Corrosion properties of β-Ta alloyed Ti6Al4V by double-glow plasma surface alloying technique

To improve the corrosion resistance of biomedical titanium alloys, Ta-modified layer was prepared on Ti6Al4V substrate by double-glow plasma surface alloying technique (DGPSAT) at 750 °C. The effects of alloying time of Ta coating on the microstructure, film cohesion strength, as well as the electro...

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Bibliographic Details
Published in:Journal of materials science 2021-04, Vol.56 (10), p.6487-6498
Main Authors: Liu, Ying, Zhou, Bing, Wang, Hongkong, Gao, Jie, Ma, Yong, Hei, Hongjun, Wu, Yanxia, Yu, Shengwang
Format: Article
Language:English
Subjects:
Alloying effects
Characterization and Evaluation of Materials
Chemistry and Materials Science
Classical Mechanics
Cohesion
Corrosion resistance
Corrosion resistant alloys
Crystallography and Scattering Methods
Electrochemical corrosion
Materials Science
Metal surfaces
Metals & Corrosion
Phase transitions
Polymer Sciences
Prolongation
Solid Mechanics
Strength
Substrates
Surface alloying
Surgical implants
Tantalum
Tantalum oxides
Thickness
Titanium alloys
Titanium base alloys
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Summary:To improve the corrosion resistance of biomedical titanium alloys, Ta-modified layer was prepared on Ti6Al4V substrate by double-glow plasma surface alloying technique (DGPSAT) at 750 °C. The effects of alloying time of Ta coating on the microstructure, film cohesion strength, as well as the electrochemical corrosion property had been investigated. Results showed that there were mainly β-Ta phase formed at 750 °C, the crystal grew bigger without phase transition and the layer thickness increases with the prolongation of alloying time. However, the cohesion strength and corrosion resistance of the film increase first and then decrease with the prolonging alloying time. In particular, the sample with alloying time of 30 min maintains the best cohesion strength and corrosion resistance. These are attributed to the following factors: a denser and more homogeneous coating with high cohesion strength formed on the substrate, higher positive E corr and lower I corr in phosphate buffered saline (PBS) solution. Both of these accelerate the formation of tantalum oxides protective layers on metal surface and thus maintain the excellent properties.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-020-05626-y