Corrosion of Steels in CCS Processes

Abstract

The main cause of the global warming is considered to be the increase in CO₂ emission due to the developed economic activity of mankind. Nowadays, strict reduction of CO₂ emission to the atmosphere is required to keep the rise in temperature less than 2.0℃ after the industrial revolution. One potential technology is CCS （Carbon dioxide Capture and Storage） consisting of four processes, ①Separation and recovery of CO₂ from raw gases, ②Transportation of dense phase CO₂ to an injection site, ③Injection of super critical CO₂ into deep subsurface reservoirs, and ④Confirmation of the safe storage of the injected CO₂. However, CO₂ is an acid gas and it becomes highly corrosive when it exists with liquid water, contaminants, and the variation of temperature and pressure. The corrosive conditions of the four processes are technically reviewed in relation to the corrosion behavior of steels.