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Helma Sadat Bahari,Hadi Savaloni 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.11
In this work we report attempts to inhibit corrosion of Cu substrates in 0.6 M NaCl solution by coating with 100 nm Ni filmand post-annealing with oxygen at different temperatures, in order to convert the nickel to nickel oxide. Electrochemicalimpedance spectroscopy (EIS) and polarization measurement analyses were used to obtain electrochemical data. The correctnessof the EIS results was confirmed by Kramers–Kronig transformation, while fitting of the data (Nyquist and Bodediagrams) to suitable equivalent electrical circuits showed that the highest corrosion enhancement is achieved for the Ni/Cusample annealed at 473 K, resulting in a 98% corrosion inhibition enhancement factor (η%). Polarization measurements alsoshowed that this sample has the lowest corrosion current density, lowest corrosion rate and highest corrosion potential witha 97% corrosion inhibition efficiency factor (PE%). Consistent results are achieved for EIS and polarization measurementswhich are then correlated with the nanostructure of the films using X-ray diffraction and atomic force microscope analyses.