不锈钢大气腐蚀影响因素随时间的变化有所不同.2Cr13不锈钢的初期腐蚀,受相对湿度大于80%的年时数、降雨量、温度和Cl-的影响较大,受SO2影响较小.2Cr13不锈钢的中长期腐蚀,主要受Cl-、SO2、相对湿度大于80%的年时数、平均相对湿度及温度等影响.在各个腐蚀阶段腐蚀速率和各种影响因素的关联度大小次序均在不断变化.1Cr18Ni9Ti不锈钢在发生腐蚀的初期,主要受相对湿度大于80%的年时数、降雨量及降尘等因素影响.随着腐蚀时间的延长,Cl-的作用逐渐上升为主导因素,关联度大小次序趋于稳定.

Grey relational analysis of atmospheric corrosion of stainless steels in terms of exposure time in representative areas

Based on grey relational analysis,the relation changes between the environmental factors and corrosion rate of 2Cr13 and 1Cr18Ni9Ti were examined.It was shown that the changes of influencing factors of 2Cr13 and 1Cr18Ni9Ti varied due to exposure time.The atmosphere corrosion rate of 2Cr13 was affected mainly by the time when the relative humidity was greater than 80% in a year,rainfall,temperature and Cl-in the initial stage,while later affected by Cl-,SO2,the time when the relative humidity was greater than 80% in a year,relative humidity,and temperature.The relation sequence between the environmental factors and corrosion rate of 2Cr13 was changing ceaselessly in different periods of time.The corrosion rate of 1Cr18Ni9Ti was affected by the time when the relative humidity was greater than 80% in a year,rainfall,dust and so on in initial stage.The effect of Cl-was boosted up with corrosion time.Cl-became the leading factor of 1Cr18Ni9Ti gradually.The relation sequence stabilized between the environmental factors and corrosion rate of 1Cr18Ni9Ti after long-term exposure.