Improvement of Mechanical and Corrosion Properties of Commercially Pure Titanium Using Alumina PEO Coatings

In this study, the surface of commercially pure titanium (Cp-Ti) was covered by a 21–95 µm-thick aluminum oxide layer using plasma electrolytic oxidation. Coating characterization revealed the formation of nodular and granular α- and γ-Al2O3 phases with minor amounts of TiAl2O5 and Na2Ti4O9 which yi...

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Bibliographic Details
Published in:Coatings (Basel) 2022-01, Vol.12 (1), p.29
Main Authors: Malinovschi, Viorel, Marin, Alexandru Horia, Ducu, Catalin, Moga, Sorin, Andrei, Victor, Coaca, Elisabeta, Craciun, Valentin, Lungu, Mihail, Lungu, Cristian P.
Format: Article
Language:English
Subjects:
Aluminum oxide
Carbon steel
Coatings
Corrosion resistance
Electrolytes
Oxidation
Plasma
Sodium
Spectrum analysis
Substrates
Titanium
Titanium alloys
Transitional aluminas
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Summary:In this study, the surface of commercially pure titanium (Cp-Ti) was covered by a 21–95 µm-thick aluminum oxide layer using plasma electrolytic oxidation. Coating characterization revealed the formation of nodular and granular α- and γ-Al2O3 phases with minor amounts of TiAl2O5 and Na2Ti4O9 which yielded a maximum 49.0 GPa hardness and 50 N adhesive critical load. The corrosion resistance behavior in 3.5 wt.% NaCl solution of all plasma electrolytic oxidation (PEO) coatings was found to be two orders of magnitude higher compared to bare Ti substrate.
ISSN:2079-6412
2079-6412
DOI:10.3390/coatings12010029