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Title

Galvanic corrosion of rare earth modified AM50 and AZ91D magnesium alloys coupled to steel and aluminium alloys

AuthorsMohedano, M.; Arrabal, R.; Pardo, A.; Paucar, K.; Merino, M.C.; Matykina, E.; Mingo, B.; Garcés, Gerardo
KeywordsMagnesium alloys
Weight loss
Polarization
Galvanic corrosion
Issue Date2014
PublisherConsejo Superior de Investigaciones Científicas (España)
CitationRevista de Metalurgia 50 (1): e002 (2014)
AbstractElectrochemical and gravimetric measurements were used to examine the effects of neodymium and gadolinium additions on the galvanic corrosion behaviour of AM50 and AZ91D magnesium alloys coupled to A 570 Gr 36 carbon steel and AA2011-AA6082 aluminium alloys. Rare earth modified alloys showed Al 2Nd/Al2Gd and Al-Mn-Nd/Al-Mn-Gd intermetallics, reduced area fraction of β-Mg17Al12 phase and increased corrosion resistance due to increased surface passivity and suppression of micro-galvanic couples. Neodymium and gadolinium additions improved the galvanic corrosion resistance of AM50 alloy, but were less effective in case of the AZ91D alloy. The AA6082 alloy was the most compatible material and the AA2011 alloy was the least compatible. © 2014 CSIC.
URIhttp://hdl.handle.net/10261/113505
DOI10.3989/revmetalm.002
Identifiersdoi: 10.3989/revmetalm.002
issn: 1988-4222
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