Unraveling the role of micro-arc oxidation process factors on the corrosion resistance of magnesium alloy microtubes

This study employed Micro Arc Oxidation (MAO) to coat ceramic-based coating on fabricated microtubes for biological applications. Although there is information on the MAO coating of sheets and plates, there is relatively little technical information on applying the MAO method to tubes. The impact of crucial MAO process parameters such as current density, inter-work distance, and coating time on the microstructure, porosity, and corrosion resistance of MAO coating deposit on friction stir back extrusion magnesium alloy microtube was studied. The central composite rotatable design was used to conduct experimental runs involving three parameters, modified at three distinct levels. According to the design matrix, cross-sectional images of MAO-coated magnesium microtube were used to quantify interface microstructure . The porosity and corrosion resistance of coated microtubes were tested in a simulated body fluid environment, and the results were connected with process variables using an empirical connection. The usage of MAO coating has been found to have promising outcomes in extending life, lowering corrosion degradation rates, and improving mechanical integrity.