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

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 Institute of Metal Finishing, 87, (3), 122-135. (doi:10.1179/174591908X372482).


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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.

Item Type: Article
Digital Object Identifier (DOI): doi:10.1179/174591908X372482
ISSNs: 0020-2967 (print)
Related URLs:
Keywords: spark discharge; ac anodising; oxide coatings
Subjects: Q Science > Q Science (General)
Divisions : University Structure - Pre August 2011 > School of Engineering Sciences
ePrint ID: 65975
Accepted Date and Publication Date:
Date Deposited: 17 Aug 2009
Last Modified: 31 Mar 2016 12:51

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