Journal
JOURNAL OF APPLIED ELECTROCHEMISTRY
Volume 41, Issue 4, Pages 415-422Publisher
SPRINGER
DOI: 10.1007/s10800-010-0251-2
Keywords
Electrodeposition; Cu-Ni; Complexing agents; UV-Vis
Categories
Funding
- CNPq
- CAPES
- FINEP
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This study examined the influence of citrate and tartrate as complexing agents on the electrodeposition and surface morphology of Cu-Ni layers. The alloys obtained in the tartaric acid and sulphate baths were nobler than those obtained in the citric acid/citrate and citric acid/citrate/tartaric acid media. The results indicated that the complexing medium influences the nobility and the type of mass transport of the alloy formed. The morphology of the electrodeposited Cu-Ni layers changed from a rather porous appearance in the absence of the complexing agents to nodular, cracked mud and cauliflower appearances for the citric acid/sodium citrate/sodium sulphate medium, tartaric acid/sodium sulphate medium and citric acid/sodium citrate/tartaric acid/sodium sulphate medium, respectively. The chemical composition of the Cu-Ni layers revealed the preferential deposition of copper. The ultraviolet-visible spectrophotometry measurements indicated the occurrence of the d-d type transition, regardless of the complexing medium employed.
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