EFFECT OF THE ADDITION OF CR AND NB ON THE MICROSTRUCTURE AND ELECTROCHEMICAL CORROSION OF HEAT-TREATABLE AL-ZN-MG ALLOYS

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dc.contributor.authorCabot, P. L.
dc.contributor.authorGarrido, J. A.
dc.contributor.authorPerez, E.
dc.contributor.authorMoreira, A. H.
dc.contributor.authorSumodjo, PTA
dc.contributor.authorBenedetti, Assis Vicente [UNESP]
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-20T15:21:13Z
dc.date.available2014-05-20T15:21:13Z
dc.date.issued1995-08-01
dc.description.abstractThe effect of the addition of Cr and Nb on the microstructure and the electrochemical corrosion of the weldable, high-strength and stress corrosion cracking (SCC) resistant Al-5%Zn-1.67%Mg-0.23%Cu alloy (H) has been studied. Combined additions of the alloying elements, J (with Nb), L (with Cr) and O (with Cr and Nb) and different heat treatments, ST (cold-rolled), A (annealed), F (quenched), B (quenched and aged) and C (quenched in two steps and aged), to obtain different microstructures and hardness have been performed. To correlate the electrochemical corrosion with the microstructure of the specimens, corrosion potential (E(cor)) measurements in different chloride solutions were performed and optical microscopy, SEM, TEM and EDX were applied. In chloride solutions containing dissolved O-2 or H2O2, the present alloys were polarized up to the pitting attack. It was shown that the E(cor) measurements were very sensitive to the alloy composition and heat treatment, increasing in the order H < J < L < O < Al (for a given heat treatment) and F < A approximate to ST < B < C (for a given alloy). The MgZn2 precipitates of the annealed (A) and cold-rolled (ST) specimens were dissolved in chloride solutions containing oxidizing agents and pitting attack was shown to develop in the cavities where the precipitates were present. In the specimens B and C, the compositions of the precipitate free zones was found to be equal to that of the matrix solid solution and preferential intergranular attack was not evident, this being in agreement with their SCC resistance. The addition of Cr and Nb increased the pitting corrosion resistance. The effects of Cr and Nb were additive, that of Cr being predominant, either, in the E(cor) shift or in the increase in the pitting corrosion resistance.en
dc.description.affiliationUNIV SAO PAULO,INST QUIM,DEPT QUIM FUNDAMENTAL,BR-01498 SAO PAULO,BRAZIL
dc.description.affiliationUNESP,INST QUIM,DEPT FISICOQUIM,BR-14800 ARARAQUARA,SP,BRAZIL
dc.description.affiliationUnespUNESP,INST QUIM,DEPT FISICOQUIM,BR-14800 ARARAQUARA,SP,BRAZIL
dc.format.extent781-791
dc.identifierhttp://dx.doi.org/10.1007/BF00648634
dc.identifier.citationJournal of Applied Electrochemistry. London: Chapman Hall Ltd, v. 25, n. 8, p. 781-791, 1995.
dc.identifier.doi10.1007/BF00648634
dc.identifier.issn0021-891X
dc.identifier.urihttp://hdl.handle.net/11449/32392
dc.identifier.wosWOS:A1995RP57100009
dc.language.isoeng
dc.publisherChapman Hall Ltd
dc.relation.ispartofJournal of Applied Electrochemistry
dc.relation.ispartofjcr2.262
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.titleEFFECT OF THE ADDITION OF CR AND NB ON THE MICROSTRUCTURE AND ELECTROCHEMICAL CORROSION OF HEAT-TREATABLE AL-ZN-MG ALLOYSen
dc.typeArtigo
dcterms.licensehttp://www.springer.com/open+access/authors+rights
dcterms.rightsHolderChapman Hall Ltd
unesp.author.lattes1769008264876945[6]
unesp.author.orcid0000-0002-0243-6639[6]
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Química, Araraquarapt

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Artigos - Físico Química - IQ