Effect of type of current, pulse parameters and addition of titania nano-particles on corrosion properties of Ni-Fe coating

In this study, pulse electrodeposition of Ni-Fe coating in sulphate bath was performed and effects of pulse parameters on corrosion properties were investigated. Field Emission Scanning Electron Microscopy (FESEM) was used to study the morphology of coatings. The chemical composition of deposits was examined by Energy Dispersive X-ray Spectroscopy (EDS) attached with Scanning Electron Microscopy and Atomic Adsorption Spectroscopy (AAS). Corrosion testing of coatings by potentiodynamic polarization in solution 3.5% NaCl was investigated. With pulse current technique, corrosion resistance of Ni-Fe coating increased. In Ip=20 (mA/cm2) and f=10 (Hz) corrosion current of coating received to 0.3 (μA/cm2). With varying the duty cycle at duty cycle of 25%, corrosion current of 0.19 (μA/cm2) obtained. Incorporation of 2.59 (At%) TiO2 in Ni-Fe matrix increased the corrosion current of deposit.