Abstract
In this study, AZ31 Mg alloys with added Ca and Ce were produced by low pressure die casting and were rolled at 400°C. The corrosion properties of the materials were determined by immersion test for 72 hours at a 3.5% NaCl solution. The microstructure of the samples was investigated by light optical microscopy (LOM) and scanning electron microscopy (SEM) before the corrosion test. Twins, dynamic recrystallization (DRX), and the alloying elements have an important role in imparting the final corrosion resistance of the investigated materials.
Highlights
Because of their low density and high specific strength, magnesium alloys have received great interest as structural materials for applications in the automotive and aerospace industries [1]
The Ce is more electronegative than Mg to compound with Al which results in more stable corrosion phase while non-homogeneously distribution of Mg17Al12 could be replaced by Ce-Al including secondary phases mostly showing regular shapes on grain boundaries [6, 7]
To improve the commercially widespread Mg alloy of AZ31, Ca and Ce elements were added to the composition and hot rolling was utilized to get finer grains and homogeneous secondary phases on the microstructure
Summary
Because of their low density and high specific strength, magnesium alloys have received great interest as structural materials for applications in the automotive and aerospace industries [1]. To get finer grains, rolling is especially utilized to form the billet from high thickness to thin sheets. The secondary phases of Mg17Al12 are the second cathodic corrosion contributor for Mg alloys finer formed and non-homogenous distributed inside the matrix and on grain boundaries [2]. The Ce is more electronegative than Mg to compound with Al which results in more stable corrosion phase while non-homogeneously distribution of Mg17Al12 could be replaced by Ce-Al including secondary phases mostly showing regular shapes on grain boundaries [6, 7]. To improve the commercially widespread Mg alloy of AZ31, Ca and Ce elements were added to the composition and hot rolling was utilized to get finer grains and homogeneous secondary phases on the microstructure. To understand the Ce contribution on the corrosion resistance of AZ31 LOM, and SEM characterization methods were used
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