Abstract
The initial stages of metal dusting corrosion and carbon formation were studied under syngas at industrially relevant conditions. A set of Inconel 601 alloy coupons were preoxidized in 10% steam in N2 at 540 °C for 6 h, followed by exposure to carburizing (ac >1) syngas mixtures. The exposure was performed at 550, 650, or 750 °C at 20 bar for 20 h under a CO/H2/CO2/H2O/Ar mixture of composition 20/25/15/10/30 or 50/25/15/10/0 (%). The resulting surfaces and carbonaceous products were then characterized by means of optical imaging and light optical microscopy, scanning electron microscopy (SEM), depth profile analysis by Auger electron spectroscopy under ion-sputtering and transmission electron microscopy/energy dispersive spectroscopy (TEM/EDS). Little or no carbon formed at 550 °C, and the alloy matrix remained reasonably intact, with some smaller changes occurring within the Cr rich oxide layer covering the underlying metallic bulk. The higher carbon formation occurring under the exposure at 650 and 750...
Published Version
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