Corrosion Behavior and Product Evolution of Steel for High-Speed Railway Bogie G390NH in Simulated Marine and Industrial Atmospheric Environment
Atmospheric corrosion is ubiquitous in transportation,infrastructure,and other areas,and it always reduces the service life of materials.Bogie,an important component of the high-speed railway,performs bearing,guiding,damping,traction,and braking.The safe operation of the high-speed railway is inextricably linked to its service performance.However,for the high-speed railway bogie,its service envi-ronment constantly changes as per the operation of the train and being in various atmospheric environ-ments,such as the ocean,pollution,damp-heat,and severe cold for a long time.Therefore,special atten-tion must be paid to the effect of atmospheric corrosion on its service life.The use of weathering steel in bogie has effectively balanced the cost and service life.With the advancement of science and social growth,previous materials are no longer capable of meeting the current service life requirements.G390NH is provided for investigation as a newly designed weathering steel for the bogie.In this study,the corrosion behavior and the product layer evolution law of high-speed rail bogie steel G390NH in simu-lated marine and industrial atmospheric environments are investigated using periodic wetting tests com-bined with corrosion kinetics,conventional electrochemistry,microscopic morphology,and corrosion prod-uct composition analysis.It demonstrates that the two ions(Cl-and SO32-)have different corrosion mecha-nisms on the material.In simulated marine atmosphere environment,Cl-has a higher penetrating capaci-ty,and the rust layer consists of unsteady Fe3O4 and γ-FeOOH;furthermore,coupled with the effect of al-ternating dry and wet,corrosion always maintains a high rate and the rust layer does not give a very ef-fective protection function.However,in the acidic SO32-environment,although the corrosion is accelerat-ed,a layer of corrosion-resistant Cu is enriched in the inner rust layer and simultaneously,and a large amount of α-FeOOH is promoted,which greatly enhances the corrosion resistance of the rust layer.
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