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Corrosion performance of bi-layer Ni/Cr2C3–NiCr HVAF thermal spray coating
Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd Forskningsmiljön industriprocesser. Amirkabir University of Tehran, Tarbiat Modares University of Tehran. (Thermal Spray, PTW)ORCID-id: 0000-0002-7663-9631
Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för tillverkningsprocesser. (PTW)ORCID-id: 0000-0002-9578-4076
Högskolan Väst, Institutionen för ingenjörsvetenskap, Forskningsmiljön produktionsteknik(PTW). (PTW)ORCID-id: 0000-0001-7787-5444
Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för maskinteknik. (PTW)
2016 (Engelska)Ingår i: Applied Surface Science, ISSN 0169-4332, E-ISSN 1873-5584, Vol. 369, s. 470-481Artikel, forskningsöversikt (Refereegranskat) Published
Abstract [en]

The corrosion behavior of three HVAF thermal spray coating systems (A: single-layer Ni, B: single-layer Cr2C3–NiCr coatings, and C: bi-layer Ni/Cr2C3–NiCr coating) was comparatively studied using immersion,salt spray, and electrochemical tests. Polarization and EIS results showed that the corrosion behavior of Cr2C3–NiCr coatings in 3.5 wt.% NaCl solution was significantly improved by adding the intermediate layer of Ni. It was illustrated that the polarization resistance of the bi-layer Ni/Cr2C3–NiCr and singlelayerCr2C3–NiCr coatings were around 194 and 38 k cm2, respectively. Microstructure analysis revealed that the bond coating successfully prevented the corrosion propagation toward the coating.

Ort, förlag, år, upplaga, sidor
2016. Vol. 369, s. 470-481
Nyckelord [en]
Thermal spray, HVAF Corrosion, EIS, Polarization, Immersion test
Nationell ämneskategori
Bearbetnings-, yt- och fogningsteknik
Forskningsämne
Produktionsteknik
Identifikatorer
URN: urn:nbn:se:hv:diva-9293DOI: 10.1016/j.apsusc.2016.02.002ISI: 000374203000060Scopus ID: 2-s2.0-84958787256OAI: oai:DiVA.org:hv-9293DiVA, id: diva2:917622
Tillgänglig från: 2016-04-07 Skapad: 2016-04-07 Senast uppdaterad: 2019-05-20Bibliografiskt granskad
Ingår i avhandling
1. Corrosion Behavior of HVAF-Sprayed Bi-Layer Coatings
Öppna denna publikation i ny flik eller fönster >>Corrosion Behavior of HVAF-Sprayed Bi-Layer Coatings
2016 (Engelska)Licentiatavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

In a variety of engineering applications, components are subjected to corrosive environment. Protective coatings are essential to improve the functional performances and/or extend the lifetime of the components. Thermal sprayingas 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. The recently developed supersonic spray method, High-Velocity-Air-Fuel (HVAF), brings significant advantages in terms of cost and coating properties. Although severely reduced, the pores are not completely eliminated even with the HVAF process. 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 important 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. Therefore, the objective of the researchis to explore the relationships between feedstock material, spraying process, microstructure and corrosion behavior of bi-layer coatings. A specific motivationis to understand the corrosion mechanisms of the intermediate layer which forms the basis for developing superior protective coatings. Cr3C2-NiCr top layer and intermediate layers (Fe-, Co- and Ni-based) were sprayed by different thermal spraying processes. Microstructure analysis, as well as various corrosion tests, e.g., electrochemical, salt spray and immersion tests 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 coatings 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.

Ort, förlag, år, upplaga, sidor
Trollhättan: University West, 2016. s. 59
Serie
Licentiate Thesis: University West ; 10
Nyckelord
Thermal spray coating, HVAF, Corrosion protection, Galvanic corrosion, Composition, Microstructure, EIS, Polarization, OCP
Nationell ämneskategori
Produktionsteknik, arbetsvetenskap och ergonomi
Forskningsämne
Produktionsteknik
Identifikatorer
urn:nbn:se:hv:diva-9929 (URN)978-91-87531-33-0 (ISBN)978-91-87531-32-3 (ISBN)
Presentation
2016-09-30, C118, University West, Trollhättan, 10:15 (Engelska)
Handledare
Tillgänglig från: 2016-09-30 Skapad: 2016-09-22 Senast uppdaterad: 2016-09-30Bibliografiskt granskad

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Sadeghimeresht, EsmaeilMarkocsan, NicolaieNylén, PerBjörklund, Stefan

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