Evolution of PEO coatings on AM50 magnesium alloy using phosphate-based electrolyte with and without glycerol and its electrochemical characterization

Jangde, A and Kumar, S and Blawert, C (2020) Evolution of PEO coatings on AM50 magnesium alloy using phosphate-based electrolyte with and without glycerol and its electrochemical characterization. In: Journal of Magnesium and Alloys, 8 (3). pp. 692-715.

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Abstract

PEO coatings were synthesized from phosphate-based (bP-PEO) and glycerol added phosphate-based (gP-PEO) electrolytes with different processing times. For both bP-PEO and gP-PEO coatings treated with different processing time its morphology, elemental and phase composition, and electrochemical behaviour has been comparatively investigated. For this, scanning electron microscope (SEM), energy-dispersive X-ray spectroscopy (EDXS), X-ray diffraction, electrochemical impedance spectroscopy (EIS), and potentiodynamic polarization techniques were employed. The gP-PEO coatings were observed to have higher pore density with reduced pores size, surface porosity, and average coating thickness compared to bP-PEO for all the PEO processing time. XRD studies revealed that glycerol addition resulted in the fostering of crystalline MgO (periclase) phase and promoting Mg3(PO4)2 (farringtonite) phase amorphization. In general, electrochemical behaviour showed improved corrosion behaviour for gP-PEO compared to bP-PEO. © 2020

Item Type:	Journal Article
Publication:	Journal of Magnesium and Alloys
Publisher:	National Engg. Reaserch Center for Magnesium Alloys
Additional Information:	Copy right for this article belongs to National Engg. Reaserch Center for Magnesium Alloys
Keywords:	Magnesium alloy; Plasma electrolytic oxidation; Glycerol additive; Electrochemical impedance spectroscopy; Corrosion.
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	19 Oct 2020 11:21
Last Modified:	19 Oct 2020 11:21
URI:	http://eprints.iisc.ac.in/id/eprint/65822

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