Abstract
In this work, the green chemistry conversion coating on AZ31 magnesium alloy surface was made and studied by means of Ce (SO4)2·2(NH4)2SO4·4H2O and MnSO4 as inhibitor, H2O2 as oxidant, NaCl as accelerator, CH3COOH as stabilizer. The coating was evaluated in simulated body fluid (SBF) with pH=7.4 at 37°C by using electrochemical impedance spectroscopy (EIS). The results show the conversion coating resistance, for the untreated or treated alloy, is 0.75 kΩ·cm2 and 3.28 kΩ·cm2 respectively. It indicates the conversion coating treated surface presents better corrosion behaviour in SBF than the original material surface. The morphologies and composition the coating were examined by scanning electron microscopy (SEM) and energy dispersive spectrometry (EDS) respectively. The result indicates that the Ce-Mn conversion coating was made on magnesium alloy surface. Biocompatibility of conversion coating was investigated by use of cell toxicity. Cell culture has shown that the magnesium alloy has good cytocompatibility.
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