Selective corrosion in sodium chloride aqueous solution of cupronickel alloys with aluminum and iron additions

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dc.contributor.authorLiberto R.C.N.
dc.contributor.authorMagnabosco R.
dc.contributor.authorAlonso-Falleiros N.
dc.date.accessioned2019-08-20T00:17:35Z
dc.date.available2019-08-20T00:17:35Z
dc.date.issued2007
dc.description.abstractCupronickel pipes are widely used in cooling systems. Under this application, localized corrosion is observed, particularly associated with selective corrosion of nickel (denickelification). This work studied the denickelification process in solution-treated cupronickel alloys 90-10 (Cu-10wt%Ni), with aluminum and iron additions, in 0.01 M, 0.1 M, or 0.6 M sodium chloride (NaCl) aqueous solutions. Polished surfaces of the studied materials were submitted to potentiodynamic polarization, and after that, the polarized surfaces were studied using optical microscopy (OM) and scanning electron microscopy (SEM) assisted by energy-dispersive spectroscopy (EDS). A passivity break potential (Epb) was determined in all solutions, related to the initiation of selective corrosion of nickel. When submitted to cyclic potentiodynamic polarization, alloys with higher Epb showed the higher nickel losses in localized spots. However, potentiodynamic polarization tests conducted in 0.01 M NaCl until current densities of 10-1 A/cm2 were reached showed that the selective corrosion process was stopped by the formation of copper-rich corrosion products over the surface. © 2007, NACE International.
dc.description.firstpage211
dc.description.issuenumber3
dc.description.lastpage219
dc.description.volume63
dc.identifier.citationLiberto, R. C. N.; MAGNABOSCO, R.; Alonso-Falleiros, N.. Selective Corrosion in Sodium Chloride Aqueous Solution of Cupronickel Alloys with Aluminum and Iron Additions. Corrosion (Houston, Tex.), v. 63, n. 3, p. 211, 2007.
dc.identifier.doi10.5006/1.3278345
dc.identifier.issn0010-9312
dc.identifier.urihttps://repositorio.fei.edu.br/handle/FEI/2269
dc.relation.ispartofCorrosion
dc.rightsAcesso Restrito
dc.subject.otherlanguageCupronickel alloys
dc.subject.otherlanguageDenickelification
dc.subject.otherlanguagePotentiodynamic polarization
dc.subject.otherlanguageSelective corrosion
dc.titleSelective corrosion in sodium chloride aqueous solution of cupronickel alloys with aluminum and iron additions
dc.typeArtigo
fei.scopus.citations10
fei.scopus.eid2-s2.0-34248231115
fei.scopus.subjectCupronickel alloys
fei.scopus.subjectCyclic potentiodynamic polarization
fei.scopus.subjectDenickelification
fei.scopus.subjectSelective corrosion
fei.scopus.updated2024-03-04
fei.scopus.urlhttps://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=34248231115&origin=inward
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