Study of corrosion resistance and nanostructure for tertiary Al2O3/Y2O3/CNT pulsed electrodeposited Ni based nanocomposite.

Electrodeposition of nickel based tertiary Al₂O₃/Y₂O₃/CNT nanocomposites by using pulsed current has been studied in this investigation. The coating process has been performed in a nickel sulphate bath and the nanostructure of the obtained compound layer was examined with high precision figure analysis of SEM nanographs. The effects of process variables, i.e. Y₂O₃ concentration, treatment time, current density and temperature of electrolyte have been experimentally studied. Statistical methods were used to achieve the minimum corrosion rate and average size of nanoparticles. Finally the contribution percentage of different effective factors was revealed and a confirmation experiment has shown the validity of the obtained results. In addition, it has been revealed that by changing the size of nanoparticles, the corrosion properties of coatings will change significantly with this trend. Atomic force microscopy and transmission electron microscopy analyses have confirmed the smooth surface and average size of nanoparticles in the optimal coating. [ABSTRACT FROM AUTHOR]