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Effect of Secondary Phase on the Corrosion Behavior of Mg–Ca and Mg–Zn Binary Alloys

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In this study, the influence of secondary phase Mg2Ca and MgZn on the corrosion behavior and its relationship with solidification behavior of Mg–2.5Ca and Mg–2.5Zn were investigated. Microstructural evolutions were characterized by optical microscopy, X-ray diffraction, scanning electron microscopy and energy dispersive X-ray spectroscopy. Solidification behavior was assessed via two thermocouple thermal analysis method. The corrosion resistance was examined in vitro by potentiodynamic polarization in Kokubo solution at room temperature. Potentiodynamic polarization test results revealed better corrosion behaviour of Mg–2.5Zn compared to the Mg–2.5Ca alloy. The formation of galvanic cell between Mg2Ca and Mg matrix has destructive effect compared to the evolution of MgZn and Mg matrix couple. Thermal analysis results showed that the fraction of primary D-Mg at dendrite coherency point (fs DCP) in Mg–2.5Ca alloy about 3% more than that of similar alloy with Zn content. In addition, coherency temperature (T DCP) and time (T DCP) for Mg–2.5Ca occurred at 631 °C and 121 s respectively. These values decreased to 611 °C and 80 s for Mg–2.5Zn alloy.
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Document Type: Research Article

Publication date: September 1, 2013

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