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Anodized titanium and stainless steel in contact with CFRP: An electrochemical approach considering galvanic corrosion
Author(s) -
Mueller Yves,
Tognini Roger,
Mayer Joerg,
Virtanen Sannakaisa
Publication year - 2007
Publication title -
journal of biomedical materials research part a
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.849
H-Index - 150
eISSN - 1552-4965
pISSN - 1549-3296
DOI - 10.1002/jbm.a.31198
Subject(s) - materials science , corrosion , titanium , galvanic corrosion , anodizing , galvanic cell , metallurgy , polarization (electrochemistry) , dielectric spectroscopy , carbon steel , immersion (mathematics) , crevice corrosion , electrochemistry , composite material , aluminium , electrode , chemistry , mathematics , pure mathematics
The combination of different materials in an implant gives the opportunity to better fulfill the requirements that are needed to improve the healing process. However, using different materials increases the risk of galvanic coupling corrosion. In this study, coupling effects of gold‐anodized titanium, stainless steel for biomedical applications, carbon fiber reinforced polyetheretherketone (CFRP), and CFRP containing tantalum fibers are investigated electrochemically and by long‐term immersion experiments in simulated body fluid (SBF). Potentiodynamic polarization experiments (i/E curves) and electrochemical impedance spectroscopy (EIS) of the separated materials showed a passive behavior of the metallic samples. Anodized titanium showed no corrosion attacks, whereas stainless steel is highly susceptibility for localized corrosion. On the other side, an active dissolution behavior of both of the CFRPs in the given environment could be determined, leading to delaminating of the carbon fibers from the matrix. Long‐term immersion experiments were carried out using a set‐up especially developed to simulate coupling conditions of a point contact fixator system (PC‐Fix) in a biological environment. Electrochemical data were acquired in situ during the whole immersion time. The results of the immersion experiments correlate with the findings of the electrochemical investigation. Localized corrosion attacks were found on stainless steel, whereas anodized titanium showed no corrosion attacks. No significant differences between the two CFRP types could be found. Galvanic coupling corrosion in combination with crevice conditions and possible corrosion mechanisms are discussed. © 2007 Wiley Periodicals, Inc. JBiomed Mater Res, 2007