Electrochemical Corrosion Characterization of Submicron WC-12Co Coatings Produced by CGS and HVAF Compared with Sintered Bulks
Autor(a) principal: | |
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Data de Publicação: | 2022 |
Outros Autores: | , , , , , , , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.3390/coatings12050620 http://hdl.handle.net/11449/241835 |
Resumo: | The electrochemical corrosion performance of WC-12 wt% Co in coating and bulk forms has been evaluated in a 3.56 wt% NaCl solution. The coatings were deposited by means of thermal spray techniques, i.e., cold gas spraying (CGS) and high-velocity air fuel (HVAF) spraying, while bulks with different WC sizes were manufactured by conventional pressing and sintering. Microstructural characterizations and phase composition determinations were carried out using scanning electron microscopy and X-ray diffraction. Differences in WC grain size and morphology, carbide dissolution, and cobalt binder phase transformation are discussed according to the inherent characteristics of each processing method. Together with surface roughness (polished/as-sprayed), these features have been observed to directly affect the electrochemical corrosion performance. Electrochemical measurements (open circuit potential, polarization resistance, electrochemical impedance spectroscopy, and polarization curves) showed that the as-sprayed CGS coating presented an electrochemical behavior similar to those of the bulk materials. This was attributed to the higher metallic character of this coating in comparison to that of the HVAF coating. The polished HVAF coating showed anodic activity lower than those of the bulk samples, most likely due to the presence of cobalt–tungsten carbide phases and eventually the lower amount of Co available for dissolution. Finally, the as-sprayed HVAF coating showed very high resistivity due to the presence of surface oxides generated during the deposition process. |
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Electrochemical Corrosion Characterization of Submicron WC-12Co Coatings Produced by CGS and HVAF Compared with Sintered Bulkscemented carbidescold gas spraycorrosionhigh-velocity air fuelthermal spray coatingsThe electrochemical corrosion performance of WC-12 wt% Co in coating and bulk forms has been evaluated in a 3.56 wt% NaCl solution. The coatings were deposited by means of thermal spray techniques, i.e., cold gas spraying (CGS) and high-velocity air fuel (HVAF) spraying, while bulks with different WC sizes were manufactured by conventional pressing and sintering. Microstructural characterizations and phase composition determinations were carried out using scanning electron microscopy and X-ray diffraction. Differences in WC grain size and morphology, carbide dissolution, and cobalt binder phase transformation are discussed according to the inherent characteristics of each processing method. Together with surface roughness (polished/as-sprayed), these features have been observed to directly affect the electrochemical corrosion performance. Electrochemical measurements (open circuit potential, polarization resistance, electrochemical impedance spectroscopy, and polarization curves) showed that the as-sprayed CGS coating presented an electrochemical behavior similar to those of the bulk materials. This was attributed to the higher metallic character of this coating in comparison to that of the HVAF coating. The polished HVAF coating showed anodic activity lower than those of the bulk samples, most likely due to the presence of cobalt–tungsten carbide phases and eventually the lower amount of Co available for dissolution. Finally, the as-sprayed HVAF coating showed very high resistivity due to the presence of surface oxides generated during the deposition process.Hyperion Materials & TechnologiesInstituto de Química University Estadual Paulista—UNESP, SPFraunhofer-Institute for Ceramic Technologies and Systems IKTSDepartament de Ciència dels Materials i Química Física Universitat de BarcelonaMaterials Science and Environmental Engineering Faculty of Engineering and Natural Sciences Tampere UniversityInstituto Federal de Mato Grosso, Campus Juína, MTValmet Technologies OyInstituto de Química University Estadual Paulista—UNESP, SPHyperion Materials & TechnologiesUniversidade Estadual Paulista (UNESP)Fraunhofer-Institute for Ceramic Technologies and Systems IKTSUniversitat de BarcelonaTampere UniversityInstituto Federal de Mato GrossoValmet Technologies OyCinca, NúriaLavigne, OlivierPeres, Riberto Nunes [UNESP]Conze, SusanHoehn, SoerenDosta, SergiKoivuluoto, HeliKim, Chungda Silva, Fernando SantosMatikainen, VilleJafari, RezaTarrés, ElenaBenedetti, Assis Vicente [UNESP]2023-03-02T00:30:01Z2023-03-02T00:30:01Z2022-05-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://dx.doi.org/10.3390/coatings12050620Coatings, v. 12, n. 5, 2022.2079-6412http://hdl.handle.net/11449/24183510.3390/coatings120506202-s2.0-85129963199Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengCoatingsinfo:eu-repo/semantics/openAccess2023-03-02T00:30:01Zoai:repositorio.unesp.br:11449/241835Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462023-03-02T00:30:01Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Electrochemical Corrosion Characterization of Submicron WC-12Co Coatings Produced by CGS and HVAF Compared with Sintered Bulks |
title |
Electrochemical Corrosion Characterization of Submicron WC-12Co Coatings Produced by CGS and HVAF Compared with Sintered Bulks |
spellingShingle |
Electrochemical Corrosion Characterization of Submicron WC-12Co Coatings Produced by CGS and HVAF Compared with Sintered Bulks Cinca, Núria cemented carbides cold gas spray corrosion high-velocity air fuel thermal spray coatings |
title_short |
Electrochemical Corrosion Characterization of Submicron WC-12Co Coatings Produced by CGS and HVAF Compared with Sintered Bulks |
title_full |
Electrochemical Corrosion Characterization of Submicron WC-12Co Coatings Produced by CGS and HVAF Compared with Sintered Bulks |
title_fullStr |
Electrochemical Corrosion Characterization of Submicron WC-12Co Coatings Produced by CGS and HVAF Compared with Sintered Bulks |
title_full_unstemmed |
Electrochemical Corrosion Characterization of Submicron WC-12Co Coatings Produced by CGS and HVAF Compared with Sintered Bulks |
title_sort |
Electrochemical Corrosion Characterization of Submicron WC-12Co Coatings Produced by CGS and HVAF Compared with Sintered Bulks |
author |
Cinca, Núria |
author_facet |
Cinca, Núria Lavigne, Olivier Peres, Riberto Nunes [UNESP] Conze, Susan Hoehn, Soeren Dosta, Sergi Koivuluoto, Heli Kim, Chung da Silva, Fernando Santos Matikainen, Ville Jafari, Reza Tarrés, Elena Benedetti, Assis Vicente [UNESP] |
author_role |
author |
author2 |
Lavigne, Olivier Peres, Riberto Nunes [UNESP] Conze, Susan Hoehn, Soeren Dosta, Sergi Koivuluoto, Heli Kim, Chung da Silva, Fernando Santos Matikainen, Ville Jafari, Reza Tarrés, Elena Benedetti, Assis Vicente [UNESP] |
author2_role |
author author author author author author author author author author author author |
dc.contributor.none.fl_str_mv |
Hyperion Materials & Technologies Universidade Estadual Paulista (UNESP) Fraunhofer-Institute for Ceramic Technologies and Systems IKTS Universitat de Barcelona Tampere University Instituto Federal de Mato Grosso Valmet Technologies Oy |
dc.contributor.author.fl_str_mv |
Cinca, Núria Lavigne, Olivier Peres, Riberto Nunes [UNESP] Conze, Susan Hoehn, Soeren Dosta, Sergi Koivuluoto, Heli Kim, Chung da Silva, Fernando Santos Matikainen, Ville Jafari, Reza Tarrés, Elena Benedetti, Assis Vicente [UNESP] |
dc.subject.por.fl_str_mv |
cemented carbides cold gas spray corrosion high-velocity air fuel thermal spray coatings |
topic |
cemented carbides cold gas spray corrosion high-velocity air fuel thermal spray coatings |
description |
The electrochemical corrosion performance of WC-12 wt% Co in coating and bulk forms has been evaluated in a 3.56 wt% NaCl solution. The coatings were deposited by means of thermal spray techniques, i.e., cold gas spraying (CGS) and high-velocity air fuel (HVAF) spraying, while bulks with different WC sizes were manufactured by conventional pressing and sintering. Microstructural characterizations and phase composition determinations were carried out using scanning electron microscopy and X-ray diffraction. Differences in WC grain size and morphology, carbide dissolution, and cobalt binder phase transformation are discussed according to the inherent characteristics of each processing method. Together with surface roughness (polished/as-sprayed), these features have been observed to directly affect the electrochemical corrosion performance. Electrochemical measurements (open circuit potential, polarization resistance, electrochemical impedance spectroscopy, and polarization curves) showed that the as-sprayed CGS coating presented an electrochemical behavior similar to those of the bulk materials. This was attributed to the higher metallic character of this coating in comparison to that of the HVAF coating. The polished HVAF coating showed anodic activity lower than those of the bulk samples, most likely due to the presence of cobalt–tungsten carbide phases and eventually the lower amount of Co available for dissolution. Finally, the as-sprayed HVAF coating showed very high resistivity due to the presence of surface oxides generated during the deposition process. |
publishDate |
2022 |
dc.date.none.fl_str_mv |
2022-05-01 2023-03-02T00:30:01Z 2023-03-02T00:30:01Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.3390/coatings12050620 Coatings, v. 12, n. 5, 2022. 2079-6412 http://hdl.handle.net/11449/241835 10.3390/coatings12050620 2-s2.0-85129963199 |
url |
http://dx.doi.org/10.3390/coatings12050620 http://hdl.handle.net/11449/241835 |
identifier_str_mv |
Coatings, v. 12, n. 5, 2022. 2079-6412 10.3390/coatings12050620 2-s2.0-85129963199 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Coatings |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.source.none.fl_str_mv |
Scopus reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1797790126205566976 |