The relation between Mn additions, microstructure and corrosion behavior of new wrought Mg-5Al alloys

Polina Metalnikov; Guy Ben-Hamu; Yael Templeman; Kwang Seon Shin; Louisa Meshi

doi:10.1016/j.matchar.2018.08.033

The relation between Mn additions, microstructure and corrosion behavior of new wrought Mg-5Al alloys

Polina Metalnikov, Guy Ben-Hamu, Yael Templeman, Kwang Seon Shin, Louisa Meshi

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

36 Scopus citations

Abstract

Three wrought Mg-5Al alloys with different Mn contents (0.5, 1.4, and 3.1 wt%) were examined and compared with a reference wrought Mg-5Al alloy. Additions of Mn decreased the grain size and caused precipitation of various Al-Mn intermetallide with different Al/Mn ratio. The corrosion resistance of the Mn-containing alloys significantly increased in comparison to the reference alloy. This contributed to a reduced harmful effect of the impurities, refined microstructure and formation of corrosion products layer. However, further increasing of Mn content caused greater precipitation of the Al-Mn intermetallics, which in its turn increased the galvanic micro-coupling. The alloy with 3.1 wt% Mn additions formed a relatively protective oxide film, which balances the increased number of cathodic particles, and its corrosion rate was very close to that of alloy with 1.4 wt% Mn content.

Original language	English
Pages (from-to)	101-115
Number of pages	15
Journal	Materials Characterization
Volume	145
DOIs	https://doi.org/10.1016/j.matchar.2018.08.033
State	Published - Nov 2018
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2018 Elsevier Inc.

Keywords

Corrosion resistance
Magnesium alloys
Microstructure
Mn content
SKPFM

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10.1016/j.matchar.2018.08.033

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title = "The relation between Mn additions, microstructure and corrosion behavior of new wrought Mg-5Al alloys",

abstract = "Three wrought Mg-5Al alloys with different Mn contents (0.5, 1.4, and 3.1 wt%) were examined and compared with a reference wrought Mg-5Al alloy. Additions of Mn decreased the grain size and caused precipitation of various Al-Mn intermetallide with different Al/Mn ratio. The corrosion resistance of the Mn-containing alloys significantly increased in comparison to the reference alloy. This contributed to a reduced harmful effect of the impurities, refined microstructure and formation of corrosion products layer. However, further increasing of Mn content caused greater precipitation of the Al-Mn intermetallics, which in its turn increased the galvanic micro-coupling. The alloy with 3.1 wt% Mn additions formed a relatively protective oxide film, which balances the increased number of cathodic particles, and its corrosion rate was very close to that of alloy with 1.4 wt% Mn content.",

keywords = "Corrosion resistance, Magnesium alloys, Microstructure, Mn content, SKPFM",

author = "Polina Metalnikov and Guy Ben-Hamu and Yael Templeman and Shin, {Kwang Seon} and Louisa Meshi",

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AU - Metalnikov, Polina

AU - Ben-Hamu, Guy

AU - Templeman, Yael

AU - Shin, Kwang Seon

AU - Meshi, Louisa

PY - 2018/11

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N2 - Three wrought Mg-5Al alloys with different Mn contents (0.5, 1.4, and 3.1 wt%) were examined and compared with a reference wrought Mg-5Al alloy. Additions of Mn decreased the grain size and caused precipitation of various Al-Mn intermetallide with different Al/Mn ratio. The corrosion resistance of the Mn-containing alloys significantly increased in comparison to the reference alloy. This contributed to a reduced harmful effect of the impurities, refined microstructure and formation of corrosion products layer. However, further increasing of Mn content caused greater precipitation of the Al-Mn intermetallics, which in its turn increased the galvanic micro-coupling. The alloy with 3.1 wt% Mn additions formed a relatively protective oxide film, which balances the increased number of cathodic particles, and its corrosion rate was very close to that of alloy with 1.4 wt% Mn content.

AB - Three wrought Mg-5Al alloys with different Mn contents (0.5, 1.4, and 3.1 wt%) were examined and compared with a reference wrought Mg-5Al alloy. Additions of Mn decreased the grain size and caused precipitation of various Al-Mn intermetallide with different Al/Mn ratio. The corrosion resistance of the Mn-containing alloys significantly increased in comparison to the reference alloy. This contributed to a reduced harmful effect of the impurities, refined microstructure and formation of corrosion products layer. However, further increasing of Mn content caused greater precipitation of the Al-Mn intermetallics, which in its turn increased the galvanic micro-coupling. The alloy with 3.1 wt% Mn additions formed a relatively protective oxide film, which balances the increased number of cathodic particles, and its corrosion rate was very close to that of alloy with 1.4 wt% Mn content.

KW - Corrosion resistance

KW - Magnesium alloys

KW - Microstructure

KW - Mn content

KW - SKPFM

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The relation between Mn additions, microstructure and corrosion behavior of new wrought Mg-5Al alloys

Abstract

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Keywords

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