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The corrosion resistance of an uncoated near-β Til3Zrl3Nb titanium alloy as well as the alloy coated by a polymer (chitosan CHIT or polyetheretherketone PEEK), composite sol-gel bioactive glass/CHIT or porous sol-gel bioactive glass/PEEK coatings was investigated in Ringer's solution at 37°C. The microstructure of the alloy and the coatings was characterized by Scanning Electron Microscopy (SEM). The corrosion measurements were performed by electrochemical techniques like linear sweep voltamperometry and Electrochemical Impedance Spectroscopy (EIS). The corrosion tests showed that the porous sol-gel bioactive glass/PEEK and polymer CHIT coatings had a similar corrosion resistance to the substrate's one. The results indicated also that the deposition of PEEK and sol-gel bioactive glass/CHIT coatings significantly protect the Til3Zrl3Nb alloy from corrosion in a Ringer's solution
This work was supponted by the Polish National Science Centre (decision no. DEC$2013 / 09 / \mathrm{B} / \mathrm{ST} 8 / 00145)$
The authors appreciated the valuable contribution of DSc M. Kot (AGH) for scratch-tests, of Dr Katarzyna Cholcwa-Kowalska (AGH) for producing of sol-gel bioactive glass and JEOL (EUROPE) SA, branch in Poland, for SEM obscrvations.
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