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

• Type: Article in International Scientific Journal
• Date: 2015

Authors

Nuno Pereira (Author) Other; Carlos M Pereira (Author) FCUP; araujo, j. p. (Author) FCUP; Silva, F (Author) FCUP

Journal

Title: Journal of the Electrochemical Society

Vol. 162

Pages: D325-D330

ISSN: 0013-4651

Publisher: Electrochemical Society, Inc.

Indexing

ISI Web of Knowledge - 14 Citations

Scopus - 16 Citations

Other information

Authenticus ID: 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 6