CORROSION RESISTANCE OF Ti13Zr13Nb ALLOY WITH POLYMER AND COMPOSITE SOL-GEL BIOACTIVE GLASS/POLYMER COATINGS IN RINGER'S SOLUTION

摘要

The corrosion resistance of an uncoated near-β Ti13Zr13Nb 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 Ti13Zr13Nb alloy from corrosion in a Ringer's solution.