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Deposition of layered double hydroxides (LDH) on metal surfaces, especially Mg alloys, is considered a promising approach for protective conversion surface treatments. For Mg materials, the formation of LDH coatings on the surface is carried out in an autoclave at elevated temperature or in solution. MgFe-based LDH coatings may find application in medicine. However, their issues are poorly described. In this paper, the growth of MgFe LDH conversion coatings on AZ31 magnesium alloy is described. In this study, MgFe LDH coatings were prepared on hydrothermally treated AZ31 Mg alloy. The morphology was characterized by scanning electron microscopy (SEM). The chemical and phase composition was determined by X-ray diffractometry (XRD) and energy dispersive X-ray spectroscopy (EDS). Two-step synthesis at laboratory temperature was performed. First, a FeOOH layer with a thickness of about 2 µm was prepared at room temperature. While at higher temperature (60 °C), a Fe3O4 layer with a thickness of about 0.7 µm is formed. These FeOOH and Fe3O4 layers are transformed to form MgFe LDH in the second step when reacted in 0.1 M magnesium nitrate for 12 h. The thickness of the resulting MgFe LDH layer ranged from 0.5 to 1.5 µm. The results suggest that this synthesis method leads to the synthesis of non-traditional LDH coatings that can improve the corrosion and bioapplication behavior of Mg materials.
Keywords: AZ31, Magnesium alloy, Hydrothermal treatment, MgFe LDH© This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.