Enhancement in the corrosion resistance of nanocrystalline aluminium coatings by incorporation of graphene oxide

Punith Kumar, MK and Laxmeesha, PM and Ray, S and Srivastava, C (2020) Enhancement in the corrosion resistance of nanocrystalline aluminium coatings by incorporation of graphene oxide. In: Applied Surface Science, 533 .

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Abstract

Non-aqueous electrolyte containing aluminium chloride (AlCl3) and 1-ethyl-3-methylimidazolium chloride (EMImCl) topped with n-decane was used to electrodeposit aluminium (Al) coating via chronoamperometric method at ambient atmosphere. Aluminium-graphene oxide (Al-GO) composite coating was further obtained from the Al electrolytic bath by dispersing GO in it. GO was prepared by oxidation of high purity graphite. The Al deposition potential was noted by cyclic voltammetry (CV) method. Influence of GO on the morphology and microstructure of Al metal matrix was analysed by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and X-ray diffraction spectroscopy (XRD). Inclusion of GO into the Al matrix enhanced the coating compactness thus nullifying the surface defects which were observed for the pristine Al deposit. The texture co-efficient calculation showed that the addition of GO altered the growth texture from growth predominately along (0 0 2) plane for pure Al coating to growth predominantly along (1 1 1) and (0 2 2) plane for Al-GO composite coating. The morphological and microstructural changes occurred in the Al coating from GO incorporation influenced the anti-corrosion behaviour of the coatings. The electrochemical corrosion analysis by Tafel polarization and Impedance Spectroscopy confirmed that the GO reinforced Al deposit possessed two-fold enhanced anticorrosive property than pure Al coating. © 2020 Elsevier B.V.

Item Type:	Journal Article
Publication:	Applied Surface Science
Publisher:	Elsevier B.V.
Additional Information:	The copyright of this article belongs to Elsevier B.V.
Keywords:	Aluminum chloride; Aluminum coated steel; Aluminum coatings; Aluminum corrosion; Aluminum metallography; Aluminum oxide; Chlorine compounds; Composite coatings; Corrosion resistance; Corrosive effects; Cyclic voltammetry; Deposits; Electrochemical corrosion; Electrochemical impedance spectroscopy; Electrolytes; Energy dispersive spectroscopy; Graphene; Morphology; Nanocrystals; Paraffins; Scanning electron microscopy; Surface defects; Textures, 1-ethyl-3-methylimidazolium chloride; Anti-corrosive properties; Energy dispersive X ray spectroscopy; Impedance spectroscopy; Microstructural changes; Nanocrystalline aluminium; Non-aqueous electrolytes; X-ray diffraction spectroscopy, Corrosion resistant coatings
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	28 Aug 2020 09:33
Last Modified:	28 Aug 2020 09:33
URI:	http://eprints.iisc.ac.in/id/eprint/66402

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