Galvanostatic Electrodeposition and Corrosion Characterization of Ni-Co Alloy Thin Films

Shraddha Bais* and R.K. Pathak

Department of Chemistry, Govt. M.L.B. Girls PG College, Indore-452001 (M.P.), INDIA.


Electrodeposited NiCo alloy thin films on mild steel substrate were produced from sulphate baths containing citrate as complexing agent. The thin films were galvanostatically deposited at 2 mA/cm2 for 20 min. The corrosion rate of the films was determined by tafel polarization method in three different corrosive medium i.e. NaCl, HCl and H2SO4. It has been found that Film composed from deposition bath having Ni2+/Co2+ =0.33 showed the highest corrosion resistance. Scanning electron microscopy (SEM) and Energy dispersion X-Ray spectroscopy (EDAX) analysis revealed the morphology and elemental composition of thin films respectively. The XRD analysis confirmed the crystalline nature of thin films.

Keywords :Galvanostatic electrodeposition, thin film, Corrosion rate, XRD, SEM.