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Tribocorrosion behavior of Ca–P MAO coatings on Ti6Al4V alloy at various applied voltages

Published online by Cambridge University Press:  16 December 2019

You Zuo
Affiliation:
Department of Materials Science and Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, China; and Department of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China
Tianlu Li
Affiliation:
Department of Materials Science and Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, China
Xinyun Jiang
Affiliation:
Department of Materials Science and Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, China
Minbao Wu
Affiliation:
Department of Materials Science and Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, China
You Zhang
Affiliation:
Department of Materials Science and Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, China
Fei Chen*
Affiliation:
Department of Materials Science and Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, China; and Beijing Key Lab of Special Elastomer Composite Materials, Department of Material Science and Engineering, Beijing Institute of Petroleum Technology, Beijing 102617, China
*
a)Address all correspondence to this author. e-mail: chenfei@bipt.edu.cn
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Abstract

In this study, coatings containing Ca and P elements on Ti6Al4V alloy were fabricated by micro-arc oxidation at different applied voltages. Subsequently, evaluation of the phase structure, morphology, element composition, corrosion mechanism, and tribocorrosion behavior of these coatings was performed. The results showed that the coatings consisted of rutile TiO2 and anatase TiO2. The ratio of rutile/anatase, surface roughness, and hardness increase with the increase of applied voltage. Electrochemical impedance spectroscopy results indicated the corrosion resistance of coatings in simulated body fluid of 400 V > 380 V > 420 V. The open circuit potential of sample 400 V declined during the tribocorrosion test. Sample 420 V possessed the highest wear volume after the tribocorrosion process. The tribocorrosion mechanism of samples 380 and 420 V was mainly confirmed as the wear effect, and the decline of corrosion resistance due to the micro-cracks formed during the abrasive wear of the coating accounts for the tribocorrosion mechanism of sample 400 V.

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Article
Copyright
Copyright © Materials Research Society 2019

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