Abstract
Effect of magnesium-to-phosphate (M/P) ratio on the corrosion resistance of magnesium alloys embedded in magnesium phosphate cement pastes was studied via electrochemical methods and surface characterizations in this study. Results show that corrosion resistance of magnesium alloy increased with the increased M/P ratio. pH played a dominant role in protective capability of oxide film formed on magnesium alloy. M/Ps 7 and 12 leads to formation of oxide film mainly consisting of magnesium phosphates. In contrast, an oxide film composed of magnesium and aluminium oxide/hydroxide formed in M/P 17, possibly with adsorption of phosphate ions which further enhances the corrosion resistance.
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