Electrodeposition of Co-Ni and Co-Ni-Cu systems in sulphate-citrate medium |
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Authors: | Elvira Gómez Salvador Pané |
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Affiliation: | Laboratori d’Electrodeposició i Corrosió (Electrodep), Departament de Química Física, Facultat de Química, Universitat de Barcelona, Martí i Franquès, 1, 08028 Barcelona, Spain |
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Abstract: | Electrodeposition of Co-Ni and Co-Ni-Cu alloys was performed in a sulphate-citrate medium. Experimental electrodeposition parameters (pH, cobalt(II), nickel(II) and citrate concentrations) were varied in order to analyse their influence on the deposition. Anomalous Co-Ni codeposition occured in the citrate medium. High Ni(II)]/Co(II)] ratios (above 5) were suitable for the preparation of homogeneous magnetic Co-rich Co-Ni deposits of hexagonal close-packed (hcp) structure or face centred cubic (fcc) structure as a function of the deposition potential.The presence of very low copper(II) concentrations (<10−2 mol dm−3) in the nickel-cobalt bath makes it possible to incorporate copper in the deposits in amounts ranging from 5 to 60% Cu, although uniform deposits are obtained only for low copper percentages. These ternary deposits are solid solutions with fcc structure and magnetic behaviour both dependent on the deposition potential. |
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Keywords: | Cobalt-nickel Cobalt-nickel-copper Magnetic alloy Electrodeposition Ternary alloy |
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