Effect of plastic deformation on Corrosion of cadmium in 0.1 m sodium Sulphate solution

Abstract

The present investigation was carried out to study the influence of prior plastic deformation and surface finish on the corrosion behaviour of pure cadmium in 0.1 M Na2SC>4 solution at 25° C. Cylindrical specimens were deformed by compression to different levels of deformation up to 90% reduction in height (RH). Three surface finishes were examined, namely, 120, 320 and 600 grits. The results obtained indicate that the cathodic corrosion rate decreases with deformation up to 30-60% RH, depending on the surface finish. Further deformation tends to increase the corrosion rate. This behaviour is related to microstructure changes and dynamic recrystallization due to plastic deformation prior to corrosion testing. Relatively higher corrosion rates were observed for coarser surface finishes.