Carbon capture, utilization, and storage (CCUS) can not only reduce carbon dioxide (CO2) emissions by permanent geological storage but can also enhance oil and gas recovery. However, if anthropogenic CO2 captured from coal-fired power plants is applied as the displacement gas, acidic gas impurities (SOx, NOx, and hydrogen sulfide [H2S]) in power plant-produced CO2 could eventually corrode materials in CCUS systems, including steels, polymers, cements, and even rocks. When steels corrode under a high-pressure, high-temperature multiphase environment containing supercritical CO2, various gas impurities, salts, crude oil, and solid particles merit further investigation.