Chandrasekar, M.S. and Shanmugasigamani, S. and Malathy, P. (2009) Properties of Zinc alloy electrodeposits produced from acid and alkaline electrolytes. Journal of Solid State Electrochemistry, 13 (5). pp. 781-789. ISSN 1432-8488

PDF Restricted to Registered users only Download (623Kb) | Request a copy

Abstract

Zinc–cobalt (Zn–Co) and zinc–nickel (Zn–Ni) alloy electrodeposits each prepared from acid and alkaline formulations were compared for their properties. Compared to alkaline baths, acid baths offer higher metal percent of the alloying element and higher current efficiency. In alkaline baths, the variation of metal percent in deposit with current density is less significant, but that of current efficiency with current density is more. Electrolyte pH does not change significantly in alkaline solutions compared to acid solutions. X-ray diffraction evaluation of Zn–Co deposits from both electrolytes indicated their presence in the η-phase, while Zn– Ni shows pure γ-phase for deposits obtained from alkaline solutions and the existence of γ-phase with traces of η-phase of zinc for deposits obtained from the acid electrolytes. Scanning electron microscope examination shows finer grain structure for deposits obtained from alkaline solutions, and atomic force microscope studies confirm their nanostructure with reduced surface roughness. Deposits obtained from the alkaline baths exhibited higher corrosion resistance probably due to their nanostructure.

Item Type:	Article
Uncontrolled Keywords:	Electrodeposited zinc alloys; Comparison of baths; Cathodic current efficiency; Morphology; Corrosion resistance
Subjects:	Industrial Metal Finishing
Divisions:	UNSPECIFIED
Depositing User:	TTBD CECRI
Date Deposited:	08 Apr 2012 14:48
Last Modified:	08 Apr 2012 14:48
URI:	http://cecri.csircentral.net/id/eprint/665

Actions (login required)

View Item