Abstract
Bioactive PEO coating on titanium with high Ca/P ratio was fabricated and characterized with respect to its morphology, composition and microstructure. Long-term electrochemical stability of the coating and Ti4+ ion release was evaluated in artificial saliva. Influence of the lactic acid and fluoride ions on corrosion protection mechanism of the coated titanium was assessed using AC and DC electrochemical tests. The PEO-treated titanium maintained high passivity in the broad range of potentials up to 2.5 V (Ag/AgCl) for up to 8 weeks of immersion in unmodified saliva and exhibited Ti4+ ion release <0.002 µg cm−2 days−1. The high corrosion resistance of the coating is determined by diffusion of reacting species through the coating and resistance of the inner dense part of the coating adjacent to the substrate. Acidification of saliva in the absence of fluoride ions does not affect the surface passivity, but the presence of 0.1 % of fluoride ions at pH ≤4.0 causes loss of adhesion of the coating due to inwards migration of fluoride ions and their adsorption at the substrate/coating interface in the presence of polarisation.
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Acknowledgments
The authors are grateful to the Community of Madrid (Spain, S2009MAT-1585) for the financial support. R. Arrabal and E. Matykina are grateful to the MICINN (Spain) for financial support via the Ramon y Cajal Programme (RYC-2008-02038, RYC-2010-06749).
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Matykina, E., Arrabal, R., Mohedano, M. et al. Stability of plasma electrolytic oxidation coating on titanium in artificial saliva. J Mater Sci: Mater Med 24, 37–51 (2013). https://doi.org/10.1007/s10856-012-4787-z
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DOI: https://doi.org/10.1007/s10856-012-4787-z