The Effect of Shot Peening Duration on Corrosion Properties of Magnesium Alloy AZ91 in 3.5% NaCl Solution

This report analyzed AZ91 Mg alloy by shot peening and the corrosion and mechanical properties in the surface area under extreme plastic deformation. Studies into the effect of shot peening on AZ91 Mg alloy at various periods have shown that the mean stiffness of the shot samples improved over time to 80.8HV and achieved 105.6HV at 60 min. The maximum level of the stiffness strength of the samples was also assessed based on their stiffness level following analysis of the samples, and the maximum power of exhaustion with a growing shot peening period was found to have dramatically positive alterations. Moreover, the surface corrosion value reduced substantially over time. The corrosion level in the sample As-received rose by 21.495% of the original weight and reached 3.087% with a shot peening time improvement (60 min for sample). Besides, in general, the yearly sample corrosion level was diminished in such a way that the original sample decreased from 50,091.71 mm/year in 60 min to 13,067.40 mm/year. α-Mg did not shift according to the XRD model; however, β-phase has vanished as the shot peening period increased. The examination of samples was conducted through scanning electron microscopy images. This has shown that the samples’ surface is flattened by mechanical activity and enhancing the processing time. It minimized contact with a corrosive medium on the sample’s surface. The degree of corrosion has also been lowered in this situation. © 2021, The Institution of Engineers (India).