Abstract: Through morphological observation, corrosion kinetics analysis, rust layer composition analysis, and electrochemical testing, a comparative study was conducted on the corrosion behavior of weathering steels S350 and B550 and carbon steel Q235 in simulated general atmospheric and marine atmospheric environments. The results indicate that in the simulated general atmospheric environment, both weathering steels exhibited better resistance than carbon steel. In the later stages of the test, the corrosion rates of the two weathering steels were approximately half that of carbon steel. However, in the simulated marine atmospheric environment, the corrosion rates of both weathering steels were higher than that of carbon steel Q235, indicating that neither was suitable for use without coating in chloride-rich marine environments.