Proposed Metal Dusting Mechanism in Lower Temperature,High Steam Syn Gas

摘要

Aggressive metal dusting attack of nickel-based alloys was encountered in high water vapor containing syn gas environments in the 1000-1110oF (538-566oC) range while iron-based alloys suffered little damage. Metallurgical and energy dispersive x-ray spectroscopy analyses of sectioned specimens found the iron-based alloys formed protective chromium rich oxide films while the nickel-based alloys did not. Nickel based alloys suffered both iron and chromium depletion from the surface layers as well as accelerated attack. A mechanism for these observations is discussed.