CORROSION PERFORMANCE OF METALLIC MATERIALS IN CARBON OXIDE - CONTAINING ATMOSPHERE FOR SOLID OXIDE FUEL APPLICATIONS

摘要

Carbon monoxide-containing syngas obtained from coal gasification is being considered as a fuel for solid oxide fuel cells (SOFCs). Carbon monoxide in the fuel could cause serious performance problems of metallic materials used as interconnects in SOFCs operating below 800°C. Cr{sub}2O{sub}3 scale-forming ferritic alloys are the most promising candidates for SOFC interconnect applications. Due to the potential detrimental effect of CO on ferritic steel stability, it is necessary to determine the corrosion performance of metallic interconnect candidates in CO-rich atmospheres at SOFC operating temperatures. This paper describes the corrosion behavior of a ferritic steel containing 22 wt% Cr (Fe-22Cr) in CO-rich atmosphere at 750°C. Surface characterization, such as scanning electron microscopy, optical profilometry, and X-ray diffraction analysis were used in this study.