title: Corrosion behaviour of titanium after short-term exposure to an acidic environment containing fluoride ions.
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.
authors.affiliation: Department of Metals and Corrosion Engineering, Institute of Chemical Technology, Technicka 5, 166 28 Prague 6, Czech Republic. Ludek.Joska@vscht.cz
authors.forename: Ludek
authors.initials: L
authors.lastname: Joska
authors.forename: Jaroslav
authors.initials: J
authors.lastname: Fojt
mesh_terms: D000143:Acids / Q000737:chemistry*; D001672:Biocompatible Materials / Q000737:chemistry*; D040761:Biomimetic Materials / Q000737:chemistry; D003343:Corrosion; D005459:Fluorides / Q000737:chemistry*; D006801:Humans; D006863:Hydrogen-Ion Concentration; D007477:Ions; D008422:Materials Testing; D012463:Saliva / Q000737:chemistry*; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry*
chemical_list: D000143:Acids; D001672:Biocompatible Materials; D007477:Ions; D014025:Titanium; D005459:Fluorides