返回届次CSCP-ICC-2024-075

Analysis of corrosion causes of weathering resistant steel for railway freight car body

作者

Du Wei

单位

Institute of Metals and Chemistry、China Academy of Railway Sciences Group Corporation、Beijing 100081、China

关键词

railway freight carscorrosionresidual liquidelectrochemical corrosion Railway freight is the main mode of transportationand the safety and reliability of operation are particularly important. Due to the large difference in climatic conditionsespecially in the southern region affected by the Mar ine climate (high temperaturehigh salthigh humidity)coupled with the harsh working conditions of trucksthe steel structure of the car body not only bears the impact of friction and corrosion of goods in the full temperature environmentbut also bears the impact of bumping and unloading machinerythe protective coating inside the car body will be damaged in a short time. Resulting in rapid internal corrosion of the truck body. Conclusion (1) The corrosion of truck body materials is mainly electrochemical corrosionand the corrosion of door materials is more obvious than that of other parts. The corrosion products are mainly Fe oxides and hydroxidesand finally generate stable γ -FeOOH. There are cracks on the surface of the corrosion products of t he vehicle bodywhich reduces the binding force and strength of the corrosion products and weakens the protective effect of the corrosion products on the matrix. (2) The presence of Si and Ca in the rust layer is brought by atmospheric dustand S and Cl are introduced by rain or dust suppressor. There are many cracks on the surface of the rust layerand the corrosion products have weak protective effect on the matrix. (3) The door foam sealant has tight pore arrangementhigh water absorptionand relatively high concentration of corrosive ions inside the void. Cl - and SO 42-will aggravate the electrochemical corrosion process of metal materials in the car body in a humid environment. (4) The main reasons affecting the corrosion of car body materials: h igh-frequency impact of goodscorrosive ions in a humid environment.

收录来源

International Corrosion Congress · 第22届国际腐蚀大会

摘要

This paper mainly studies the corrosion problem of weathering steel materials used in railway freight car bodies. Using optical microscopy, scanning electron microscopy (SEM), energy spectrum and X -ray diffraction, among other techniques, the corrosion characteristics of weathering steel materials used in railway freight car bodies are analyzed. At the same time, ion chromatography technology is used to study the residual liquids and foam solutions within the car body. The results show that both the residual liquids and the foam solutions contain high concentrations of Cl-and SO42-, which are the main factors causing corrosion of the railway freight car body. Additionally, the door frame area of the car body is subject to prolonged moisture, which accelerates the electrochemical corrosion of the weathering steel material used in the door frame, resulting in more severe corrosion of the door frame compared to other parts of the car body.

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