caa a22 4500 475816315 CHVBK 20180406123811.0 cr unu---uuuuu 170329e20000201xx s 000 0 eng 10.1023/A:1003820423207 doi (NATIONALLICENCE)springer-10.1023/A:1003820423207 Normal and anomalous codeposition of Zn-Ni alloys from chloride bath [Elektronische Daten] [G. Roventi, R. Fratesi, R.A. Guardia, G. Barucca] The codeposition of Zn-Ni alloys from chloride bath has been studied by means of potentiostatic electrodeposition in the potential range −700 to −1100 mV vs Ag/AgCl, where both normal and anomalous codeposition occurs. Deposition of alloys of different composition, morphology and structure, depending on the cathodic potential, was found. Analysis of the partial current densities showed that the production of nickel rich alloys in the potential range −700 to −900 mV is due to the underpotential reduction of zinc, driven by nickel ion discharge. Morphological and microstructural analyses showed that these alloys have the face-centred-cubic structure of nickel (α phase) and that the addition of zinc in the nickel lattice causes internal stresses in the deposits, which are prevalently amorphous. At potentials more negative than −910 mV, corresponding to the equilibrium potential of the zinc rich γ phase deposition, the rate of deposition of the α phase decreases and the further increase in deposit zinc content leads to the formation of the γ phase, with a decrease in internal stress. In this range of potential, zinc and nickel reduction can occur separately, according to their respective exchange current densities. Kluwer Academic Publishers, 2000 alloys nationallicence electrodeposition nationallicence nickel nationallicence zinc nationallicence Roventi G. Dipartimento di Scienze dei Materiali e della Terra, Università degli Studi di Ancona, Via Brecce Bianche, 60131, Ancona, Italy aut Fratesi R. Dipartimento di Scienze dei Materiali e della Terra, Università degli Studi di Ancona, Via Brecce Bianche, 60131, Ancona, Italy aut Guardia R.A. Dipartimento di Scienze dei Materiali e della Terra, Università degli Studi di Ancona, Via Brecce Bianche, 60131, Ancona, Italy aut Barucca G. INFM, Università degli Studi di Ancona, Via Brecce Bianche, 60131, Ancona, Italy aut Journal of Applied Electrochemistry Kluwer Academic Publishers 30/2(2000-02-01), 173-179 0021-891X 30:2<173 2000 30 10800 https://doi.org/10.1023/A:1003820423207 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1023/A:1003820423207 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Roventi G. Dipartimento di Scienze dei Materiali e della Terra, Università degli Studi di Ancona, Via Brecce Bianche, 60131, Ancona, Italy aut NATIONALLICENCE 700 1- Fratesi R. Dipartimento di Scienze dei Materiali e della Terra, Università degli Studi di Ancona, Via Brecce Bianche, 60131, Ancona, Italy aut NATIONALLICENCE 700 1- Guardia R.A. Dipartimento di Scienze dei Materiali e della Terra, Università degli Studi di Ancona, Via Brecce Bianche, 60131, Ancona, Italy aut NATIONALLICENCE 700 1- Barucca G. INFM, Università degli Studi di Ancona, Via Brecce Bianche, 60131, Ancona, Italy aut NATIONALLICENCE 773 0- Journal of Applied Electrochemistry Kluwer Academic Publishers 30/2(2000-02-01), 173-179 0021-891X 30:2<173 2000 30 10800 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer