Effects of Voltage on the Characteristics and Corrosion Resistance of Microarc Oxidation Coatings on Ti6Al4V Alloy

Zong Chun Hu; Fa Qin Xie; Xiang Qing Wu

doi:10.4028/www.scientific.net/AMR.97-101.1336

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 97-101Effects of Voltage on the Characteristics and...

Effects of Voltage on the Characteristics and Corrosion Resistance of Microarc Oxidation Coatings on Ti6Al4V Alloy

Abstract:

Ceramic coatings were prepared on Ti6Al4V in aluminate-based electrolyte by microarc oxidation at various voltages using potentiostatic regime. The phase composition, microstructure and morphology of the coatings were characterized by eddy thickness gauge, XRD and SEM respectively. The corrosion resistance of the coatings was investigated by polarization curve and electrochemical impedance spectroscopy (EIS) in 3.5% NaCl aqueous solution. The results show that all the coatings are mainly composed of Al2TiO5. When the voltage increases from 360V to 510V, the coating thickness grows significantly, and the pores in the coatings get large and deep simultaneously. As a result, the corrosion resistance of the coatings increases first and then decreases with the turning point of 410V, at which the coating prepared shows the smallest corrosion current density of 1.965E-9 A/cm2. The coating prepared at a higher voltage before the discharges grow large and intense (410V in this work) shows the best corrosion resistance.

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Periodical:

Advanced Materials Research (Volumes 97-101)

Pages:

1336-1339

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.97-101.1336

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Online since:

March 2010

Authors:

Zong Chun Hu, Fa Qin Xie, Xiang Qing Wu

Keywords:

Corrosion Resistance, Micro-Arc Oxidation (MAO), Ti6Al4V, Voltage

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