A study on the corrosion resistance of t-shaped bolts in modular equipment cabins of multiple units under different repair processes

Abstract The corrosion of T-bolts in the modular equipment compartment of the high-speed train unit caused by its environmental impact greatly affects operational safety and reduces transportation efficiency. In order to restore safe operating speed and improve transportation efficiency, it is necessary to conduct disease-cause analysis and treatment. This article analyzes and explains the corrosion of the T-bolts in the modular equipment compartment of the high-speed train unit, and adopts the zinc infiltration method and Dacromet method as repair processes. Salt spray corrosion experiments, thermal shock corrosion experiments, and electrochemical experiments are conducted on the original parts, zinc infiltrated parts, and Dacromet parts to simulate the actual application conditions of T-bolts. The results indicate that the corrosion of T-bolts is caused by alkaline environments and is divided into two types: T-bolt head corrosion and T-bolt thread corrosion. The Dacromet process treatment of T-shaped bolts improves their corrosion resistance, thereby achieving the reuse of T-shaped bolts.