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- Title
Incorporation of zirconia nanoparticles into coatings formed on aluminium by AC plasma electrolytic oxidation.
- Authors
Matykina, E.; Arrabal, R.; Skeldon, P.; Thompson, G. E.
- Abstract
Composite ceramic coatings were formed on aluminium by AC plasma electrolytic oxidation (PEO) using Na6P6O18 or Na2SiO3 · 5H2O/KOH electrolytes with monoclinic zirconia nanoparticles in suspension. The coatings grown in Na2SiO3 · 5H2O/KOH electrolyte revealed γ-Al2O3 and amorphous phase; α-Al2O3 and AlPO4 were additionally produced with the Na6P6O18 electrolyte. Higher temperature zirconia phases, possibly tetragonal and orthorhombic, in addition to the monoclinic phase, were indicative of elevated temperatures at sites of microdischarges. Further, local melting resulted in zirconium-rich dendrites in the coating formed in silicate electrolyte. Zirconium was mainly located in the relatively compact, outer layer of the coating, constituting ∼70–90% of the coating thickness. Nanoparticles appeared to be incorporated at the coating surface and following transport to the interface regions between the inner and outer layers along short-circuit paths through the outer coating.
- Subjects
ELECTROLYTIC oxidation; ELECTRIC breakdown; CERAMIC coating; PLASMA gases; ALUMINUM; ZIRCONIUM; ELECTROLYTES; TEMPERATURE; NANOPARTICLES; EQUIPMENT &; supplies
- Publication
Journal of Applied Electrochemistry, 2008, Vol 38, Issue 10, p1375
- ISSN
0021-891X
- Publication type
Article
- DOI
10.1007/s10800-008-9575-6