In acid copper sulphate solution , the nc copper has a more negative corrosion potential which is decreasing with reducing the grain size and diffusion impedance was only found in the as - prepared and as - annealed at 180 ? nc copper due to the diffusion within the pores and channels on the surface . both the tafel plots and eis study demonstrated that the nc copper exhibits a higher corrosion current and lower polarization resistance than its mc couterpart 在酸性硫酸銅溶液中,納米晶銅的腐蝕電位比微米晶銅要負,并且隨著晶粒尺寸的減小而降低。 eis研究表明,未退火的和180退火的納米樣品中發現了擴散阻抗,與表面孔洞和通道中的擴散有關。極化曲線外推法和電化學阻抗研究都表明納米晶銅的腐蝕電流比微米晶銅高,而極化電阻要低。