Corrosion Behavior of Steels in Supercritical CO2 for Power Cycle Applications

• Main Authors: Repukaiti, Richard, Teeter, Lucas, Ziomek-Moroz, Margaret, Doğan, Ömer, Tucker, Julie
• Format: Conference Proceeding
• Language: English
• ISSN: 1938-5862; 1938-6737
• DOI: 10.1149/07711.0799ecst

In order to understand issues with corrosion of heat exchanger materials in direct supercritical carbon dioxide (sCO2) power cycles, a series of autoclave exposure experiments and electrochemical experiments have been conducted. Corrosion behaviors of 347H stainless steel and P91 martensitic-ferrtic steel in sCO2 environment have been compared. In autoclave exposure tests performed at 50°C- 245°C and 80 bar. Mass change measurements, surface characterization, and corrosion product analysis have been conducted to understand the corrosion behavior of steels in sCO2 containing H2O and O2. Electrochemical tests performed at room temperature and 50°C, a simulation environment of water condensation phase with dissolved CO2 was prepared to evaluate the corrosion resistance of materials. From both types of experiments, generally 347H showed higher corrosion resistance than P91.