Publicação:
Tetragonal to monoclinic phase transition observed during Zr anodisation

dc.contributor.authorTrivinho-Strixino, Francisco
dc.contributor.authorDa Silva, Donizete X.
dc.contributor.authorPaiva-Santos, Carlos O. [UNESP]
dc.contributor.authorPereira, Ernesto C.
dc.contributor.institutionUniversidade Federal de São Carlos (UFSCar)
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade Federal de Tocantins
dc.date.accessioned2014-05-27T11:27:27Z
dc.date.available2014-05-27T11:27:27Z
dc.date.issued2013-01-01
dc.description.abstractPlasma electrolytic oxidation (PEO) is a coating procedure that utilises anodic oxidation in aqueous electrolytes above the dielectric breakdown voltage to produce oxide coatings that have specific properties. These conditions facilitate oxide formation under localised high temperatures and pressures that originate from short-lived microdischarges at sites over the metal surface and have fast oxide volume expansion. Anodic ZrO2 films were prepared by subjecting metallic zirconium to PEO in acid solutions (H2C 2O4 and H3PO4) using a galvanostatic DC regime. The ZrO2 microstructure was investigated in films that were prepared at different charge densities. During the anodic breakdown, an important change in the amplitude of the voltage oscillations at a specific charge density was observed (i.e., the transition charge density (Q T)). We verified that this transition charge is a monotonic function of both the current density and temperature applied during the anodisation, which indicated that Q T is an intrinsic response of this system. The oxide morphology and microstructure were characterised using SEM and X-ray diffraction experiments (XRD) techniques. X-ray diffraction analysis revealed that the change in voltage oscillation was correlated with oxide microstructure changes during the breakdown process. © 2012 Springer-Verlag Berlin Heidelberg.en
dc.description.affiliationDepartamento de Física, Química e Matemática Universidade Federal de São Carlos, São Carlos SP
dc.description.affiliationLaboratório Computacional de Análises Cristalográ ficas e Cristalinas Depto de Físico-Química Universidade Estadual Paulista, Araraquara SP
dc.description.affiliationDepartamento de Química Universidade Federal de São Carlos, Rod. Washington Luis Km 235, Cx 676, São Carlos SP
dc.description.affiliationUniversidade Federal de Tocantins, Palmas, TO
dc.description.affiliationUnespLaboratório Computacional de Análises Cristalográ ficas e Cristalinas Depto de Físico-Química Universidade Estadual Paulista, Araraquara SP
dc.format.extent191-199
dc.identifierhttp://dx.doi.org/10.1007/s10008-012-1883-4
dc.identifier.citationJournal of Solid State Electrochemistry, v. 17, n. 1, p. 191-199, 2013.
dc.identifier.doi10.1007/s10008-012-1883-4
dc.identifier.issn1432-8488
dc.identifier.scopus2-s2.0-84872299505
dc.identifier.urihttp://hdl.handle.net/11449/74124
dc.identifier.wosWOS:000313046100021
dc.language.isoeng
dc.relation.ispartofJournal of Solid State Electrochemistry
dc.relation.ispartofjcr2.509
dc.relation.ispartofsjr0,661
dc.rights.accessRightsAcesso restrito
dc.sourceScopus
dc.subjectAnodic breakdown
dc.subjectAnodic films
dc.subjectMicrostructure
dc.subjectPhase transformation
dc.subjectPlasma electrolytic oxidation (PEO)
dc.subjectValve metals
dc.subjectZrO2
dc.subjectPlasma electrolytic oxidation
dc.subjectValve metal
dc.subjectAnodic oxidation
dc.subjectCharge density
dc.subjectElectric breakdown
dc.subjectElectrolysis
dc.subjectPhase transitions
dc.subjectProtective coatings
dc.subjectX ray diffraction analysis
dc.subjectZirconium
dc.subjectZirconium alloys
dc.subjectFilm preparation
dc.titleTetragonal to monoclinic phase transition observed during Zr anodisationen
dc.typeArtigo
dcterms.licensehttp://www.springer.com/open+access/authors+rights
dspace.entity.typePublication
unesp.campusUniversidade Estadual Paulista (UNESP), Instituto de Química, Araraquarapt
unesp.departmentFísico-Química - IQARpt

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