Abstract
The ultrasonic shot peening (USSP) treatment formed a nanocrystalline surface layer and a gradient microstructure of 200 μm depth. Corrosion test of the USSP treated and certain layers of surface materials being removed by polishing was performed. It was found exfoliated Fe particles during USSP increased the corrosion rate. The Fe particles provided more cathodic reaction sites during the corrosion process, leading to an obviously increased current density of the cathodic reaction. The nanocrystalline resulted in a fast formation of protective film and the high density of grain boundary acted as an effective corrosion barrier, which reduced the current density of the anodic reaction. The work provides an efficient way to investigate the effect of grain size and other factors on the corrosion resistance by measuring the corrosion rate of the gradient nanostructure along the depth.
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