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High-temperature corrosion performance of HVAF-sprayed NiCr, NiAl, and NiCrAlY coatings with alkali sulfate/chloride exposed to ambient air
Tarbiat Modares University, Department of Material Science and Engineering, Tehran, 14 115, Iran.
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. (PTW)ORCID iD: 0000-0002-7663-9631
2019 (English)In: Corrosion Science, ISSN 0010-938X, E-ISSN 1879-0496, Vol. 160, article id 108066Article in journal (Refereed) Published
Abstract [en]

The high-temperature corrosion of high velocity air-fuel (HVAF) thermal spray Ni21Cr, Ni5Al, and Ni21Cr7AlY coatings was investigated at 600 °C for 168 h in ambient air under KCl and 50-50 mol% KCl–K2SO4 salts. Chlorination-oxidation cycle and breakdown of the corrosion products layer were the dominant corrosion mechanism in the chromia-forming Ni21Cr and Ni21Cr7AlY coatings exposed to KCl. KCl–K2SO4 was less corrosive to the chromia-forming coatings as K2SO4 was less reactive to the protective Cr-rich oxide. The alumina-forming NiAl exhibited a better corrosion performance under KCl, though it partially suffered from selective sulfidation when exposed to the mixed salt. © 2019 Elsevier Ltd

Place, publisher, year, edition, pages
2019. Vol. 160, article id 108066
Keywords [en]
Air; Alumina; Aluminum alloys; Aluminum oxide; Binary alloys; Chlorine compounds; Chromium compounds; Corrosion protection; High temperature corrosion; Nickel coatings; Potash; Sprayed coatings; Sulfur compounds, A. KCl-K2SO4B; Alkali sulfates; Corrosion mechanisms; Corrosion performance; Corrosion products; High velocity air fuels; Nickel-based coatings; NiCrAlY coating, Aluminum corrosion
National Category
Manufacturing, Surface and Joining Technology
Research subject
ENGINEERING, Manufacturing and materials engineering
Identifiers
URN: urn:nbn:se:hv:diva-14490DOI: 10.1016/j.corsci.2019.06.021Scopus ID: 2-s2.0-85071852542OAI: oai:DiVA.org:hv-14490DiVA, id: diva2:1356860
Funder
Knowledge Foundation, RUN 20160201Region Västra GötalandAvailable from: 2019-10-02 Created: 2019-10-02 Last updated: 2020-01-10Bibliographically approved

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Sadeghi, Esmaeil

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