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Plasma electrolytic oxidation (PEO) for production of anodised coatings on lightweight metal (Al, Mg, Ti) alloys

Plasma electrolytic oxidation (PEO) for production of anodised coatings on lightweight metal (Al, Mg, Ti) alloys
Plasma electrolytic oxidation (PEO) for production of anodised coatings on lightweight metal (Al, Mg, Ti) alloys
The introduction of plasma electrolytic oxidation (PEO) as a surface finishing technique has enabled a range of hard, dense oxide coatings to be produced on aluminium, magnesium, titanium and other lightweight alloy substrates. As with all surface coating technologies, successful development of PEO coatings requires adequate attention to substrate pretreatment together with careful control of electrolyte conditions and process variables. The principles and applications of the PEO coating process are considered, including the fundamentals of oxide deposition, the technology involved and the typical characteristics of the coatings. Industrial applications are considered together with their coating requirements. Plasma electrolytic oxidation coating is a specialised but well developed process. Suitable control of electrolyte and process conditions can realise a novel range of coatings having technologically attractive physical and chemical properties. The development of PEO technology over the last decade has provided coatings having controlled appearance, hardness, corrosion resistance and other tribological properties across an extending range of industrial sectors. Continuing developments are concisely reviewed and the PEO process is illustrated by the characterisation of anodised coatings on an AZ91 magnesium alloy surface.
spark discharge, ac anodising, oxide coatings
0020-2967
122-135
Walsh, F.C.
309528e7-062e-439b-af40-9309bc91efb2
Low, C.T.J.
e993d0ca-2b64-424b-9535-20bc8b78415f
Wood, R.J.K.
d9523d31-41a8-459a-8831-70e29ffe8a73
Stevens, K.T.
feb213fa-7fcd-4aaf-a172-7c59371c16e7
Archer, J.
d6f07caf-14d2-4b6d-ab70-b76c98be40e5
Poeton, A.R.
fa2e9cbf-3e7f-4958-ab77-c633878fda31
Ryder, A.
7a4f8f6c-92d3-4f89-997d-2d4fc7756618
Walsh, F.C.
309528e7-062e-439b-af40-9309bc91efb2
Low, C.T.J.
e993d0ca-2b64-424b-9535-20bc8b78415f
Wood, R.J.K.
d9523d31-41a8-459a-8831-70e29ffe8a73
Stevens, K.T.
feb213fa-7fcd-4aaf-a172-7c59371c16e7
Archer, J.
d6f07caf-14d2-4b6d-ab70-b76c98be40e5
Poeton, A.R.
fa2e9cbf-3e7f-4958-ab77-c633878fda31
Ryder, A.
7a4f8f6c-92d3-4f89-997d-2d4fc7756618

Walsh, F.C., Low, C.T.J., Wood, R.J.K., Stevens, K.T., Archer, J., Poeton, A.R. and Ryder, A. (2009) Plasma electrolytic oxidation (PEO) for production of anodised coatings on lightweight metal (Al, Mg, Ti) alloys. Transactions of the IMF, 87 (3), 122-135. (doi:10.1179/174591908X372482).

Record type: Article

Abstract

The introduction of plasma electrolytic oxidation (PEO) as a surface finishing technique has enabled a range of hard, dense oxide coatings to be produced on aluminium, magnesium, titanium and other lightweight alloy substrates. As with all surface coating technologies, successful development of PEO coatings requires adequate attention to substrate pretreatment together with careful control of electrolyte conditions and process variables. The principles and applications of the PEO coating process are considered, including the fundamentals of oxide deposition, the technology involved and the typical characteristics of the coatings. Industrial applications are considered together with their coating requirements. Plasma electrolytic oxidation coating is a specialised but well developed process. Suitable control of electrolyte and process conditions can realise a novel range of coatings having technologically attractive physical and chemical properties. The development of PEO technology over the last decade has provided coatings having controlled appearance, hardness, corrosion resistance and other tribological properties across an extending range of industrial sectors. Continuing developments are concisely reviewed and the PEO process is illustrated by the characterisation of anodised coatings on an AZ91 magnesium alloy surface.

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Published date: 2009
Keywords: spark discharge, ac anodising, oxide coatings

Identifiers

Local EPrints ID: 65975
URI: http://eprints.soton.ac.uk/id/eprint/65975
ISSN: 0020-2967
PURE UUID: 1a2f3f30-76f1-495e-b350-c1f48188d9fd
ORCID for R.J.K. Wood: ORCID iD orcid.org/0000-0003-0681-9239

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Date deposited: 17 Aug 2009
Last modified: 14 Mar 2024 02:37

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Contributors

Author: F.C. Walsh
Author: C.T.J. Low
Author: R.J.K. Wood ORCID iD
Author: K.T. Stevens
Author: J. Archer
Author: A.R. Poeton
Author: A. Ryder

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