Effect of indium coating on corrosion behavior of AZ31 Mg alloy by DC sputtering

The corrosion behavior of annealed AZ31 Mg alloy was studied in simulated body fluid (SBF) by electrochemical technique to investigate the role of coating with Indium by DC sputtering without and with oxygen. The coating by (In) in absence of oxygen enhances the stability of the corrosion product as MgO through reducing the corrosion current density. While the presence of oxygen during coating accelerates the corrosion rate due to increasing the cathodic polarization through the reduction of oxygen and then increasing the dissolution of Mg from the substrate. The coating by (In) gave protection efficiency reach to (21.008%). While the presence of oxygen during DC sputtering promotes the cathodic area on grains as (In2O3) leading to localize the corrosion around the AlMn phases at the grain boundaries. The uncoated and coated surfaces were examined by XRD analysis and SEM images.Copyright (c) 2022 Elsevier Ltd. All rights reserved.Selection and peer-review under responsibility of the scientific committee of the International Conference on Materials, Processing & Characterization.