Abstract
The fabricated Mg–Al alloy consists of α-Mg phase and Mg–Mg17Al12 eutectic phase. The corrosion behavior of cast Mg–Al alloy in sulphuric acid (H2SO4) and acetic acid (HAc) aqueous solutions was investigated. The Mg–Al alloy shows general corrosion in H2SO4 solution, and the α-Mg dendrites revealed a slightly faster corrosion rate than that of the eutectics. In HAc solution, the alloy shows an obvious selective corrosion characteristic, with the α-Mg dendrites being corroded preferentially. Grain orientation plays an important role in corrosion behavior of the alloy in the HAc solutions.
Highlights
Magnesium and its alloys have attracted huge interest as engineering materials for industry and electronics applications because of their low density and good mechanical properties [1,2,3]
For the reasons stated above, the Mg–Al alloy was fabricated in this investigation, consisting of α-Mg dendrites and Mg–Al eutectics
A Mg–Al alloy was fabricated in this investigation and composed of α-Mg dendrites and eutectics
Summary
Magnesium and its alloys have attracted huge interest as engineering materials for industry and electronics applications because of their low density and good mechanical properties [1,2,3]. The role of the Al element has been addressed, and it has been shown that the anti-corrosion ability of Mg alloys is clearly improved when the Al content reaches 10 wt% [20] In both the (Mg–Al–Mn) AM and (Mg–Al–Zn) AZ series of alloys, β-Mg17 Al12 and Al–Mn phases are the most common second phases. There is a common phase, Mg–Al eutectic, which, its content is low, has a vital influence on the anti-corrosion behavior of the AZ and AM series of alloys. The corrosion behavior in weak acid solutions, for example, acetic acid (HAc), for the Mg–Al alloys has rarely been reported up to now For these reasons, HAc was selected as a corrosive solution in the investigation so that some novel experimental phenomena might be present
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