| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1606436 | Journal of Alloys and Compounds | 2016 | 10 Pages |
•Functionally graded structures have been synthesized using adjusting pulse parameters.•Al2O3 and W contents increases gradually as a function of coating thickness.•Alumina increased the corrosion resistance by moderating icorr and Ecorr.•Wear behavior has been enhanced in functionally graded structure.
Electrodeposition of functionally graded (FG) Ni–W–Al2O3 nanocomposite coatings is investigated in current research. These types of coatings were applied in a way that alumina content was increased from the substrate towards the surface of the coating; hence, Ni–W would possess improved wear and corrosion resistance properties. FG-coatings were developed by the variation of duty cycle and frequency. The microstructure and elemental analysis of the coating as a function of thickness was investigated using scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS) analysis, respectively. The corrosion resistance of the FG-coatings was evaluated using potentiodynamic polarization and the wear behavior was also studied using pin-on-disk wear tests. In order to investigate hardness properties of the coating, microhardness measurements were carried out on cross-section of coatings. Results revealed that the alumina content and the microhardness increased towards the surface. Results also showed the corrosion and wear resistance of FG-coatings were significantly improved by addition of α-Al2O3 nanoparticles. Profilometery and AFM results also revealed that surface roughness was influenced by pulse plating parameters.
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