dc.contributorUniversitat de Barcelona
dc.contributorUniversidade Estadual Paulista (Unesp)
dc.contributorUniversidade de São Paulo (USP)
dc.date.accessioned2014-05-27T11:17:28Z
dc.date.available2014-05-27T11:17:28Z
dc.date.created2014-05-27T11:17:28Z
dc.date.issued1992-06-01
dc.identifierJournal of Applied Electrochemistry, v. 22, n. 6, p. 541-552, 1992.
dc.identifier0021-891X
dc.identifier1572-8838
dc.identifierhttp://hdl.handle.net/11449/64236
dc.identifier10.1007/BF01024095
dc.identifier2-s2.0-0026881903
dc.description.abstractThe localized corrosion of Al-(5.03%)Zn-(1.67%)Mg-(0.23%)Cu alloys and high purity Al has been studied using electrochemical techniques, optical microscopy, SEM and EDX. The samples were previously submitted to different heat treatments in which coherent and incoherent MgZn 2 precipitates with different distribution and aggregation degree were produced. The influence of NaCl and Na 2SO 4, dissolved oxygen, immersion time and convection were studied. In NaCl solutions, pitting potentials for the alloys were more negative than for aluminium, indicating an increase in their susceptibility to localized corrosion. Moreover, annealed and cold-rolled alloys presented more negative pitting and repassivation potentials than those submitted to age hardening with direct or interrupted quenching. In annealed and cold-rolled samples, pit nucleation and propagation takes place in the zones where MgZn 2 is accumulated. In the case of the age-hardened alloys, a double pitting behaviour is observed, the first one in the magnesium and zinc enriched regions and the second in the matrix. While the cold water quenched alloy is susceptible to stress corrosion craking, the alloy submitted to the interrupted quenching process is less susceptible to intergranular attack. The sulphate ion shifts the pitting potential of aluminium and the alloys by chloride towards more positive values because it impedes local accumulations of the latter. © 1992 Chapman & Hall.
dc.languageeng
dc.relationJournal of Applied Electrochemistry
dc.relation2.262
dc.relation0,646
dc.rightsAcesso restrito
dc.sourceScopus
dc.subjectAluminum Metallography - Precipitation
dc.subjectCorrosion - Electrochemical
dc.subjectHeat Treatment - Effects
dc.subjectElectrochemical Corrosion
dc.subjectMagnesium Zinc Precipitates
dc.subjectAluminum Zinc Magnesium Alloys
dc.titleInfluence of the heat treatment in the electrochemical corrosion of Al-Zn-Mg alloys
dc.typeArtículos de revistas


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