Affordable Access

Publisher Website

The high temperature sulfidation behavior of Nb-Al-Si coatings sputter-deposited on a stainless steel

Authors
Journal
Corrosion Science
0010-938X
Publisher
Elsevier
Publication Date
Volume
38
Issue
11
Identifiers
DOI: 10.1016/s0010-938x(96)00095-9
Keywords
  • A. Stainless Steel
  • A. Sputtered Films
  • B. Sem
  • C. Amorphous Structures
  • C. Sulfidation

Abstract

Abstract The sulfidation behavior of amorphous 58at.%Nb-38at.%Al-4at.%Si and 59at.%Nb-35at.%Al-6 at.%Si coatings sputter-deposited on a stainless steel substrate of SUS 304 has been studied at 1 kPa sulfur vapor pressure over the temperature range of 973–1173 K. The scales formed on the coating were bilayered, primarily consisting of an outer non-protective layer of A1 2S 3 and an inner barrier layer of NbS 2. Beneath the coating the formation of (Fe, Cr, Ni) depleted, Al enriched zone was observed, which resulted from the mutual diffusion between the coating and the substrate. The coating improved effectively the sulfidation resistance of the stainless steel, although elements in the substrate diffused outwards in the coating and small amounts of their ions were contained in the sulfide scales. The high sulfidation resistance of the coated specimens seems attributable to the formation of a protective NbS 2 scale, instead of less protective FeNb 2S 4, even in the presence of iron, incorporated by outward diffusion from the substrate, in the coating.

There are no comments yet on this publication. Be the first to share your thoughts.