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Journal of Nanomaterials
Volume 2017 (2017), Article ID 6825250, 10 pages
Research Article

Enhancement of the Pitting Corrosion Resistance of AISI 316LVM Steel with Ta-Hf-C/Au Bilayers for Biomedical Applications

1School of Engineering, Universidad Militar Nueva Granada, Carrera 11, No. 101-80, 49300 Bogotá, Colombia
2CIC biomaGUNE, Paseo Miramón 182, 20009 Donostia, Spain

Correspondence should be addressed to Luis Yate

Received 16 October 2016; Revised 13 December 2016; Accepted 29 December 2016; Published 17 January 2017

Academic Editor: Albano Cavaleiro

Copyright © 2017 Pablo Guzmán et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Tantalum carbide (TaC), hafnium carbide (HfC), and Ta-Hf-C mixed coatings with and without a gold (Au) interlayer were deposited on 316LVM steel substrates by the magnetron cosputtering technique in order to improve the corrosion resistance of steel substrates in a simulated biological fluid. To study the effect of the gold interlayer on pitting corrosion, the different systems were placed in contact with Ringer’s solution at pH 7.4 and a temperature of 37°C. The electrochemical properties of the coatings were determined using polarization curves. Subsequently, the surface morphologies were observed using scanning electron microscopy (SEM) in order to analyze the corrosion processes on the different surfaces. The gold interlayer was found to significantly improve the electrochemical properties of the system, showing a decrease in the pitting corrosion and deterioration rate, while it is expected that the binary and ternary carbides provide mechanical stability to the bilayers protecting the gold.