Evaluation of Corrosion Resistance of Materials for Supercritical Carbon Dioxide Power Plant

Abstract

The Supercritical Carbon Dioxide Brayton Cycle has drawn much attention due to its high efficiency and stability in the power plants. Evaluation of the corrosion behavior and mechanical properties as an essential part of the power plant is of great importance for structural integrity assessment. In this work, the three types of possible candidate materials were chosen to examine high-temperature thermal stability and corrosion resistance under the high-temperature carbon dioxide environment: i) ferritic-martensitic steels (T92), ii) austenitic steels (304L & 316L), and iii) Ni-based alloys (Alloy 600 and 738LC). The experiments were performed during 1000 hours at temperatures ranging from 500 to 800°C. The corrosion behaviors of the tested materials were evaluated from weight change, composition and thickness of oxide scale, and analyses of surface and cross-section morphologies. The results show that Ni-based alloys and austenitic steels have better corrosion resistance than ferritic-martensitic steels at the temperatures tested. The corrosion resistances of the tested materials were compared with those from other publications.