Corrosion Resistance and Hardness Properties of Electrodeposited Ni-Fe Composite Coatings Containing Al2O3-TiO2 Particles

Electrodeposited Ni-Fe composite coatings containing ceramic particles have been investigated due to their improved mechanical and corrosion resistant properties over plain Ni-Fe alloy coatings. In the present study, Ni-Fe/Al2O3-TiO2 coatings have been electrodeposited using physically mixed commercial Al2O3 and TiO2 powders with different powder compositions of 80 TiO2-20Al2O3, 50 TiO2-50Al2O3, and 20 TiO2-80 Al2O3. The effect of composition on the properties of the coatings was examined. Field Emission Scanning Electron Microscopy (FESEM) and Energy Dispersive X-ray Spectroscopy (EDS) were used to analyze the surface morphology and chemical composition of coatings. X-Ray Diffraction analysis was used to determine the crystalline structure of the coatings. The electrochemical behavior of coatings was studied by polarization test in 3.5 wt-% NaCl solution. Finally, the hardness of the prepared coatings was measured by Vickers microhardness testing instrument. Results revealed that increase in TiO2 reinforcement particles increased the hardness and corrosion resistance of the composite coatings.

Keywords:

Electrodeposition , composite , Al2O3 , TiO2 , FESEM , corrosion