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

Corrosion, erosion and erosion–corrosion performance of plasma electrolytic oxidation (PEO) deposited Al2O3 coatings
Corrosion, erosion and erosion–corrosion performance of plasma electrolytic oxidation (PEO) deposited Al2O3 coatings
Electrolytic plasma techniques have been used to surface modify 6082 aluminium alloy to a depth of 100 ?m. 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 ?J. The erosion and erosion–corrosion tests were carried out using subangular sand particles ranging in size from 135 to 235 ?m. 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.
corrosion, erosion, erosion–corrosion, aluminium oxide, plasma electrolytic oxidation, slurry impingement, impedance spectroscopy
0257-8972
158-167
Barik, R.C.
56ec9884-0c15-4c28-9752-cb9966432ac1
Wharton, J.A.
965a38fd-d2bc-4a19-a08c-2d4e036aa96b
Wood, R.J.K.
d9523d31-41a8-459a-8831-70e29ffe8a73
Stokes, K.R.
5fb4e7f7-2f7e-4e6e-a045-6d7690626695
Jones, R.L.
b8369a09-6a20-4675-999f-3c34a6114bf0
Barik, R.C.
56ec9884-0c15-4c28-9752-cb9966432ac1
Wharton, J.A.
965a38fd-d2bc-4a19-a08c-2d4e036aa96b
Wood, R.J.K.
d9523d31-41a8-459a-8831-70e29ffe8a73
Stokes, K.R.
5fb4e7f7-2f7e-4e6e-a045-6d7690626695
Jones, R.L.
b8369a09-6a20-4675-999f-3c34a6114bf0

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).

Record type: Article

Abstract

Electrolytic plasma techniques have been used to surface modify 6082 aluminium alloy to a depth of 100 ?m. 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 ?J. The erosion and erosion–corrosion tests were carried out using subangular sand particles ranging in size from 135 to 235 ?m. 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.

Full text not available from this repository.

More information

Published date: 2005
Keywords: corrosion, erosion, erosion–corrosion, aluminium oxide, plasma electrolytic oxidation, slurry impingement, impedance spectroscopy

Identifiers

Local EPrints ID: 23335
URI: https://eprints.soton.ac.uk/id/eprint/23335
ISSN: 0257-8972
PURE UUID: 4b6829d6-a874-4623-845f-1cdb27ae1188
ORCID for J.A. Wharton: ORCID iD orcid.org/0000-0002-3439-017X
ORCID for R.J.K. Wood: ORCID iD orcid.org/0000-0003-0681-9239

Catalogue record

Date deposited: 16 Mar 2006
Last modified: 06 Jun 2018 13:06

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