Internal Corrosion of Co₂ Pipelines for Carbon Capture and Storage Available to Purchase

Capturing and storage of anthropogenic CO₂ requires the transport of CO₂ with varying combinations of impurities depending on the capture technology and source. Traditional gas pipelines are not designed for the transport of such relatively low purity CO₂, in fact, initial research indicates that a low-purity CO₂ environment poses a significant durability risk to conventional (gas) pipelines. In a supercritical CO₂ stream, the presence of water will lead to acidic conditions via the formation of carbonic acid. In this work a round robin of experiments has been conducted in aqueous solutions where CO₂ has been added to water to form carbonic acid in-situ, along with testing in sulfuric acid that was found to simulate the impact of carbonic acid upon steel. The role of Cl-, NO₃- and SO4^2- impurities was also investigated. We see that there is merit in such high throughput tests to form an initial understanding which can be subsequently benchmarked by supercritical CO₂ tests.