Microstructure and Properties of Electrodeposited nc-TiO2/Ni–Fe and Ni–Fe Coatings

P. Ledwig; T. Ratajski; P. Indyka; I. Kalemba‑Rec; A. Kopia; M. Kąc; B. Dubiel

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자료유형: 학술저널

저자정보: P. Ledwig (AGH University of Science and Technology) T. Ratajski (AGH University of Science and Technology) P. Indyka (Jagiellonian University) I. Kalemba‑Rec (AGH University of Science and Technology) A. Kopia (AGH University of Science and Technology) M. Kąc (Polish Academy of Sciences) B. Dubiel (AGH University of Science and Technology)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.26 No.6

발행연도: 2020.1

수록면: 812 - 826 (15page)

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In this study, nc-TiO2/Ni–Fe composite coatings, and Ni–Fe alloys as equivalents to their matrices, were obtained from citratesulphatebaths in the electrodeposition process using direct current and pulse current conditions. The aim of the study was toexamine the effects of TiO2nanoparticles and current conditions on the chemical composition, surface morphology, microstructure,microhardness and magnetic properties of the electrodeposited coatings. The results show that the concentrationof Fe in Ni–Fe alloys is related to the current conditions and is higher in the case of pulse current electrodeposition, whilesuch a relationship was not observed for composites. The reinforcement of composites with TiO2nanoparticles results in amore developed surface topography with many nodule-like structures. Composites and equivalent alloys deposited in pulsecurrent are characterized by a finer grain size than those obtained in direct current. TiO2nanoparticles and their agglomerates,several tens of nanometres in size, are distributed randomly in the Ni–Fe matrix of composites deposited in both currentconditions used. Incorporation of a high volume fraction of nc-TiO2, exceeding over a dozen percent, and decreasing thenanograin size in nc-TiO2/Ni–Fe composites electrodeposited under pulse current conditions, allow a higher hardness to beachieved than in their counterparts obtained using direct current. Magnetic measurements showed ferromagnetic orderingof pristine TiO2nanoparticles, however, the introduction of TiO2nanoparticles into the Ni–Fe matrix resulted in a decreasein coercivity and saturation magnetization.

#TiO2/Ni–Fe composites · Electrodeposition · Nanostructure · Microhardness · Magnetic properties

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