CORROSION BEHAVIOR OF NI-BASED ALLOYS IN COAL SYNTHETIC GAS ATMOSPHERE

摘要

The product of coal gasification is syngas, a mixture of hydrogen and carbon monoxide, in which the selected materials may operate. Understanding alloys performance in CO-rich atmospheres is important toward the development of coal gasification systems. This paper describes the corrosion behavior of Alloy 242 and Alloy 230 after exposure to a CO-rich atmosphere at 750°C. Chemical composition of the gaseous environment was determined by gas chromatography (GC). The surfaces of the corroded samples were investigated by scanning electron microscopy (SEM) equipped with microchemical analytical capabilities. X-ray diffraction (XRD) analysis was also used in this research.