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Effect of Al 2 O 3 –Ti composite coating on corrosion behavior of TiAl 6 V 4 alloy
Author(s) -
Mahmoudi M.,
MalekiGhaleh H.,
Kavanlouei M.,
Aghaie E.
Publication year - 2015
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.201307486
Subject(s) - materials science , dielectric spectroscopy , corrosion , electrophoretic deposition , scanning electron microscope , microstructure , coating , alloy , inert gas , metallurgy , composite number , polarization (electrochemistry) , analytical chemistry (journal) , electrochemistry , composite material , electrode , chemistry , chromatography
In the present study, Al 2 O 3 –Ti coated on TiAl 6 V 4 alloy used electrophoretic deposition (EPD) method to improve the corrosion resistance and biocompatibility. Electrophoretic deposition process was performed at 90 s and constant voltage of 50 V in various compositions of 30, 50, and 70 wt% of Al 2 O 3 . After deposition, samples were dried at room temperature and then the coated samples were sintered at 1050 °C for 4 h. Scanning electron microscope and X‐ray diffraction analysis were employed to investigate the microstructure and phase analysis of the coatings. Moreover, the behavior of the coated samples was investigated by using electrochemical impedance spectroscopy and polarization tests. The results show that the Al 2 O 3 –Ti composite coatings sintered at an inert gas (argon) atmosphere reveals a uniform, dense coating, which includes the composition of Ti and Al oxide phases. Evaluation of electrochemical test in simulated body fluid represents the improvement of the corrosion resistance of the coated sample in comparison to uncoated TiAl 6 V 4 sample. Moreover, the 50 wt% of Al 2 O 3 composite coated sample revealed the highest corrosion resistance among the coated samples due to a uniform and more stable phase composition in comparison to other coated samples.