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Duplex thermal spray coatings: a critical approach to extend the service-life of metallic components
Högskolan Väst, Institutionen för ingenjörsvetenskap, Avdelningen för avverkande och additativa tillverkningsprocesser (AAT). (PTW)ORCID-id: 0000-0002-7663-9631
Högskolan Väst, Institutionen för ingenjörsvetenskap, Avdelningen för avverkande och additativa tillverkningsprocesser (AAT). (PTW)ORCID-id: 0000-0002-9578-4076
Högskolan Väst, Institutionen för ingenjörsvetenskap, Avdelningen för avverkande och additativa tillverkningsprocesser (AAT). (PTW)ORCID-id: 0000-0001-7787-5444
2016 (engelsk)Konferansepaper, Oral presentation only (Annet vitenskapelig)
Abstract [en]

Corrosion is a common problem for many metallic components used today in a wide range of industries. Thermal spraying is a promising approach to properly protect the metallic structure from the deleterious effects of the environment that surrounds it. In this study, three types of coating systems (A: single layer of Cr3C2-NiCr, B: Ni/Cr3C2-NiCr and C: NiCr/Cr3C2-NiCr) were deposited using HVAF process. Electrochemical tests were employed to investigate the corrosion susceptibility of the above systems. OCP, polarization and EIS tests were performed in 3.5 wt.% NaCl solution at 25°C. Results showed that bi-layer coatings exhibited a better corrosion resistance than the single-layer coating. While coating system A demonstrated some signs of pitting due to the penetration of tiny chloride ions through the defects of the coating, which eventually led to the destruction of the substrate close to the interface, coating systems B and C showed much better anti-corrosion behavior. Moreover, the results confirmed that gradual changes of the composition from the top coating to substrate reduced the possibility of galvanic corrosion. SEM, EDAX, and XRD were used to characterize the corrosion products along the surface and the cross-section of specimens.

sted, utgiver, år, opplag, sider
2016.
Emneord [en]
Bi-layer coating, Corrosion, Thermal spraying, HVAF, EIS, polarization
HSV kategori
Forskningsprogram
Produktionsteknik; TEKNIK, Produktions- och materialteknik
Identifikatorer
URN: urn:nbn:se:hv:diva-10546OAI: oai:DiVA.org:hv-10546DiVA, id: diva2:1064191
Konferanse
ITSC 2016, International Thermal Spray Conference, Shanghai, P.R. China, May 10-12, 2016
Tilgjengelig fra: 2017-01-12 Laget: 2017-01-12 Sist oppdatert: 2018-08-12bibliografisk kontrollert

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Sadeghimeresht, EsmaeilMarkocsan, NicolaieNylén, Per

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