WC-CoCr coatings sprayed by high velocity oxygen-fuel (HVOF) flame on AA7050 aluminum alloy: electrochemical behavior in 3.5% NaCl solution

dc.contributor.authorMagnani, Marina [UNESP]
dc.contributor.authorSuegama, Patrícia Hatsue [UNESP]
dc.contributor.authorRecco, Abel André Cândido
dc.contributor.authorGuilemany, Josep Maria
dc.contributor.authorFugivara, Cecilio Sadao [UNESP]
dc.contributor.authorBenedetti, Assis Vicente [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.contributor.institutionUniversitat de Barcelona Materials Engineering CPT Thermal Spray Centre
dc.date.accessioned2014-05-20T14:18:09Z
dc.date.available2014-05-20T14:18:09Z
dc.date.issued2007-12-01
dc.description.abstractIn the present work, the electrochemical behavior of WC-CoCr coatings with 10 (W10), 15 (W15) and 20 (W20) torch passes sprayed by High Velocity Oxygen-Fuel (HVOF) flame on AA7050 aluminum alloy substrate, evaluated in 3.5% NaCl solution, were compared using open-circuit potential (E OC) measurements, electrochemical impedance spectroscopy (EIS) and polarization curves. The coating surfaces and their cross sections were characterized by X ray diffraction and the Rockwell-C hardness test, and also by optical (OM) and scanning electron microscopy (SEM) before and after the corrosion tests. The electrochemical data showed that sample W10 presented higher corrosion resistance than the others in chloride solutions. In some tests, aluminum salts on the coating surface were identified by EDS, indicating the corrosion of the substrate. and using aluminon, aluminum ions were detected and analyzing the surface via stereomicroscopy, hydrogen bubbles were observed, both showing that the electrolyte reached the substrate and galvanic corrosion possibly occurred. The physical characterization showed that sample W10 presented a lower number of cracks and pores, justifying its higher corrosion resistance.en
dc.description.affiliationUniversidade Estadual Paulista Instituto de Química
dc.description.affiliationUniversidade de São Paulo Escola Politécnica
dc.description.affiliationUniversitat de Barcelona Materials Engineering CPT Thermal Spray Centre
dc.description.affiliationUnespUniversidade Estadual Paulista Instituto de Química
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.format.extent377-385
dc.identifierhttp://dx.doi.org/10.1590/S1516-14392007000400010
dc.identifier.citationMaterials Research. ABM, ABC, ABPol, v. 10, n. 4, p. 377-385, 2007.
dc.identifier.doi10.1590/S1516-14392007000400010
dc.identifier.fileS1516-14392007000400010.pdf
dc.identifier.issn1516-1439
dc.identifier.lattes2797127887030838
dc.identifier.scieloS1516-14392007000400010
dc.identifier.urihttp://hdl.handle.net/11449/25473
dc.language.isoeng
dc.publisherABM, ABC, ABPol
dc.relation.ispartofMaterials Research
dc.relation.ispartofjcr1.103
dc.relation.ispartofsjr0,398
dc.rights.accessRightsAcesso aberto
dc.sourceSciELO
dc.subjectcorrosion resistanceen
dc.subjectEISen
dc.subjectHVOFen
dc.subjectWC-CoCren
dc.subjectaluminum alloyen
dc.titleWC-CoCr coatings sprayed by high velocity oxygen-fuel (HVOF) flame on AA7050 aluminum alloy: electrochemical behavior in 3.5% NaCl solutionen
dc.typeArtigo
unesp.author.lattes2797127887030838[5]
unesp.author.lattes1769008264876945[6]
unesp.author.orcid0000-0002-0243-6639[6]
unesp.author.orcid0000-0002-2288-2601[5]
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Química, Araraquarapt

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