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Isothermal oxidation behavior of HVAF-sprayed Ni and NiCr coatings in H2-H2O environment
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. (PTW)ORCID iD: 0000-0002-7663-9631
University West, Department of Engineering Science, Division of Production Engineering. University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. (PTW)ORCID iD: 0000-0002-9578-4076
University West, Department of Engineering Science, Research Enviroment Production Technology West. University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. (PTW)ORCID iD: 0000-0001-5521-6894
2017 (English)In: Surface & Coatings Technology, ISSN 0257-8972, E-ISSN 1879-3347, Vol. 317, 17-25 p.Article in journal (Refereed) Published
Abstract [en]

The formation of a protective chromia scale on stainless steels is known to be suppressed by the presence of water vapor in reducing conditions. Thermal spray coatings present a promising approach to improve the durability of steels by transferring the first line of oxidation attack from the bulk steel to the coating. In the present work, isothermal oxidation behavior of Ni and NiCr coatings deposited by High-Velocity Air Fuel (HVAF) process on 304L stainless steel was investigated at 600 degrees C for 168 h. Ar-10%H-2-20%H2O was selected as the oxidation environment to study the oxidation behavior of the coatings in a low pO(2) environment containing H2 and H2O. BIB/ SEM, EDS, and XRD techniques were used to characterize the as-sprayed coatings and to investigate the oxidation mechanisms in the coated samples. Results showed that both Ni and NiCr coatings imparted oxidation protection to the 304L substrate. The chromia-forming 304L steel presented a duplex but non-protective oxide scale comprising of an outer Fe3O4 layer on an inner (Fe, Cr)(3)O-4-spinel oxide. In contrast, the NiCr coating presented superior oxidation behavior due to the formation of a continuous, thin, and slow-growing Cr2O3 scale. The Ni coating, too, protected the substrate owing to limited nucleation and growth of the deleterious NiO scale in the low-oxygen -activity environment. (C) 2017 Elsevier B.V. All rights reserved.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE SA , 2017. Vol. 317, 17-25 p.
Keyword [en]
HVAF; Coating; Oxidation; Water vapor; Hydrogen; Low-oxygen-activity; Pressure
National Category
Manufacturing, Surface and Joining Technology
Research subject
ENGINEERING, Manufacturing and materials engineering
Identifiers
URN: urn:nbn:se:hv:diva-11396DOI: 10.1016/j.surfcoat.2017.03.049ISI: 000401204600003Scopus ID: 2-s2.0-85016073438OAI: oai:DiVA.org:hv-11396DiVA: diva2:1136151
Funder
Region Västra Götaland, RUN 2016-01489
Note

Projekt PROSAM

Available from: 2017-08-25 Created: 2017-08-25 Last updated: 2017-12-29Bibliographically approved

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Sadeghimeresht, EsmaeilMarkocsan, NicolaieJoshi, Shrikant V.

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Surface & Coatings Technology
Manufacturing, Surface and Joining Technology

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