Effect of Al2O3 Particle Concentration on the Characteristics of Microarc Oxidation Coatings Formed on Pure Titanium

Microarc oxidation coatings were successfully fabricated on pure titanium substrates by microarc oxidation (MAO) in electrolytes with Al2O3 particles of varying concentrations, which ranged from 0 to 4 g·L-1 (0, 1, 2, 3, 4 g·L-1). The voltage versus time curves, surface and cross-sectional morpholog...

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Bibliographic Details
Published in:International journal of electrochemical science 2018-09, Vol.13 (9), p.8995-9006
Main Authors: Wang, Ping, Pu, Jun, Zhou, Jia Hao, Cao, Wen Jie, Xiao, You Tao, Gong, Ze Yu, Hu, Jie
Format: Article
Language:English
Subjects:
Al2O3 particles
Microarc oxidation
Pure titanium
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Summary:Microarc oxidation coatings were successfully fabricated on pure titanium substrates by microarc oxidation (MAO) in electrolytes with Al2O3 particles of varying concentrations, which ranged from 0 to 4 g·L-1 (0, 1, 2, 3, 4 g·L-1). The voltage versus time curves, surface and cross-sectional morphologies, thicknesses, microhardnesses, phase compositions, coating adhesive strengths, thermal shock resistances and polarization curves of MAO coatings were investigated. The results revealed that the voltage, the microhardness and the thickness of the coatings increased with the addition of Al2O3 particles. Both the number and size of sintered discs on the coating surface increased gradually with the ascending concentration of Al2O3 particles. The XRD results indicated that the MAO coatings mainly consisted of α-Al2O3, SiO2 and rutile. The corrosion resistance of the coatings was improved, while the addition of Al2O3 particles had less effect on the adhesive strength of the MAO coatings. The study revealed that an appropriate addition of Al2O3 particles in electrolytes is beneficial to promote the performance of coatings.
ISSN:1452-3981
1452-3981
DOI:10.20964/2018.09.66