Structure characterization of electrolytic composite layers on amorphous nickel matrix, containing oxide and metallic components
Magdalena Popczyk, Antoni Budniok Uniwersytet Śląski, Instytut Nauki o Materiałach, ul. Bankowa 12, 40-007 Katowice
Quarterly No. 2, 2005 pages 48-52
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abstract lectrodeposited Ni-P+NiO+W and Ni-P+NiO+Co composite layers were obtained in the galvanostatic conditions (j = = 0.200 A cm−2), at the temperature of 298 K. For comparison the Ni-P+NiO composite layer was also obtained and investigated in the same manner. Metallographic, stereoscopic and scanning microscope with countershaft to X-ray microanalyser and Form Talysurf - type profilograph were used for cross-section and surface characterization of the layers. The phase composition of the layers was performed using a Philips diffractometer and the chemical composition - by the atomic absorption method using a Perkin-Elmer spectrometer. All obtained layers, to characterize a good adhesion to the substrate, mat and rough surface. The surfaces of Ni-P+NiO+W and Ni-P+NiO+Co composite layers are more developed in comparision to Ni-P+NiO composite layer (Figs 1, 2). Surface analysis of distribution of nickel and tungsten in the Ni-P+NiO+W composite layer and nickel and cobalt in the Ni-P+NiO+Co composite layer, show local differentiation of chemical composition of these elements on surface (Figs 3-5). XRD investigations for the Ni-P+NiO+W and Ni-P+NiO+Co layers show in the both cases presence of amorphous structure matrix Ni-P with embedded particles of nickel oxide and tungsten or cobalt (Figs. 6b,c). Introduction of nickel oxide and cobalt through electrolytic embedded into amorphous nickel matrix, causes of obtaining layer about very developed and rough surface (Ni-P+NiO+Co). This obtained composite layer maybe useful as electrode material in electrochemistry, particularly in the process of hydrogen electroevolution. Key words: amorphous nickel matrix, nickel oxide, tungsten, cobalt, composite layers