Improving corrosion resistance of Ti-6Al-4V alloy through plasma-assisted PVD deposited nitride coatings

Author(s)

Oliveira, V. M. C. A. ^[1] ; Aguiar, C. ^[1] ; Vazquez, A. M. ^[1] ; Robin, A. ^[1] ; Barboza, M. J. R. ^[1]

Affiliation

^[1] Univ Sao Paulo, Escola Engn Lorena, Lorena, SP - Brazil

• Document type: Journal article
• Source: Corrosion Science; v. 88, p. 317-327, NOV 2014.
• Web of Science Citations: 47

Abstract

TiN and TiAlN/TiAlCrN were deposited on the alloy Ti-6Al-4V by means of plasma-assisted PVD technique in order to improve its corrosion resistance in a 2 M HCI solution at 25, 60, and 80 degrees C. The corrosion behaviour was investigated using open-circuit potential vs. time measurements, potentiodynamic polarization and electrochemical impedance spectroscopy. The uncoated Ti-6Al-4V alloy demonstrated an active behaviour with an active-passive transition in the HCI solution. The TiN and TiAlN/TiAlCrN coated Ti-6Al-4V alloy presented a passive behaviour. The corrosion resistance of the coated alloy was superior, which was evidenced by lower corrosion current densities and higher impedance values. (C) 2014 Elsevier Ltd. All rights reserved. (AU)

• FAPESP's process: 11/00511-0 - Study of the phenomena of creep, corrosion and isothermal oxidation of Ti-6Al-4V subjected to TiN and TiAlN coatings deposited by plasma-assisted PVD technologies.
• Grantee: Verônica Mara de Oliveira Velloso
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 13/00885-2 - Evaluation of TiN PVD coating on creep resistance of Ti-6Al-4V
• Grantee: Carla de Aguiar
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• FAPESP's process: 13/00886-9 - Study on the creep phenomenon of Ti-6Al-4V submitted to TiAl coating deposited by PVD plasma-assisted technique
• Grantee: Amira Muci Vazquez
• Support Opportunities: Scholarships in Brazil - Scientific Initiation