Abstract
The addition of reactive elements (REs) is knownto increase the adherence of Al2O3scales and the underlying alloys. A widely acceptedmechanism is that the REs getter the sulfur impurity inthe alloy, thus preventing it from segregating to thescale-alloy interface to weaken the interfacial bonding.This paper provides evidence showing that not all S-freeinterfaces are strong. Although eliminating the sulfur in the alloy can greatly improve scaleadhesion, the presence of RE clearly has additionalbeneficial effects that make the scale-alloy interfaceeven stronger. Fe3Al-base alloys, with orwithout Zr additions or a desulfurizationH2-anneal were oxidized at 1000°C inO2. The amount of sulfur at theAl2O3-alloy interface was studiedafter the scales were removed by scratching with adiamond stylus in ultra-high vacuum using Augerspectroscopy. The interface composition was related tothe spallation resistance of the scale.
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