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Long term wet corrosion resistance of metals depend s o the stability of their corrosion product layer. With immersion corrosion tests, such stability can be predicted. EIS and potentiodynamic polarization were complemented with XPS to investigate the characteristics of Ni corrosion product layer forme d after 1 hr. and 72 hr. immersion in 3.5% NaCl solution. Two time constants with decreas ing Nyquist semi-circle size and phase angle maxima, based on EIS characterization d uring the immersion times, indicated the formation of an increasingly porous a nd less adherent corrosion product layer. The product formation shifted the Ni corrosi on potential more negatively and increased cathodic and anodic current densities, du ring potentiodynamic polarization. XPS characterization suggested that a rapid nucleat ion of NiO could increase H 2O adsorption, subsequently triggering the formation o f different forms of Ni(OH) 2 in the corrosion product layer. Consequently, the corrosio n resistance of the Ni coating decreased after 72 hr. immersion in 3.5% NaCl solut ion.

Ni Corrosion Product Layer During Immersion in a 3.5% NaCl Solution: Electrochemical and XPS Characterization