Abstract
The hypoeutectic Al-10 Mg 2 Si (wt%) composites, also denoted as Al-6.3Mg-3.7Si (wt%) alloy, were cast in a steel step mould, in which different solidification rates were obtained. The microstructural characterizations were made by optical microscope and XRD. Corrosion performances were measured by immersion and electrochemical corrosion tests in 3.5% NaCl solution. Microstructure analysis showed that all the alloys consisted of a -Al, Chinese script type Mg 2 Si and needle-like Al 5 FeSi phases. Increasing solidification rate resulted in a remarkable refinement of Chinese script-like eutectic Mg 2 Si phases. Corrosion tests revealed that increasing solidification rate improved the corrosion resistance of Al-10Mg 2 Si composites due to the more uniform distribution of Mg 2 Si phases and the stabilization of protective oxide films on the sample surface.
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