Corrosion, erosion and erosion–corrosion performance of plasma electrolytic oxidation (PEO) deposited Al2O3 coatings


Barik, R.C., Wharton, J.A., Wood, R.J.K., Stokes, K.R. and Jones, R.L. (2005) Corrosion, erosion and erosion–corrosion performance of plasma electrolytic oxidation (PEO) deposited Al2O3 coatings. Surface and Coatings Technology, 199, (2-3), 158-167. (doi:10.1016/j.surfcoat.2004.09.038).

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Description/Abstract

Electrolytic plasma techniques have been used to surface modify 6082 aluminium alloy to a depth of 100 μm. Potentiodynamic polarisations and electrochemical impedance spectroscopy (EIS) have been made under static conditions in order to evaluate the corrosion performance of both unsealed and sealed PEO coatings. The erosion and erosion–corrosion performance of the unsealed PEO Al2O3 coating has also been assessed for a range erodent kinetic energies which varied between 0.016 and 7.1 μJ. The erosion and erosion–corrosion tests were carried out using subangular sand particles ranging in size from 135 to 235 μm. Scanning electron microscopy (SEM) was used to investigate the coating microstructure and the coating/substrate interface. The analyses show that the PEO Al2O3 coatings studied in this investigation had a pore/crack network to the Al alloy substrate, which compromised the corrosion performance and ultimately the erosion–corrosion performance.

Item Type: Article
ISSNs: 0257-8972 (print)
Related URLs:
Keywords: corrosion, erosion, erosion–corrosion, aluminium oxide, plasma electrolytic oxidation, slurry impingement, impedance spectroscopy
Subjects: T Technology > TP Chemical technology
Q Science > QD Chemistry
Q Science > QC Physics
Divisions: University Structure - Pre August 2011 > School of Engineering Sciences
ePrint ID: 23335
Date Deposited: 16 Mar 2006
Last Modified: 27 Mar 2014 18:12
URI: http://eprints.soton.ac.uk/id/eprint/23335

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