Abstract
The negative effect of fluoride ions on titanium has been known in dentistry for a long time. The presented work was aimed at the interaction between titanium and model saliva following a short-term exposure of a specimen to a model medical preparation rich in fluoride ions. The experimental work was carried out using titanium grade 2 in a physiological solution (pH non-adjusted, 5.8, 4.2; 5000 ppm F−) and in model saliva. Electrochemical measurement techniques were supplemented with XPS analysis. The presence of fluoride ions resulted in partial degradation of the passive layer even in a slightly acidic environment. The decrease of pH to the value of 4.2 and the presence of 5000 ppm F− caused titanium activation followed by a slow repassivation in model saliva. Formation of low soluble compound rich in fluorine explains experimental data. Short medical treatment can result in relatively long period of increased titanium corrosion.
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Acknowledgements
This study was supported by the research programme MSM 6046137302 (Ministry of Education, Youth and Sports of the Czech Republic) and, in part, by a grant 106089003 from the ICT Prague to J. Fojt.
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Joska, L., Fojt, J. Corrosion behaviour of titanium after short-term exposure to an acidic environment containing fluoride ions. J Mater Sci: Mater Med 21, 481–488 (2010). https://doi.org/10.1007/s10856-009-3930-y
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DOI: https://doi.org/10.1007/s10856-009-3930-y