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.
On the copper substrate the DLC films is preparated by plasma elcctrodeposition in methanol aqueous solution. The plating solution composition: alcohol water proportion is 4:1, the additive KCl content is 3g/L and the AlCl3 is trace amounts. The influence of the current density and the electrode spacing to the electrode surface bubble zone thickness, uniformity and stability are discussed in the article. The film surface morphology is observed by scanning electron microscopy (SEM). The thickness of the film D=30, 350, 410 and 380 nm. The deposition rate K=150, 175, 205 and 190 nm/h. The polycrystalline structure of the film can be observed through the X-ray diffraction (XRD) pattern., the characteristic peak of the (111),(200) and (220) crystal plane are observed at 2θ= 43.9°,50.9°and75.3°. The high carbon content is observed by EDX analysis.
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