Variation of adhesive stress in anodized AZ31 magnesium alloy immersed within cement concrete blocks with different solidification times

Abstract

Abstract Anodized AZ31 Magnesium Alloys were synthesized via electrodeposition processes. The aim of this work was to determine the mechanical response of anodized AZ31 Magnesium alloy with different current densities immersed within cement concrete blocks with different solidification times. The anodized alloy was characterized by X-ray diffraction, exhibiting the crystallography orientation for the Mg and MgO phases. Energy-dispersive X-ray spectroscopy was used to determine the chemical composition of the anodized magnesium alloy. Scanning electron microscopy technique was performed to analyze morphological surface changes on the anodized Mg alloy with different current densities. The topography variation evidenced a reduction of the roughness and grain size with the increase of the current density which was determined by atomic force microscopy (AFM). The mechanical properties micro-hardness increased by 32% when the magnesium alloy was anodized with a current density of 25\u202fmA·cm−2. When both anodized magnesium MgO with the higher current density alloys for (1 and 7 days) are compared to metallic Mg alloy AZ31, the adhesive stress between the anodized magnesium MgO with the higher current density and the ceramic paste or cement concrete with a hardening time of 1 day (24\u202fh), exhibited a reduction of 45% and for 7 days the anodized magnesium MgO with the higher current density exhibited a reduction of 60%. This mechanical behavior in the anodized Mg/MgO system indicates that the Mg/MgO coatings can be promising for future applications in the civil construction industry.