Wear-resistant black decorative coating produced by the plasma electrolytic oxidation method on titanium alloys
https://doi.org/10.17073/1997-308X-2016-1-44-50
Abstract
The study determines the technological mode of plasma electrolytic treatment (PET) processes for the VT6 (Ti-6Al-4V) and VT1-0 titanium alloys allowing to obtain SiO2-based amorphous black decorative coatings on their surfaces at high speed (>5 μm/min at 10 A/dm2 AC density). The coating applied to the VT6 alloy increases its wear resistance more than twice. The mechanism of black decorative coating formation on titanium alloys is proposed. It is based on the obsidian formation due to rapid solidification of the SiO2 melt and the penetration of small vanadium oxide amounts into the amorphous SiO2-based coating. While decorative black coating on the VT6 alloy is obtained due to the presence of vanadium oxide (4,3 %) in the obsidian-based coating, in order to create the coating of the same decorative colour on the VT1-0 alloy it is necessary to introduce sodium vanadate into aqueous solution during the plasma electrolytic treatment.
About the Authors
A. G. Rakoch
National University of Science and Technology (NUST) «MISIS»
Russian Federation
Russian Federation
Dr. Sci. (Chem.), prof., Department of metal protection and surface treatment (MP&ST),
119049, Moscow, Leninskii pr., 4
D. M. Strekalina
National University of Science and Technology (NUST) «MISIS»
Russian Federation
Russian Federation
postgraduate student, teaching assistant, Department of MP&ST,
119049, Moscow, Leninskii pr., 4
A. A. Gladkova
National University of Science and Technology (NUST) «MISIS»
Russian Federation
Russian Federation
PhD, associate prof., Department of MP&ST,
119049, Moscow, Leninskii pr., 4
K. S. Melkonyan
National University of Science and Technology (NUST) «MISIS»
Russian Federation
Russian Federation
postgraduate student, Department of MP&ST,
119049, Moscow, Leninskii pr., 4
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Review
For citations:
Rakoch A.G., Strekalina D.M., Gladkova A.A., Melkonyan K.S. Wear-resistant black decorative coating produced by the plasma electrolytic oxidation method on titanium alloys. Powder Metallurgy аnd Functional Coatings (Izvestiya Vuzov. Poroshkovaya Metallurgiya i Funktsional'nye Pokrytiya). 2016;(1):44-50. (In Russ.) https://doi.org/10.17073/1997-308X-2016-1-44-50
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