The anodic behavior of Nickel 200 (99.5 percent) and Nickel 270 (99.97 percent) in 1 N H2SO4 was studied galvanostatically and potentiostatically by both continuous and pulse polarization techniques. Open circuit differential capacitances were 31 ± 2 μ farad/cm2 for Ni 200 and 23 ± 1 μ farad/cm2 for Ni 270. Anodic Tafel slopes of 48 and 50 mv were obtained with pulse galvanostatic polarization for Nickel 200 and 270. Pseudo-passivation and secondary passivation phenomena were observed. Results indicate that the passivation parameters can be determined equally well with either continuous or pulse polarization.

Subject
Films, Electrochemical cells, Potentiostatic polarization, Capacitance, Current densities, Film formation, Passivation, Nickel, Polarization, Tafel slope, Electrodes, Rest potential, Electrode potential
© 1966 National Association of Corrosion Engineers
1966
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