Abstract
Effects of secondary phases on corrosion behaviour of the Mg–0.5Ca–xZn alloys were investigated by polarization, immersion and hydrogen evolution tests. The Mg2Ca phase nucleated at 520°C while, Ca2Mg6Zn3 and Mg51Zn20 phases were formed at 420°C and 330°C respectively. The corrosion resistance of Mg–0.5Ca alloy was enhanced with the addition of Zn up to 1%, while further addition reversed the effect. The Mg–0.5Ca–1Zn alloys with (α-Mg+Ca2Mg6Zn3+Mg2Ca) phase showed lower corrosion rate than the alloys with (α-Mg+Ca2Mg6Zn3) and (α-Mg+Ca2Mg6Zn3+Mg51Ca20) phases. The amount of corrosion product, composed of Mg(OH)2 and hydroxyapatite on the surface of the alloy, increased with increasing Zn content.
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