Electrochemical behavior of cast Ti-Ag alloys.
Anodic polarization tests were performed in 0.9% NaCl and 1% lactic acid solutions to characterize the relationship between the corrosion behavior and the microstructures of cast Ti-Ag (5-40% Ag) alloys. The anodic polarization curves for the Ti-Ag alloys up to 17.5% Ag were similar to those for pure titanium in both solutions. On the other hand, an abrupt increase in the current density was observed for the alloys with more than 20% Ag in the NaCl solution and with more than 27.5% Ag in the lactic acid solution. The microstructures of the corroded alloy surfaces indicated the deterioration of precipitated intermetallic compounds along the grain boundaries. The Ti-Ag alloys up to 17.5% Ag had excellent corrosion resistance similar to that of pure titanium. The alloys with 20-25% Ag may be also used as dental alloys, since they passivated again immediately after preferential dissolution in the NaCl solution.
Takahashi
Masatoshi
M
Division of Dental Biomaterials, Graduate School of Dentistry, Tohoku University, Sendai, Miyagi, Japan. m-tak@mail.tains.tohoku.ac.jp
Kikuchi
Masafumi
M
Takadai
Yukyo
Y
Okabe
Toru
T
Okuno
Osamu
O
D000143:Acids / Q000494:pharmacology; D003343:Corrosion; D003722:Dental Alloys / Q000737:chemistry*; D003764:Dental Materials / Q000737:chemistry*; D012834:Silver / Q000737:chemistry*; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry*
D000143:Acids; D003722:Dental Alloys; D003764:Dental Materials; D012834:Silver; D014025:Titanium