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Oxidation and Hot Corrosion in Na₂SO₄–10%V₂O₅ of Ni–17Cr–6Al–0.5Y and Ni–16Cr–5.7Al–0.47Y–5Si MCrAly Alloys at 700°C

From National Research Council Canada

Alternative titleOxidation and Hot Corrosion in Na2SO4–10%V2O5 of Ni–17Cr–6Al–0.5Y and Ni–16Cr–5.7Al–0.47Y–5Si MCrAly Alloys at 700°C
DOIResolve DOI: https://doi.org/10.1179/cmq.1991.30.2.125
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Affiliation
  1. National Research Council of Canada
FormatText, Article
Abstract
A standard NiCrAlY alloy and a silicon enriched alloy were produced in order to study the effect of the addition of silicon on their oxidation and hot corrosion behaviour. The chemical compositions (wt%) of these alloys were Ni–17Cr–6Al–0.5Y and Ni–16Cr–5.7 Al–0.47Y–5Si. The oxide types formed at 700°C were studied and characterized. An outer layer of NiO developed on the surface of the standard alloy whereas a thin Al₂O₃ oxide scale occurred on the Si enriched alloy. To simulate the corrosive environment inside a diesel engine, hot corrosion testing was carried out at 700°C on specimens that were plasma-spray coated with a corrosive mixture of Na₂SO₄–10wt% V₂O₅. The development of a protective oxide barrier is considerably affected by the corrosive coating, particularly in the silicon enriched alloy.
Publication date
PublisherTaylor and Francis
In
  • Canadian Metallurgical Quarterly 30, no. 2: 125–130.
LanguageEnglish
Peer reviewedYes
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Record identifier2a5b7984-b47d-4b3f-accb-a0e46a597756
Record created2020-04-08
Record modified2020-05-08
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