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Role of Ca on the corrosion resistance of Mg–9Al and Mg–9Al–0.5Mn alloys

Research output: Journal contributions › Journal articles › Research › peer-review

Standard

Role of Ca on the corrosion resistance of Mg–9Al and Mg–9Al–0.5Mn alloys. / Mingo, Beatritz; Mohedano, M.; Blawert, C. et al.
In: Journal of Alloys and Compounds, Vol. 811, 151992, 30.11.2019.

Research output: Journal contributions › Journal articles › Research › peer-review

Harvard

Mingo, B, Mohedano, M, Blawert, C, del Olmo, R, Hort, N & Arrabal, R 2019, 'Role of Ca on the corrosion resistance of Mg–9Al and Mg–9Al–0.5Mn alloys', Journal of Alloys and Compounds, vol. 811, 151992. https://doi.org/10.1016/j.jallcom.2019.151992

APA

Mingo, B., Mohedano, M., Blawert, C., del Olmo, R., Hort, N., & Arrabal, R. (2019). Role of Ca on the corrosion resistance of Mg–9Al and Mg–9Al–0.5Mn alloys. Journal of Alloys and Compounds, 811, Article 151992. https://doi.org/10.1016/j.jallcom.2019.151992

Vancouver

Mingo B, Mohedano M, Blawert C, del Olmo R, Hort N, Arrabal R. Role of Ca on the corrosion resistance of Mg–9Al and Mg–9Al–0.5Mn alloys. Journal of Alloys and Compounds. 2019 Nov 30;811:151992. doi: 10.1016/j.jallcom.2019.151992

Bibtex

@article{86b03078946e4e89b92af3cbf9d17f24,
title = "Role of Ca on the corrosion resistance of Mg–9Al and Mg–9Al–0.5Mn alloys",
abstract = "The effect of Ca additions on the microstructure and corrosion resistance of Mg–9Al and Mg–9Al-0.5Mn alloys is investigated. Model alloys were used instead of a commercial AZ91 alloy in order to avoid masking effects from other alloying elements. Grain size and secondary phases were characterised with special interest in their Volta potential. Corrosion performance was evaluated by hydrogen evolution and electrochemical methods. A synergetic effect was found when Ca and Mn were added in small amounts (0.5 wt%), reaching corrosion rates up to two orders of magnitude lower than the model Mg–9Al alloy. Such improvement was associated with Ca decreasing the Volta potential of the β-phase and with Ca and Mn decreasing the galvanic activity of Fe-rich intermetallics. Precipitation of Al2Ca decreased the amount of β-phase and had a negative impact on the corrosion resistance due to its cathodic behaviour.",
keywords = "Alloying, Calcium, Corrosion, Magnesium, Manganese, Volta potential, Engineering",
author = "Beatritz Mingo and M. Mohedano and C. Blawert and {del Olmo}, R. and Norbert Hort and R. Arrabal",
year = "2019",
month = nov,
day = "30",
doi = "10.1016/j.jallcom.2019.151992",
language = "English",
volume = "811",
journal = "Journal of Alloys and Compounds",
issn = "0925-8388",
publisher = "Elsevier B.V.",

}

RIS

TY - JOUR

T1 - Role of Ca on the corrosion resistance of Mg–9Al and Mg–9Al–0.5Mn alloys

AU - Mingo, Beatritz

AU - Mohedano, M.

AU - Blawert, C.

AU - del Olmo, R.

AU - Hort, Norbert

AU - Arrabal, R.

PY - 2019/11/30

Y1 - 2019/11/30

N2 - The effect of Ca additions on the microstructure and corrosion resistance of Mg–9Al and Mg–9Al-0.5Mn alloys is investigated. Model alloys were used instead of a commercial AZ91 alloy in order to avoid masking effects from other alloying elements. Grain size and secondary phases were characterised with special interest in their Volta potential. Corrosion performance was evaluated by hydrogen evolution and electrochemical methods. A synergetic effect was found when Ca and Mn were added in small amounts (0.5 wt%), reaching corrosion rates up to two orders of magnitude lower than the model Mg–9Al alloy. Such improvement was associated with Ca decreasing the Volta potential of the β-phase and with Ca and Mn decreasing the galvanic activity of Fe-rich intermetallics. Precipitation of Al2Ca decreased the amount of β-phase and had a negative impact on the corrosion resistance due to its cathodic behaviour.

AB - The effect of Ca additions on the microstructure and corrosion resistance of Mg–9Al and Mg–9Al-0.5Mn alloys is investigated. Model alloys were used instead of a commercial AZ91 alloy in order to avoid masking effects from other alloying elements. Grain size and secondary phases were characterised with special interest in their Volta potential. Corrosion performance was evaluated by hydrogen evolution and electrochemical methods. A synergetic effect was found when Ca and Mn were added in small amounts (0.5 wt%), reaching corrosion rates up to two orders of magnitude lower than the model Mg–9Al alloy. Such improvement was associated with Ca decreasing the Volta potential of the β-phase and with Ca and Mn decreasing the galvanic activity of Fe-rich intermetallics. Precipitation of Al2Ca decreased the amount of β-phase and had a negative impact on the corrosion resistance due to its cathodic behaviour.

KW - Alloying

KW - Calcium

KW - Corrosion

KW - Magnesium

KW - Manganese

KW - Volta potential

KW - Engineering

UR - http://www.scopus.com/inward/record.url?scp=85071388560&partnerID=8YFLogxK

UR - https://www.mendeley.com/catalogue/48f451a0-61ea-388b-9379-10ef3b4ea5f0/

U2 - 10.1016/j.jallcom.2019.151992

DO - 10.1016/j.jallcom.2019.151992

M3 - Journal articles

AN - SCOPUS:85071388560

VL - 811

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

SN - 0925-8388

M1 - 151992

ER -

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DOI

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