Corrosion Resistance of Ti-6Al-4V Machined Surfaces Improved by Thermal Oxidation

Authors

  • Carolina Aurélia Ribeiro Maestro São João Del Rei Federal University (UFSJ)
  • Marina Cristina Ferreira São João Del Rei Federal University (UFSJ)
  • Alysson Helton Santos Bueno São João Del Rei Federal University (UFSJ)
  • Artur Mariano de Sousa Malafaia São João Del Rei Federal University (UFSJ)

DOI:

https://doi.org/10.4186/ej.2020.24.5.185

Keywords:

thermal oxidation, machining, Ti-6Al-4V, roughness, corrosion resistance, biomaterial

Abstract

Ti-6A-l4V alloy is widely used in implants and prosthesis applications. Although machining is a fast and economical process, the roughness generated can compromise corrosion resistance. Thus, the goal of this study was to overcome this limitation using thermal oxidation in machined surfaces. Samples with polished surfaces were used for comparison purposes. Two sets of machining parameters were used to generate different roughness, property evaluated in polished and machined samples before and after thermal oxidation. Vickers microhardness and polarization tests using simulated body fluid (SBF) were also performed. Thermal oxidation generated similar microhardness for polished and machined samples, higher than for polished and non-oxidized condition. On the other hand, oxidation increased the roughness only for polished condition. The corrosion resistance was improved in all oxidized samples, and the best result was found to the intermediate roughness (Ra = 0.76 um), in a machined sample. The results demonstrated that thermal oxidation can be used to overcome machining limitations regarding corrosion resistance, achieving behavior even better than polished samples.

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Author Biographies

Carolina Aurélia Ribeiro Maestro
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São João Del Rei Federal University (UFSJ), Campus Santo Antônio, Praça Frei Orlando, 170, Centro, 36307-352, São João Del Rei/MG, Brazil

Marina Cristina Ferreira
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São João Del Rei Federal University (UFSJ), Campus Santo Antônio, Praça Frei Orlando, 170, Centro, 36307-352, São João Del Rei/MG, Brazil

Alysson Helton Santos Bueno
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São João Del Rei Federal University (UFSJ), Campus Santo Antônio, Praça Frei Orlando, 170, Centro, 36307-352, São João Del Rei/MG, Brazil

Artur Mariano de Sousa Malafaia
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São João Del Rei Federal University (UFSJ), Campus Santo Antônio, Praça Frei Orlando, 170, Centro, 36307-352, São João Del Rei/MG, Brazil

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Published In
Vol 24 No 5, Sep 30, 2020
How to Cite
[1]
C. A. Ribeiro Maestro, M. C. Ferreira, A. H. Santos Bueno, and A. M. . de Sousa Malafaia, “Corrosion Resistance of Ti-6Al-4V Machined Surfaces Improved by Thermal Oxidation”, Eng. J., vol. 24, no. 5, pp. 185-193, Sep. 2020.
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