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Corrosion Properties of Nanocrystalline Co–Cr Coatings

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Abstract

Nanocrystalline and conventional Co–Cr (ASTM F75) coatings were prepared by plasma spraying for possible orthopedic implant applications. Scanning electron microscopy and transmission electron microscopy were used to study the macrostructure and microstructure of the resultant sprayed coatings. The corrosion resistance was characterized by an in vitro potentiodynamic anodic polarization technique in a pseudophysiological solution. The nanocrystalline coating has higher porosity, lower corrosion current density, and less localized damage than that of the conventional one, demonstrating better application potential for orthopedic implants. A change in the atomic compositional difference between the grain interior and the grain boundary, the presence of residual strain in the grain interiors, and a change in the repassivation kinetics are discussed as possible explanations for the enhanced corrosion behavior observed. © 2001 Biomedical Engineering Society.

PAC01: 8165Kn, 8115Rs, 6146+w, 8780Rb, 6855-a, 5277Fv, 6837Hk, 8764Ee, 8107Bc, 6172Mm, 6837Lp

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Authors and Affiliations

  1. Department of Chemical and Biochemical Engineering and Materials Science, University of California, Irvine, Irvine, CA

    D. Cheng, V. L. Tellkamp & E. J. Lavernia

  2. Department of Orthopedics and Biomedical Engineering, University of Miami, Miami, FL

    C. J. Lavernia

Authors
  1. D. Cheng
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  2. V. L. Tellkamp
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  3. C. J. Lavernia
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  4. E. J. Lavernia
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Cheng, D., Tellkamp, V.L., Lavernia, C.J. et al. Corrosion Properties of Nanocrystalline Co–Cr Coatings. Annals of Biomedical Engineering 29, 803–809 (2001). https://doi.org/10.1114/1.1397790

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