Effect of Ca addition on the corrosion behavior of Mg–Al–Mn alloy

Effect of Ca addition on the corrosion behavior of Mg–Al–Mn alloy Article history: The microstructures and corrosion resistance of magnesium–5 wt% aluminum–0.3 wt% manganese alloys Received 10 November 2015 (Mg–Al–Mn) with different Ca additions (0.2–4 wt%) were investigated. Results showed that with increas- Received in revised form 25 January 2016 ing Ca addition, the grain of the alloys became more refined, whereas the corrosion resistant ability of Accepted 30 January 2016 the alloys initially increased and then decreased. The alloy with 2 wt% Ca addition exhibited the best Available online 2 February 2016 corrosion resistance, attributed to the effect of the oxide film and (Mg,Al) Ca phases which were discon- tinuously distributed on the grain boundaries. These phases acted as micro-victims, they preferentially Keywords: corroded to protect the -Mg matrix. The oxide film formed on the alloy surface can hinder the solution Mg–Al–Mn alloy further to protect the -Mg matrix. Ca addition © 2016 Elsevier B.V. All rights reserved. Microstructure Corrosion resistance 1. Introduction added to improve the mechanical properties, oxidation behavior and corrosion resistance of Mg alloys caused by the purification Magnesium (Mg) is the third most abundant element in the effect of these elements on the alloy melt and the role of RE- earth’s crust after aluminum (Al) http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Applied Surface Science Elsevier

Effect of Ca addition on the corrosion behavior of Mg–Al–Mn alloy

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Publisher
Elsevier
Copyright
Copyright © 2016 Elsevier B.V.
ISSN
0169-4332
eISSN
1873-5584
D.O.I.
10.1016/j.apsusc.2016.01.283
Publisher site
See Article on Publisher Site

Abstract

Article history: The microstructures and corrosion resistance of magnesium–5 wt% aluminum–0.3 wt% manganese alloys Received 10 November 2015 (Mg–Al–Mn) with different Ca additions (0.2–4 wt%) were investigated. Results showed that with increas- Received in revised form 25 January 2016 ing Ca addition, the grain of the alloys became more refined, whereas the corrosion resistant ability of Accepted 30 January 2016 the alloys initially increased and then decreased. The alloy with 2 wt% Ca addition exhibited the best Available online 2 February 2016 corrosion resistance, attributed to the effect of the oxide film and (Mg,Al) Ca phases which were discon- tinuously distributed on the grain boundaries. These phases acted as micro-victims, they preferentially Keywords: corroded to protect the -Mg matrix. The oxide film formed on the alloy surface can hinder the solution Mg–Al–Mn alloy further to protect the -Mg matrix. Ca addition © 2016 Elsevier B.V. All rights reserved. Microstructure Corrosion resistance 1. Introduction added to improve the mechanical properties, oxidation behavior and corrosion resistance of Mg alloys caused by the purification Magnesium (Mg) is the third most abundant element in the effect of these elements on the alloy melt and the role of RE- earth’s crust after aluminum (Al)

Journal

Applied Surface ScienceElsevier

Published: Apr 30, 2016

References

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