Effect of reinforcement content on the properties of Ni-Fe/Al۲O۳-TiO۲ hybrid composite coatings

Electrodeposited Ni-Fe composite coatings containing ceramic particles have been investigated due to their improved mechanical and electrochemical properties over Ni-Fe alloy coatings. In the current study, the electrodeposition route was used for incorporation of physically mixed commercial Al۲O۳ and TiO۲ powders with three different weight percentages of ۸۰TiO۲-۲۰Al۲O۳, ۵۰TiO۲-۵۰Al۲O۳, and ۲۰TiO۲-۸۰Al۲O۳ in Ni-Fe coating. 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 ۳.۵ wt-% NaCl solution. Finally, the hardness of the prepared coatings was measured by Vickers microhardness testing instrument. Results revealed that an increase inTiO۲ and Al۲O۳ contents led to the improvement of the mechanical behaviour and corrosion resistance of the prepared hybrid composite coatings.

Keywords:

Electrodeposition , hybrid composite , NiFe , corrosion behavior