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KCI-induced corrosion behavior of HVAF-sprayed Ni-based coatings in ambient air
Tarbiat Modares University, Department of Material Science and Engineering, Tehran, 14115, Iran.
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. (PTW)ORCID iD: 0000-0002-7663-9631
Tarbiat Modares University, Department of Material Science and Engineering, Tehran, 14115, Iran.
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. (PTW)ORCID iD: 0000-0002-9578-4076
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2017 (English)In: Proceedings of the International Thermal Spray Conference & Exposition (ITSC 2017), Curran Associates, Inc. , 2017, Vol. 2, p. 946-950Conference paper, Published paper (Refereed)
Abstract [en]

It is well known that the presence of KCl deposited on superheater tubes in biomass- and waste-fired boilers leads to a severe corrosion and premature damage. In order to protect such critical components which are routinely exposed to aggressive environments, thermal spray coatings are frequently proposed as a potential solution. By virtue of the techno-commercial benefits that provides as a direct outcome of its ability to cost-effectively deposit coatings virtually free of porosity and in situ formed oxides, the high velocity air-fuel (HVAF) process offers a particularly attractive approach. In the present work, the influence of KCl on the oxidation behavior of four HVAF-sprayed Ni-based coatings (Ni21Cr, Ni5AI, Ni21Cr7AI1Y, and Ni21Cr9Mo) has been investigated. The coatings were deposited onto specimens of 16Mo3 steel, a widely used boiler tube material. High temperature corrosion tests were carried out in ambient air at 600°C, with 0.1 mg/cm2 KCl being sprayed onto the samples prior to the exposure. Uncoated substrates and an identical test environment without KCl were used as reference. SEM/EDS and XRD techniques were utilized to characterize the as-sprayed and exposed samples. The results showed that the small addition of KCl significantly accelerated damage to the coatings. It was further revealed that the alumina-forming NiAl coating was capable of forming a more protective oxide scale compared to other chromia and mixed-oxide scale forming coatings. In general, the oxidation resistance of the coatings based on the kinetic studies had the following ranking (from the best to the worst): NiAl >NiCr> NiCrAlY> NiCrMo. © Copyright 2017 by DVS Media GmbH. All rights reserved.

Place, publisher, year, edition, pages
Curran Associates, Inc. , 2017. Vol. 2, p. 946-950
Keywords [en]
Air, Alumina, Aluminum alloys, Aluminum oxide, Binary alloys, Boiler corrosion, Boilers, Chlorine compounds, Chromium alloys, Corrosion protection, Corrosive effects, Inorganic coatings, Molybdenum alloys, Oxidation resistance, Potassium compounds, Scale (deposits), Sprayed coatings, Superheater tubes, Ternary alloys, Yttrium alloys, Aggressive environment, Biomass boiler, Corrosion behavior, Critical component, High velocity air fuels, Oxidation behaviors, Thermal spray coatings, Waste-fired boilers, Corrosion resistant coatings
National Category
Manufacturing, Surface and Joining Technology
Research subject
ENGINEERING, Manufacturing and materials engineering; Production Technology
Identifiers
URN: urn:nbn:se:hv:diva-13054Scopus ID: 2-s2.0-85047450145ISBN: 9781510858220 (print)OAI: oai:DiVA.org:hv-13054DiVA, id: diva2:1259074
Conference
International Thermal Spray Conference and Exposition, ITSC 2017, Dusseldorf, Germany, 7- 9 June 2017
Available from: 2018-10-26 Created: 2018-10-26 Last updated: 2019-01-10Bibliographically approved

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Sadeghimeresht, EsmaeilMarkocsan, NicolaieJoshi, Shrikant V.

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