RELATION STUDY OF DIFFERENT PROPERTIES FOR TERTIARY PULSED ELECTRODEPOSITED Ni-BASED NANOCOMPOSITE WITH Al₂O₃/Y₂O₃/CNT NANOPOWDERS

Abstract

Electrodeposition of tertiary alumina/yttria/carbon nanotube (Al₂O₃/Y₂O₃/CNT) nanocomposite by using pulsed current has been studied in this investigation. Coating process has been performed on nickel sulphate bath and nanostructure of obtained compound layer is examined with high precision figure analysis of SEM nanographs. The effects of process variables, i. e. Y₂O₃ concentration, treatment time, frequency and duty cycle, have been experimentally studied. Statistical methods are used to achieve the minimum of corrosion rate and average size of nanoparticles. Finally the contribution percentage of different effective factors is revealed and confirmation run shows the validity of obtained results. Also it has been revealed that by changing the size of nanoparticles, corrosion properties of coatings will change significantly in the same trend. AFM and TEM analyses have confirmed smooth surface and average size of nanoparticles in the optimal coating.