Corrosion resistance behavior of gradient microstructure induced by punching deformation and recover

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In this study,the gradient grain induced by punching deformation and recovery treatment on a cupronickel alloy surface sample were investigated,and their effects on corrosion resistance were measured by atom force microscopy (AFM),X-ray diffraction (XRD),electrochemical measurement,electron work function (EWF),and contact electrical resistance (CER).The cupronickel alloy surface experienced punching deformation for 60 min and recovery at 300 ℃ for 1 h to produce gradient surface.The grain size measured by XRD is bigger than that measured by AFM,due to X-ray intensity of 95 % produced at the depth of 12-20 μm for the crystal planes of (111),(200),and (220).The gradient grain surface,compared to the original surface,shows a 13.7-fold decrease in passivation current density (ip),and corrosion potential (EC) increases by approximately 9.8 %.These results are attributable to the increase in EWF and formation of passivation film with better adhesion and compactness after treatment.
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