Influence of Amines on the Electrodeposition of Zn-Ni Alloy from a Eutectic-Type Ionic Liquid

• Tipo: Artigo em Revista Científica Internacional
• Data: 2015

Autores

Nuno Pereira (Autor) Outra; Carlos M Pereira (Autor) FCUP; araujo, j. p. (Autor) FCUP; Silva, F (Autor) FCUP

Revista

Título: Journal of the Electrochemical Society

Vol. 162

Páginas: D325-D330

ISSN: 0013-4651

Editora: Electrochemical Society, Inc.

Indexação

ISI Web of Knowledge - 15 Citações

Scopus - 17 Citações

Outras Informações

ID Authenticus: P-00G-BZE

DOI: 10.1149/2.0161508jes

Abstract (EN): Zn alloys are considered an alternative to replace Cd in protective coatings. Among Zn alloys, Zn-Ni are those with the higher corrosion resistance and better mechanical characteristics. Although Zn-Ni alloy can be electrodeposited from eutectic-type ionic liquid the morphology of the deposits needs to be improved. The effect of ethylamine and ethylenediamine on the electrodeposition of Zn-Ni alloy was investigated from a eutectic-type ionic liquid (ethaline). The presence of the amines in the plating bath modified the CV and j-t profiles. The nucleation mechanism was also influenced by adding the amines to the solution and the deposition of Zn-Ni in the presence of ethylenediamine followed the 3D progressive mechanism. Electrodeposition of Zn-Ni alloy from ethaline gives origin to a deposit with small grain particles with partial coverage of the electrode. Using the same electrodeposition conditions, the addition of amines allowed the full coverage of the electrode surface. In the presence of ethylamine deposit was formed by globular particles and by hexagonal platelets for deposits obtained in the presence ethylenediamine. Corrosion of the Zn-Ni metallic films was evaluated by potentiodynamic polarization experiments. The lowest value for the corrosion potential was obtained for the deposit prepared in the presence of ethylenediamine.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 6