Abstract
To improve the wear and corrosion resistance of magnesium alloy, a multifunctional organic/inorganic hybrid coating was prepared on AZ31 magnesium alloy by microarc oxidation and vapor deposition of Polyp-xylene (MAO-PPX). Electrochemical tests show that the MAO-PPX composite coating can effectively block the corrosive medium and improve the corrosion resistance of magnesium alloy. Long-term corrosion protection was confirmed by neutral salt spray tests at 35 °C with 5 wt% NaCl. In addition, the MAO-PPX composite coating demonstrated a much lower friction coefficient which could be attributed to the polyp-xylene filled in the micropores of the MAO layer and transferred on the counterpart sphere. This composite coating with excellent anti-corrosion and decent lubricating properties has broad application prospects in surface protection of magnesium alloys.
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