Phase constitution, surface chemistry and corrosion behavior of electrodeposited MnFeCoNiCu high entropy alloy-graphene oxide composite coatings

Aliyu, A and Srivastava, C (2022) Phase constitution, surface chemistry and corrosion behavior of electrodeposited MnFeCoNiCu high entropy alloy-graphene oxide composite coatings. In: Surface and Coatings Technology, 429 .

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Abstract

MnFeCoNiCu high entropy alloy (HEA) coatings with and without graphene oxide (GO) incorporation was deposited onto a mild steel substrate by the electrodeposition method. Coating morphology, phase constitution, corrosion properties, and coatings surface chemistry before and after corrosion in a 3.5 wt NaCl solution was investigated. A predominantly body-centered cubic (BCC) phase with a minor fraction of face-centered cubic (FCC) phase was obtained in the pristine coating. Whereas a nearly equal volume fraction of FCC and BCC phases formed in coatings with increasing GO content. Corrosion characteristics of the MnFeCoNiCu HEA coatings with different GO content were studied. All the GO containing coatings exhibited higher corrosion resistance than the coating without GO in 3.5 wt NaCl solution. The corrosion resistance of the coatings increased with increasing GO content. The surface chemistry of the coatings before and after exposure was studied by X-ray photoelectron spectroscopy (XPS). These results showed that the GO incorporation into the MnFeCoNiCu matrix enhanced the formation of stable oxides, which can reduce ionic diffusion, thus improving the corrosion resistance of the MnFeCoNiCu HEA-GO coatings when compared to the MnFeCoNiCu HEA coating without GO. © 2021 Elsevier B.V.

Item Type:	Journal Article
Publication:	Surface and Coatings Technology
Publisher:	Elsevier B.V.
Additional Information:	The copyright for this article belongs to Elsevier B.V.
Keywords:	Cobalt alloys; Composite coatings; Copper alloys; Copper corrosion; Corrosion rate; Corrosion resistance; Corrosion resistant coatings; Corrosive effects; Electrochemical corrosion; Electrodes; Entropy; Graphene; High-entropy alloys; Iron alloys; Manganese alloys; Metal cladding; Morphology; Photoelectrons; Photons; Sodium chloride; Surface chemistry, 3.5 wt NaCl solution; A: mild steels; Alloy coatings; Body-centered-cubic phase; Composites coating; Corrosion behaviour; High entropy alloy coating; High entropy alloys; Phase constitution; Potentiodynamics polarization, X ray photoelectron spectroscopy
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	21 Dec 2021 05:47
Last Modified:	21 Dec 2021 05:47
URI:	http://eprints.iisc.ac.in/id/eprint/70665

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