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Novel Application of Optical Density Technique to Evaluation of Corrosion Behavior of Metallic Thin Films

[+] Author Affiliations
Ruben Kotoka, Sergey Yarmolenko, Devdas Pai, Jag Sankar

North Carolina A&T State University, Greensboro, NC

Paper No. IMECE2011-64719, pp. 403-407; 5 pages
doi:10.1115/IMECE2011-64719
From:
  • ASME 2011 International Mechanical Engineering Congress and Exposition
  • Volume 3: Design and Manufacturing
  • Denver, Colorado, USA, November 11–17, 2011
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-5489-1
  • Copyright © 2011 by ASME

abstract

Bulk nanostructured metallic alloys as well as coatings are being research closely for biomedical applications, especially for implants. Corrosion behavior is of particular interest, given the aggressive environment of body fluids that these metals experience. While weight loss measurement and electrochemical analysis are the two commonly used techniques for corrosion behavior evaluation, both have their own limitations with respect to characterizing the corrosion of films and coatings under a micron in thickness. This paper reports on a novel application of the optical density technique as a relatively faster yet accurate method to evaluate the corrosion of thin metallic films. With this technique, the survivability and/or resorption time of a pure metallic coating is evaluated by monitoring the changes in optical density (directly related to reduction in film thickness, and thereby to weight loss) of thin film immersed in a corrosive media. In our experiments, Mg, Cu and Ag thin films of a wide range of thicknesses were sputter-deposited on glass substrates and the corrosion kinetics of these metals in a simulated body fluid was studied at room temperature. The results were utilized to develop a resorption time model for the coating, which can be used to predict the survivability of these metallic thin films.

Copyright © 2011 by ASME

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