Corrosion behaviour of detonation gun sprayed cermet coatings on AA5083

Arunnellaiappan, T and Baskaran, S and Arun, S and Prithivirajan, R (2020) Corrosion behaviour of detonation gun sprayed cermet coatings on AA5083. In: Surface Engineering .

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Abstract

Cermet coatings were fabricated on AA5083 by D gun coating technique using three different combinations of powder feedstock namely WC�Co, WC�Co�Cr, and Cr3C2�NiCr. The effect of powder combinations on coatings� phase composition, surface morphology, and cross-sectional microstructure were investigated using XRD, SEM, and EDS. Major findings revealed that WC�Co and WC�Co�Cr powders produced higher thickness with considerable surface defects compared to a coating that was produced by Cr3C2�NiCr powders. Moreover, a smooth compact and a uniform coating was obtained by using Cr3C2�NiCr powders. Electrochemical corrosion results showed that the OCP values of all the coated samples were shifted to a higher value than substrate and sample coated with Cr3C2�NiCr powder showed a stable OCP and more positive value than other coated samples. Similarly, the PDP curve of sample coated with Cr3C2�NiCr also showed lower corrosion current density at the cathodic region and better passivation behaviour in the anodic region. © 2020 Institute of Materials, Minerals and Mining Published by Taylor & Francis on behalf of the Institute.

Item Type:	Journal Article
Publication:	Surface Engineering
Publisher:	Taylor and Francis Ltd.
Additional Information:	The copyright of this article belongs to Taylor and Francis Ltd.
Keywords:	Cermets; Corrosive effects; Electrochemical corrosion; Morphology; Nickel compounds; Powder coatings; Powders; Sprayed coatings; Surface defects; Surface morphology, Anodic regions; Cermet coatings; Corrosion behaviour; Corrosion current densities; Cross-sectional microstructure; Detonation gun; Positive value; Uniform coating, Chromium compounds
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	02 Sep 2020 11:07
Last Modified:	02 Sep 2020 11:07
URI:	http://eprints.iisc.ac.in/id/eprint/66442

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