• CN: 11-2187/TH
  • ISSN: 0577-6686

Journal of Mechanical Engineering ›› 2024, Vol. 60 ›› Issue (19): 132-143.doi: 10.3901/JME.2024.19.132

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Corrosion and Wear Behavior of U71Mn Rail in Industrial and Marine Atmosphere

LI Mengxuan1, DING Haohao1,2, AN Boyang3, WANG Wenjian1,2, LIN Qiang2, CHEN Rong3, LIU Qiyue2   

  1. 1. Tangshan Institute, Southwest Jiaotong University, Tangshan 063000;
    2. State Key Laboratory of Rail Transit Vehicle System, Southwest Jiaotong University, Chengdu 610031;
    3. School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031
  • Received:2023-09-02 Revised:2024-06-10 Online:2024-10-05 Published:2024-11-27

Abstract: Industrial and marine atmospheric environments could lead to the atmospheric corrosion of rail, which will accelerate its service performance deterioration and failure process.In order to study the influence of industrial and marine atmospheric environments on the corrosion and wear behaviors of U71Mn rail, the electrochemical behavior of rail in different concentrations of NaHSO3 and NaCl solution is analyzed using the orthogonal test method through the electrochemical workstation.The corrosion and wear behaviors of rail under four normal loads in NaHSO3 and NaCl solution are analyzed by electrochemical reciprocating friction and wear testing machine.The results show that the corrosion rate of rail is positively correlated with the concentration of NaHSO3 solution, and increases first and then decreases with the increase of NaCl solution concentration.When the concentration of NaCl solution is higher than 0.311 mol/L, the accumulation of corrosion products enhances the isolation between rail and air, so the corrosion behavior of rail is reduced.The corrosion rate and wear depth of the rail increase with the increase of normal load in NaHSO3 solution.The mechanical properties of the corrosion will be damaged which promotes the wear, and the wear will damage the rail passivation film which intensifies the corrosion.In NaCl solution, the corrosion rate and wear depth of the rail decrease and then increase with the increase of normal load.Under the low load condition, the protective effects of rust layer and passivation film reduce the loss of rail substrate material.Under the large load, the passivation film damage promotes the corrosion wear.The influence of rust layer on rail corrosion can be investigated by studying rail corrosion behavior in atmospheric environment, and the study of rail corrosion and wear behavior can provide theoretical guidance for rail life prediction in service.

Key words: rail, electrochemistry, atmospheric environment, normal load, corrosion wear

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