Journal
MATERIALS AND CORROSION-WERKSTOFFE UND KORROSION
Volume 67, Issue 7, Pages 702-709Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/maco.201508609
Keywords
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Funding
- National Science Foundation of China [51305036]
- Beijing Municipal Natural Science Foundation [3152011]
- Graduate innovation project of Beijing Institute of Petrochemical Technology [15033981002/159]
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Magnesium and its alloys have shown great potential as promising biodegradable implantation materials. However, rapid biodegradation has limited them to clinical applications. To overcome this disadvantage, a Ca/P coating was formed on AZ31B magnesium alloy by micro-arc oxidation (MAO) in three different electrolytes with and without hydroxyapatite (HA). The surface properties were determined by scanning electron microscope (SEM), X-ray diffraction (XRD), and micro-hardness tester. Immersion tests, potentiodynamic polarization, and electrochemical impedance spectroscopy (EIS) tests were employed to evaluate the corrosion behavior of MAO coatings on AZ31B magnesium alloy in simulated body fluid (SBF). The results revealed that the pore size and the micro-hardness would be changed by the different electrolytes. The electrochemical corrosion tests show that the sample prepared in the electrolyte containing 4 g/L edetate calcium disodium (C10H12N2O8CaNa2 center dot 2H(2)O, EDTA-Ca), 1.5 g/L sodium hexametaphosphate (NaPO3)(6), 2 g/L sodium hydroxide (NaOH), and 15 g/L sodium metaaluminate (NaAlO2) with 1.5 g/L HA has the smallest corrosion current density and the largest electrochemical impedance.
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