Abstract
The natural surface films on Mg alloys can’t provide enough corrosion protection in aqueous solutions compared to those on Al alloys and Ti alloys. In this study, a strategy is proposed for corrosion protection of Mg alloys by transforming corrosion products into protective coatings. Here, a magnesium-neodymium alloy is immersed in potassium dihydrogen phosphate solution at 50 °C for 4 h. Following this simple corrosion process, a layer of uniform MgHPO4.3 H2O coating with a thickness of about 20 µm is formed on the Mg alloy. Electrochemical test and long-term immersion test reveal that this coating significantly improves the corrosion resistance of the Mg-Nd alloy in Cl--containing simulated concrete pore solution. In summary, it indicates that some corrosion products can be designed to be transformed into protective coatings, providing new technical insights pertaining to the corrosion protection of magnesium alloys.
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