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

Marta Mohedano; Raúl Arrabal; Angel Pardo; Karín Paucar; M. Concepción Merino; Endzhe Matykina; Beatriz Mingo; Gerardo Garcés

doi:10.3989/revmetalm.002

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

Marta Mohedano, Raúl Arrabal, Angel Pardo, Karín Paucar, M. Concepción Merino, Endzhe Matykina, Beatriz Mingo, Gerardo Garcés

Research output: Contribution to journal › Article › peer-review

Abstract

Electrochemical 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.

Original language	English
Journal	Revista de Metalurgia
Volume	50
Issue number	1
DOIs	https://doi.org/10.3989/revmetalm.002
Publication status	Published - 1 Jan 2014

Keywords

Galvanic corrosion
Magnesium alloys
Polarization
Weight loss

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10.3989/revmetalm.002

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abstract = "Electrochemical 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.",

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T1 - Galvanic corrosion of rare earth modified AM50 and AZ91D magnesium alloys coupled to steel and aluminium alloys

AU - Mohedano, Marta

AU - Arrabal, Raúl

AU - Pardo, Angel

AU - Paucar, Karín

AU - Merino, M. Concepción

AU - Matykina, Endzhe

AU - Mingo, Beatriz

AU - Garcés, Gerardo

PY - 2014/1/1

Y1 - 2014/1/1

N2 - Electrochemical 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.

AB - Electrochemical 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.

KW - Galvanic corrosion

KW - Magnesium alloys

KW - Polarization

KW - Weight loss

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

Abstract

Keywords

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