Abstract
To control the corrosion resistance of magnesium (Mg) alloys in physiology environment, a composite coating composed of fluoridated hydroxyapatite (FHA) and poly-lactic acid (PLA) was fabricated on micro-arc oxidated (MAO) AZ91D alloy via combination electrochemical deposition and dip coating methods (Mg@MAO@FHA@PLA). Then these samples were subjected to different heat treatment. The influence of heat treatment on morphology, phase structure, bonding strength and static contact angle of Mg@MAO@FHA@PLA was investigated. The results of electrochemical test and immersion test in simulated body fluid (SBF) show that the corrosion resistance of Mg@MAO@FHA@PLA with heat treatment is further improved. The sample with melting and annealing duplex treatment has the best corrosion resistance and its corrosion rate is 5.574 × 10−5 mm/yr. At the end of 21 days immersion tests, it has lower hydrogen evolution and pH is still less than 7.60. These results indicate that Mg alloy coated with MAO, FHA and PLA coatings is a promising candidate as orthopedic implants.
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