Corrosion in Supercritical Systems Due to H2S and CO2

Committee TEG 121X is hosting a symposium on the effects of H2S on welded API 5L X65 steel used with supercritical CO2. The virtual event takes place Friday, April 30, 8–8:25 a.m. Central.  

The symposium is hosted by the TEG 121X committee, “Supercritical and Other High-Temperature/High-Pressure Liquid Environments: Corrosion of Materials.” Led by Shiladitya Paul, the title of the symposium is, “Effect of H2S on the Corrosion and Cracking Behavior of Welded API 5L X65 Steel in Supercritical CO2.”  

The scope of the committee is “to identify processes and process environments in which high-temperature, high-pressure liquid solutions are present and cause corrosion. To encourage communication of typical corrosion problems and solutions through symposia and informal information exchange sessions.”  

In this symposium, the presenters will discuss the use and outcome of the stress corrosion cracking (SCC) test. According to the symposium summary: welded API X65 steel specimens were prepared and tested in de-aerated NaCl solution (1000mg/L) for 30 days purged with both 10MPa CO2 as well as a mixture of 10MPa CO2 and 0.1MPa H2S. Corrosion and SCC tests were conducted at 40 °C with one set of specimens submerged in the solution and the other suspended above it. SCC tests were conducted using a four-point method by applying 90% of 0.2% proof stress. After completion of exposure, the specimens’ mass increased and microstructural characterization revealed that the specimens formed a scale. The presence of 0.1 MPa H2S reduces the calculated corrosion rate of carbon steel parent due to preferential formation of sparingly soluble mackinawite. Some fine-scale features were seen only on the tensile surface of the stressed steel specimens. These fine-scale features were deeper (length and cross-section) in specimens tested in the vapor phase.

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