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Oxidation behaviour of HVAF-sprayed NiCr coating in moisture-laden environment
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. (PTW)ORCID iD: 0000-0002-7663-9631
Chalmers University of Technology, Department of Environmental Inorganic Chemistry, Gothenburg, 412 96, Sweden.
Chalmers University of Technology, Department of Environmental Inorganic Chemistry, Gothenburg, 412 96, Sweden.
Chalmers University of Technology, Department of Environmental Inorganic Chemistry, Gothenburg, 412 96, Sweden.
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2017 (English)In: Proceedings of the International Thermal Spray Conference & Exposition (ITSC 2017), New York: Curran Associates, Inc. , 2017, Vol. 2, p. 644-646Conference paper, Published paper (Refereed)
Abstract [en]

Reducing CO2 emissions from power generation plants is intimately related to enhancing their thermal efficiency, which can be achieved by increasing the temperature/pressure of steam. However, any increase in steam temperature is inevitably accompanied by accelerated oxidation of boiler components. The use of renewable fuels such as biomass increases the problem by introducing a number of corrosive compounds into the boiler environment, resulting in more rapid degradation of components. Although thermal sprayed coatings are techno-commercially attractive solutions for augmenting the durability of degradation-prone boiler components and are already used, further improvements in their performance are continuously sought. High-velocity air fuel (HVAF) coatings are promising in this context. In the present work, isothermal oxidation behavior of a candidate HVAF-sprayed Ni21Cr was studied in N2 + 5% O2 + 20% H2O at 600°C for 168h. The oxide scale growth mechanisms were studied by BIB/SEM/EDX to evaluate the effectiveness of the coatings. It was found that the water vapor effect is insignificant due to the Cr reservoir in the Ni21Cr coating, which yielded enhanced oxidation protection by forming nano-scale Cr2O3

Place, publisher, year, edition, pages
New York: Curran Associates, Inc. , 2017. Vol. 2, p. 644-646
Keywords [en]
Air, Binary alloys, Boiler corrosion, Boilers, Nanotechnology, Oxidation, Reservoirs (water), Scale (deposits), Accelerated oxidations, Attractive solutions, High velocity air fuels, Isothermal oxidations, Oxidation protection, Power generation plants, Reducing co2 emissions, Thermal sprayed coating, Sprayed coatings
National Category
Manufacturing, Surface and Joining Technology
Research subject
ENGINEERING, Manufacturing and materials engineering; Production Technology
Identifiers
URN: urn:nbn:se:hv:diva-13053Scopus ID: 2-s2.0-85047445276ISBN: 9781510858220 (print)OAI: oai:DiVA.org:hv-13053DiVA, id: diva2:1259255
Conference
International Thermal Spray Conference and Exposition, ITSC 2017, Dusseldorf, Germany, 7-9 June, 2017
Available from: 2018-10-29 Created: 2018-10-29 Last updated: 2019-01-10Bibliographically approved

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Sadeghimeresht, EsmaeilMarkocsan, NicolaieJoshi, Shrikant V.

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