Can Thermally Sprayed Aluminium (TSA) Mitigate Corrosion of Carbon Steel in Carbon Capture and Storage (CCS) Environments?

Thermally sprayed aluminum (TSA) coatings have been successfully used to mitigate corrosion of carbon steel in offshore service, but concerns regarding its suitability in CO₂-containing solutions have kept it out of the running for emerging carbon capture and storage applications. This paper presents the results of a 30-day test in which carbon steel specimens protected by TSA coatings were immersed in deionized water at ambient temperature in 0.1 MPa CO₂. Acidity and corrosion potential were monitored during the test and dissolved Al³⁺ ion content was analyzed at the completion. Based on experimental results, thermally sprayed aluminum is a viable candidate for corrosion mitigation in CO₂-containing water as would be encountered in carbon capture and storage applications.