《Table 2 Equivalent circuit parameters determined by modeling impedance spectra of samples A, B, C a

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《具有均匀和双峰晶粒尺寸分布的电沉积镍的腐蚀行为（英文）》

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Figure 9 shows the potentiodynamic polarization curves for as-deposited sample A and heat-treated Ni samples B，C and D in 10 wt.%NaOH solution，respectively.It is immediately apparent that all samples show a typical active-passive-transpassive corrosion behavior，which is related to the formation of Ni（OH）2passive film according to the previous reports[20，32].The corresponding electrochemical parameters extracted from the polarization curves are summarized in Table 1.The corrosion potential shifts negatively from-0.35 to-0.55 V and the corrosion current density increases from0.46 to 3.85μA/cm2 for samples from A to D.These results indicate that the corrosion resistance of the sample decreases with increasing grain size，which is consistent with reported work[12].