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Corrosion Behavior of HVAF-Sprayed Bi-Layer Coatings: Effect of Intermediate Layer's Microstructure and Composition
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 Subtractive and Additive Manufacturing. (PTW)ORCID iD: 0000-0002-9578-4076
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. (PTW)ORCID iD: 0000-0001-7787-5444
2017 (English)Conference paper, Poster (with or without abstract) (Other academic)
Abstract [en]

In a variety of engineering applications, components are exposed to corrosive environment. Protective coatings are essential to improve the functional performances and/or extend the lifetime of the components. Thermal spraying as a cost-effective coating deposition technique offers high flexibility in coatings chemistry/morphology/microstructure design. However, the inherent pores formed during spraying limit the use of coatings for corrosion protection. In view of the above gap to have a high quality coating, bi-layer coatings have been developed to improve the corrosion resistance of the coatings. In a bi-layer coating, an intermediate layer is deposited on the substrate before spraying the coating. The electrochemical behavior of each layer is critical to ensure a good corrosion protection. The corrosion behavior of the layers strongly depends on coating composition and microstructure, which are affected by feedstock material and spraying process. In the present work, Cr3C2-NiCr top layer and intermediate layers (Fe-, Co- and Ni-based) were sprayed by high-velocity air fuel (HVAF) process. Microstructure analysis, as well as various electrochemical tests, e.g., open-circuit potential (OCP), polarization and electrochemical impedance spectroscopy (EIS) were performed. The results showed a direct link between the corrosion potential (Ecorr) of the intermediate layer and the corrosion mechanisms. It was found that the higher corrosion resistance of Ni-based intermediate layers than Fe- and Co-based coatings was due to higher Ecorr of the coating in the galvanic couple with top layers. Inter-lamellar boundaries and interconnected pores reduced the corrosion resistance of intermediate layers, however a sufficient reservoir of protective scale-forming elements (such as Cr or Al) improved the corrosion behavior.

Place, publisher, year, edition, pages
2017. p. 1-1
National Category
Manufacturing, Surface and Joining Technology
Research subject
ENGINEERING, Manufacturing and materials engineering; Production Technology
Identifiers
URN: urn:nbn:se:hv:diva-11955OAI: oai:DiVA.org:hv-11955DiVA, id: diva2:1169594
Conference
International Thermal Spray Conference & Exhibition, ITSC 2017, Düsseldorf, Germany, June 7-9, 2017
Available from: 2017-12-28 Created: 2017-12-28 Last updated: 2017-12-28Bibliographically approved

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Sadeghimeresht, EsmaeilMarkocsan, NicolaieNylen, Per

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