Biomedical Engineering Reference
In-Depth Information
CHAPTER
9
Corrosion Resistance of Ti6Al4V
with Nanostructured TiO
2
Coatings
Q. Chen, G.D. McEwen, N. Zaveri, R. Karpagavalli, and A. Zhou
Department of Biological Engineering, Utah State University, Logan, UT, USA
CONTENTS
9.1
Introduction ....................................................................................................................................137
9.1.1
SiO
2
-CaO Coatings on Ti6Al4V Alloys ........................................................................ 138
9.1.2
SiO
2
and SiO
2
-TiO
2
Intermediate Coatings on Titanium and Ti6Al4V Alloy ..................... 138
9.1.3
Coated HA on Ti6Al4V by Electrophoretic Deposition................................................... 139
9.1.4
Double-Layer Glass-Ceramic Coatings on Ti6Al4V ....................................................... 139
9.2
Nanostructured TiO
2
Deposited on Ti6Al4V .......................................................................................139
9.2.1
Preparation of the Ti6Al4V Electrode ......................................................................... 140
9.2.2
TiO
2
Nanoparticles Coating ....................................................................................... 140
9.3
Characterization Techniques ...........................................................................................................140
9.3.1
SEM....................................................................................................................... 140
9.3.2
Raman Microscopy................................................................................................... 142
9.4
Corrosion Tests with Electrochemical Techniques .............................................................................144
9.4.1
OCV and Tafel Analysis............................................................................................. 145
9.4.2
EIS ........................................................................................................................ 147
9.5
Conclusions....................................................................................................................................147
References ............................................................................................................................................147
9.1
INTRODUCTION
Due to chronic exposure to biological conditions, metallic materials are preferred based on their
mechanical properties. The biocompatibility of these metals is limited to their reactivity and degra-
dation in the biological environment. Titanium and its alloys, such as Ti6A14V
[1,2]
, has excellent
properties, e.g., biocompatibility, corrosion resistance, low density, mechanical strength, and rela-
tively low cost
[3-5]
, all of these properties make titanium and its alloys a potential dental implant
material. Among these features, the corrosion resistance is of great importance, not only because it
determines the device service life, but also because of the harmfulness of corrosive processes tak-
ing place in the living organism. One important issue that needs to be addressed, is namely, how to
