COBALT-INDIUM ALLOYS ELECTRODEPOSITION FROM CITRATE ELECTROLYTE AND SPATIO-TEMPORAL PATTERNS FORMATION
Cyclic voltammetry technique was used to compare the mechanism of the deposition of In, Co and Co-In from citrate electrolytes. Samples of Co-In coatings were electrodeposited at di erent current densities to permit the subsequent investigation of their physicochemical characteristics. It was establ...
| Authors: | , , , |
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| Format: | article |
| Status: | Published version |
| Publication Date: | 2013 |
| Country: | México |
| Institution: | Centro de Investigación y de Estudios Avanzados del IPN |
| Repository: | Redalyc-CINVESTAV |
| OAI Identifier: | oai:redalyc.org:62030721014 |
| Online Access: | https://www.redalyc.org/articulo.oa?id=62030721014 |
| Access Level: | Open access |
| Keyword: | Ingeniería XRD SEM EDX |
| Summary: | Cyclic voltammetry technique was used to compare the mechanism of the deposition of In, Co and Co-In from citrate electrolytes. Samples of Co-In coatings were electrodeposited at di erent current densities to permit the subsequent investigation of their physicochemical characteristics. It was established a strong relation between Co- In phase composition and the electrolysis conditions. At low current densities below the limiting current only In was deposited. At higher current the alloy phase of CoIn 3 was formed, besides that of In, and minority phases were Co and Co(OH) 2 . At higher current densities of about 0.8-1.5 A / dm 2 , when intensive hydrogen evolution was observed, specific patterns (spirals, waves, targets) were visible onto the Co-In coating surfaces, considered as spatio-temporal structures. The pattern formation could be promoted by the specific hydrodynamic conditions close to the cathode-electrolyte interface and by the concentration fluctuation of the ionic species. |
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