Electrochemical deposition and corrosion stability of Zn-Co alloy coatings

Abstract

The influence of the type of the deposition solution, deposition current density and temperature of deposition solution on the phase structure and corrosion properties of Zn-Co alloys was examined. Alloys were deposited on a rotating disc electrode from chloride and sulphate plating bath. The phase structure was determined by anodic linear sweep voltammetry (ALSV) and corrosion properties by polarization measurements. It was shown that Zn-Co alloys with the best corrosion properties, among all investigated in this work, were obtained from chloride plating bath at room temperature at 4,5 and 5 A dm-2.

Izučavan je uticaj vrste rastvora za taloženje, gustine struje taloženja i temperature rastvora za taloženje na fazni sastav, kao i na korozionu stabilnost legura Zn-Co. Legure su taložene na rotirajućoj disk elektrodi iz sulfatnog i hloridnog rastvora. Fazni sastav legura je određivan metodom anodne linearne promene potencijala (ALPP), a koroziona stabilnost polarizacionim merenjima. Pokazano je da najveću korozionu stabilnost imaju legure dobijene taloženjem iz hloridnog rastvora na sobnoj temperaturi sa 4,5 i 5 A dm-2.