Abstract
Severe plastic deformation such as surface mechanical attrition treatment (SMAT) transfers surface layer of metallic material into ultra-fine-grain. In this work commercially cold rolled copper plate subjected to SMAT for different time 10, 20, 30, 60 and 120 min. Significant variation of crystallite size, lattice strain and stored energy along different crystallographic planes was estimated from X-ray diffraction (XRD) with initial orientation during the SMAT process. Through the SMAT process stored energy increased while lattice parameter decreases with treatment time. The corrosion behavior of SMAT copper were comparatively investigated by electrochemical methods in 5 wt% NaCl solution. Mechanical surface treatment processes have a great influence on the surface which increase surface activities consequently improve the corrosion resistance of metal. SMAT process enhance the corrosion resistance of copper surface resulting from oxide layer growth at the treated surface. Higher impedance and lower corrosion current were observed after SMAT. The hardness (Hv) increased with increasing SMAT time and tends to be stable after 30 min of treatment. The hardness and corrosion rate values were strongly related to the samples crystallographic planes orientation.
Published Version
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