Morphological and electrochemical characterization of electrodeposited Zn-Ag nanoparticle composite coatings

Kumar, Punith MK and Srivastava, Chandan (2013) Morphological and electrochemical characterization of electrodeposited Zn-Ag nanoparticle composite coatings. In: MATERIALS CHARACTERIZATION, 85 . pp. 82-91.

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Abstract

Silver nanoparticles with an average size of 23 nm were chemically synthesized and used to fabricate Zn-Ag composite coatings. The Zn-Ag composite coatings were generated by electrodeposition method using a simple sulfate plating bath dispersed with 0.5, land 1.5 g/l of Ag nanoparticles. Scanning electron microscopy, X-ray diffraction and texture co-efficient calculations revealed that Ag nanoparticles appreciably influenced the morphology, micro-structure and texture of the deposit. It was also noticed that agglomerates of Ag nanopartides, in the case of high bath load conditions, produced defects and dislocations on the deposit surface. Ag nanoparticles altered the corrosion resistance property of Zn-Ag composite coatings as observed from Tafel polarization, electrochemical impedance analysis and an immersion test. Reduction in corrosion rate with increased charge transfer resistance was observed for Zn-Ag composite coatings when compared to a pure Zn coating. However, the particle concentration in the plating bath and their agglomeration state directly influenced the surface morphology and the subsequent corrosion behavior of the deposits. (C) 2013 Elsevier Inc. All rights reserved.

Item Type:	Journal Article
Publication:	MATERIALS CHARACTERIZATION
Publisher:	ELSEVIER SCIENCE INC
Additional Information:	copyright for this article belongs to ELSEVIER SCIENCE INC USA
Keywords:	Ag nanoparticles; Zn-Ag composite coating; Chemical heterogeneities; Corrosion
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	23 Dec 2013 05:21
Last Modified:	23 Dec 2013 05:21
URI:	http://eprints.iisc.ac.in/id/eprint/47959

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