Test Environment Control for Reliable Corrosion Testing in Dense Phase CO2

Abstract A study was undertaken to assess the experimental variables controlling establishment of the test environment in dense phase CO2 containing O2 and H2O as the primary impurities. Identifying the key variables and developing a consistent methodology to achieve the target environmental chemistry in a short time period is essential to ensure reliable measurements of the corrosion rate of exposed test specimens. The rate of pressurisation, agitation of the test environment and the presence of a physical shield to prevent water splashing on the specimens all significantly influenced the time required for impurities to completely dissolve and uniformly distribute in the test environment. A recommended procedure for reliable control of such test environments is proposed.