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- Jafari, R.Tarbiat Modares University, Department of Material Science and Engineering, Tehran, 14115, Iran (author)
KCI-induced corrosion behavior of HVAF-sprayed Ni-based coatings in ambient air
- Article/chapterEnglish2017
Publisher, publication year, extent ...
- Curran Associates, Inc.2017
- printrdacarrier
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- LIBRIS-ID:oai:DiVA.org:hv-13054
- https://urn.kb.se/resolve?urn=urn:nbn:se:hv:diva-13054URI
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- Language:English
- Summary in:English
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- 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.
Subject headings and genre
- TEKNIK OCH TEKNOLOGIER Materialteknik Bearbetnings-, yt- och fogningsteknik hsv//swe
- ENGINEERING AND TECHNOLOGY Materials Engineering Manufacturing, Surface and Joining Technology hsv//eng
- 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
- Manufacturing and materials engineering
- Produktions- och materialteknik
- Production Technology
- Produktionsteknik
Added entries (persons, corporate bodies, meetings, titles ...)
- Sadeghimeresht, Esmaeil,1985-Högskolan Väst,Avdelningen för avverkande och additativa tillverkningsprocesser (AAT),PTW(Swepub:hv)esasad (author)
- Shahrabi Farahani, T.Tarbiat Modares University, Department of Material Science and Engineering, Tehran, 14115, Iran (author)
- Markocsan, Nicolaie,1967-Högskolan Väst,Avdelningen för avverkande och additativa tillverkningsprocesser (AAT),PTW(Swepub:hv)tnm (author)
- Joshi, Shrikant V.,1960-Högskolan Väst,Forskningsmiljön produktionsteknik(PTW),PTW(Swepub:hv)shrjos (author)
- Tarbiat Modares University, Department of Material Science and Engineering, Tehran, 14115, IranAvdelningen för avverkande och additativa tillverkningsprocesser (AAT) (creator_code:org_t)
Related titles
- In:Proceedings of the International Thermal Spray Conference & Exposition (ITSC 2017): Curran Associates, Inc., s. 946-9509781510858220
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