Abstract
Currently, high-speed trains work under various atmospheric environments, and the bogie as a key component suffers serious corrosion. To investigate the corrosion behavior of bogies in industrial atmospheric environments, the periodic immersion wet/dry cyclic corrosion test for SMA490BW steel and automatic metal active gas (MAG) welded joints used for bogies was conducted in the present work. Corrosion weight loss rate, structure, and composition of rust layers as well as electrochemistry parameters were investigated. The results showed that the corrosion weight loss rate decreased with increasing corrosion time; furthermore, the corrosion weight loss rate of the welded joints was lower than that of SMA490BW steel. The XRD results showed that the rust layers formed on SMA490BW steel and its welded joints were mainly composed of α-FeOOH, γ-FeOOH, Fe2O3, and Fe3O4. The observation of surface morphology indicated that the rust layers of the welded joints were much denser and had a much finer microstructure compared with those of SMA490BW steel. After corrosion for 150 h, the corrosion potential of the welded joints with rust layers was higher than that of SMA490BW steel. In short, the welded joints exhibited better corrosion resistance than SMA490BW steel because of the higher content of alloy elements, as shown in this work.
Highlights
The bogie, as one of the key components of high-speed trains, operates with the functions of load bearing, guidance, and propulsion, and its performance affects the running quality and security of high-speed trains directly [1,2]
The corrosion behavior of SMA490BW steel and its welded joints used for high-speed train bogies was investigated using the periodic immersion wet/dry cyclic corrosion test to simulate an industrial atmospheric environment
The corrosion weight loss rate of SMA490BW steel and its welded joints decreases with increasing corrosion time and becomes stable because the rust layers after 150 h have a good effect on protecting the substrate
Summary
The bogie, as one of the key components of high-speed trains, operates with the functions of load bearing, guidance, and propulsion, and its performance affects the running quality and security of high-speed trains directly [1,2]. High-speed trains work under various atmospheric environments, and the bogie’s surface suffers different degrees of corrosion. A corrosion status survey of high-speed trains in commission showed that the bogie was affected by serious corrosion, and that the corrosion reaction would continue in a corrosive environment [3,4,5]. The bogie’s bearing strength is reduced due to the corrosion of the bogie, especially of its welded joints. This can lead to a decrease in the bogie’s fatigue life. The study of the corrosion behavior of a bogie and its welded joints has the greatest significance for the safe reliability of high-speed trains
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