2024 - Sustainable Industrial Processing Summit
SIPS 2024 Volume 7. Lipkowski Intl. Symp / Physical Chemistry
| Editors: | F. Kongoli, J. Atwood, L. Barbour, G. Duca, R. Kuroda, A. Legocki, M. Zaworotko |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2024 |
| Pages: | 171 pages |
| ISBN: | 978-1-998384-16-7 (CD) |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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ZINC–NICKEL COATINGS ON SUBSTRATE IN PRESENCE OF CADMIUM IN ACID MEDIUM
Yassine Addi1;1ENPEI-USTHB, Algiers, Algeria;
Type of Paper: Regular
Id Paper: 178
Topic: 53
Abstract:
The electrodeposition of Zn-Ni is classified by Brenner [1], as anomalous codeposition, because zinc, the less noble metal, is preferentially deposited to nickel the more noble metal. The inhibition of H+ reduction occurs with increasing Zn ions concentration in solution [2]. Anomalous codeposition is favored in chloride medium and inhibited in boric acid [3].
The reaction kinetic of Zn-Ni codéposition was investigated in acid solutions. The effects of solution composition and pH were analyzed. The inhibition of H+ reduction occurs with increasing Zn ions concentration in solution. Increasing pH values causes Zn deposition during Ni-Zn codeposition. Anomalous codeposition is favored in chloride medium and inhibited in boric acid. When alloy deposition becomes the main process, the interfacial pH is governed by the individual metal deposition that controls the kinetic behavior. The interfacial pH increases during separate Ni deposition, meaning that it occurs with simultaneous consumption of H+. Anomalous codeposition process is not due to a saturation of species at the electrode surface.
The interest of the present work is focused in the study of the simultaneous electrodeposition of Ni and Zn. In the first part we studied the effect of the composition of the solution on the composition of the electrodeposited alloys. The second part is focused on the effect of boric acid on the codeposition of nickel and zinc.