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Hot corrosion of MCrAlY coatings in sulphate and SO2 environment at 900°C: Is SO2 necessarily bad?
Linköping University.
Linköping University.
Siemens Industrial Turbomachinery AB.
RISE, Swerea, Swerea KIMAB.
Show others and affiliations
2015 (English)In: Surface & Coatings Technology, ISSN 0257-8972, E-ISSN 1879-3347, Vol. 261, 41-53 p.Article in journal (Refereed)
Abstract [en]

MCrAlY coatings can be corroded due to the basic fluxing (type-I hot corrosion) of the supposed-to-be protective alumina scale in a molten sulphate environment. In this study, two MCrAlY coatings, coating A (10wt.% Al, 20wt.% Cr) and coating B (7wt.% Al, 28wt.% Cr), were tested in 48-hour cycles at 900°C in a sodium-potassium sulphate environment with and without SO2 (500ppm). The aim was to study the effect of SO2 at the typical type-I-hot-corrosion temperature-900°C. The results showed that the corrosion behavior of the MCrAlY coatings depended not only on the coating composition but also on the corrosion environment. It was found that in coating A alumina scale was more resistant in the sulphate-plus-SO2 condition than that in the sulphate-only condition. Such phenomenon indicated a beneficial effect of SO2. On Coating B, however, mixed oxide layers, consisting of alumina and other oxides and sulfides, formed after a certain number of cycles in the sulphate environments with or without SO2 gas. In this coating, the addition of SO2 in the sulphate environment promoted the formation of non-dense chromia oxides which may form from oxidation of Cr-sulfides. © 2014 Elsevier B.V.

Place, publisher, year, edition, pages
2015. Vol. 261, 41-53 p.
Keyword [en]
Alumina, Basic fluxing, Hot corrosion, MCrAlY, SO2
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:ri:diva-12774DOI: 10.1016/j.surfcoat.2014.11.065Scopus ID: 2-s2.0-84920865705OAI: oai:DiVA.org:ri-12774DiVA: diva2:972967
Available from: 2016-09-22 Created: 2016-09-22Bibliographically approved

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CiteExportLink to record
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