Complete inhibition of localized corrosion in 5Cr steel under a water-saturated supercritical CO environment through Al microalloying.

To address the critical corrosion challenges faced by metal pipelines in carbon capture, utilization, and storage (CCUS) technologies, the study prepared a series of novel Fe-5Cr-(0-3)Al alloy steels. The corrosion resistance of these alloys in a water-saturated supercritical CO (sc-CO) environment was systematically investigated. The results revealed that increasing Al content significantly reduced the corrosion rate.