《Table 5 Corrosion potential (φcorr) and corrosion current density (Jcorr) of samples A, B, C and D

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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 13 shows the potentiodynamic polarization curves for samples A，B，C and D in 0.5 wt.%H2SO4solution，withthecorrespondingelectrochemical parameters listed in Table 5.The corrosion behavior is quite different from that in NaOH or NaCl solution as there is no passivation phenomenon.Theφcorr shifts positively from-0.39 to-0.15 V，whilst the Jcorr decreases from 31.18 to 15.80μA/cm2 with increasing the grain size in the sample.It is clear that the smaller the grain size is in the sample，the more the grain boundaries are and the lower the corrosion resistance is，withou passivation.This will increase the electrochemica reactivity and accelerate the corrosion of Ni[34].