Abstract
The influence of CO2 on the corrosion characteristics of 42CrMo steel through heat treatment was systematically investigated. The results revealed that 42CrMo steel had a widmanstatten structure before heat treatment, and the Fe3C in the steel was laminar. However, it exhibited a granular bainite structure after heat treatment, and the Fe3C was granular. The corrosion rate of 42CrMo steel increased after heat treatment. The corrosion film of 42CrMo steel after heat treatment occurred severe spallation, and the protective properties of corrosion film were reduced. The lamellar Fe3C inhibited the local flow of Fe2+ and had a better anchoring effect on corrosion products, resulting in the formation of a compact Cr-rich corrosion film. The granular Fe3C promoted the spallation of corrosion products, resulting in the formation of a porous corrosion film with no Cr-enrichment. Therefore, the heat treatment reduced the CO2 corrosion resistance of 42CrMo steel.
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