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)
Applied Surface Science – Elsevier
Published: Apr 30, 2016
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