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High-Temperature Corrosion of HVAF-Sprayed Ni-Based Coatings for Boiler Applications
Chalmers University of Technology, Energy and Materials, Department of Chemistry and Chemical Engineering, Göteborg, 412 96, Sweden.
Chalmers University of Technology, Energy and Materials, Department of Chemistry and Chemical Engineering, Göteborg, 412 96, Sweden.
Högskolan Väst, Institutionen för ingenjörsvetenskap, Avdelningen för avverkande och additativa tillverkningsprocesser (AAT).ORCID-id: 0000-0002-7663-9631
Högskolan Väst, Institutionen för ingenjörsvetenskap, Forskningsmiljön produktionsteknik(PTW). (PTW)ORCID-id: 0000-0001-5521-6894
Vise andre og tillknytning
2019 (engelsk)Inngår i: Oxidation of Metals, ISSN 0030-770X, E-ISSN 1573-4889, Vol. 91, nr 5-6, s. 729-747Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The present study investigates the initial corrosion behaviour of HVAF-sprayed NiCr, NiAl and NiCrAlY coatings in two different environments, O 2 + H 2 O and O 2 + H 2 O + KCl at 600 °C for up to 168 h in order to evaluate the possibility of utilizing such coatings in biomass- and waste-fired boilers. SEM/EDX analysis showed that all coatings displayed a protective behaviour in O 2 + H 2 O. Upon addition of KCl (O 2 + H 2 O + KCl), the corrosion behaviour of the NiCr coating drastically changed as it formed a thick oxide layer and displayed major chlorine diffusion down to the substrate. The NiCrAlY coating displayed a significantly better corrosion resistance with only minor oxide formation. The NiAl coating exhibited a protective behaviour similar to when exposed in the absence of KCl indicating that a thin protective oxide has formed on the coating surface. The performance of the NiAl and NiCrAlY coatings is promising for future studies with long-term exposures in more corrosive environments such as in a biomass- and waste-fired boiler. © 2019, The Author(s).

sted, utgiver, år, opplag, sider
2019. Vol. 91, nr 5-6, s. 729-747
Emneord [en]
Aluminum alloys; Aluminum corrosion; Binary alloys; Biomass; Boiler corrosion; Boilers; Chlorine compounds; Chromium alloys; Corrosion resistance; Corrosion resistant coatings; Corrosive effects; Diffusion coatings; High temperature applications; High temperature corrosion; Sprayed coatings; Wastes, Corrosion behaviour; Corrosive environment; HVAF; Long term exposure; Ni-based coatings; NiCrAlY coating; Protective oxides; Waste-fired boilers, Potassium compounds
HSV kategori
Forskningsprogram
TEKNIK, Produktions- och materialteknik
Identifikatorer
URN: urn:nbn:se:hv:diva-13758DOI: 10.1007/s11085-019-09906-0ISI: 000467574600011Scopus ID: 2-s2.0-85062942037OAI: oai:DiVA.org:hv-13758DiVA, id: diva2:1316391
Forskningsfinansiär
Knowledge Foundation, RUN 2016-0201Region Västra Götaland, RUN 2016-01489Tilgjengelig fra: 2019-05-17 Laget: 2019-05-17 Sist oppdatert: 2019-06-05

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