Q235钢的污染海洋大气环境腐蚀寿命预测模型

Corrosion Prediction Model of Q235 Steel in Polluted Marine Atmospheric Environment

采用周浸加速实验模拟Q235钢在我国青岛、万宁两种污染海洋大气环境的腐蚀行为,用失重法、X射线衍射(XRD)、扫描电子显微镜(SEM)等方法分析Q235钢在室内模拟大气环境的腐蚀形貌、腐蚀产物、腐蚀动力学。研究室内加速实验与室外暴晒实验的相关性。结果表明:周浸加速实验后Q235钢与实际污染海洋大气环境暴晒实验结果相关性较好。结合灰色关联法建立Q235钢在两种污染海洋大气环境下的腐蚀寿命预测模型:T_(QD)=137.002t^(1.093),T_(WN)=102.398t^(0.952)。

The corrosion behaviour of Q235 steel in Qingdao and Wanning of China,the two kinds of polluted marine environment were simulated by cyclic immersion test,and the correlation of indoor cyclic immersion test and outdoor marine atmospheric corrosion test of Q235 steel were studied.The corrosion morphologies,corrosion products,corrosion kinetics of Q235 steel were investigated with methods of scanning electron microscopy(SEM),X-ray diffraction(XRD)and mass loss.The results reveal that the corrosion morphologies and compositions of corrosion products after cyclic immersion test agree with those after the real atmospheric test.Corrosion prediction model of Q235 steel in two kinds of marine atmospheric environment was built combined with Grey correlation method:T_(QD)=137.002t^(1.093),T_(WN)=102.398t^(0.952).