Corrosion behavior and microstructures of experimental Ti-Au alloys.
Anodic polarization was performed in 0.9% NaCl and 1% lactic acid solutions to characterize the relationship between the corrosion behavior and microstructures of cast Ti-Au (5-40%) alloys. An abrupt increase in the current density occurred at approximately 0.6 V vs. SCE for the 30% and 40% Au alloys in the 0.9% NaCl solution. The microstructures after corrosion testing indicated that this breakdown may have been caused by the preferential dissolution of the Ti3Au. However, the potential for preferential dissolution was higher than the breakdown potential of stainless steel or Co-Cr alloy, which meant that the corrosion resistance of the Ti-Au alloys was superior. In 1% lactic acid solution, the corrosion resistance of the Ti-Au alloys was excellent, with no breakdown at any composition. In the present test solutions, the Ti-Au alloys up to 20% Au had good corrosion resistance comparable to that for pure titanium.
Division of Dental Biomaterials, Graduate School of Dentistry, Tohoku University, Seiryo-machi, Aoba-ku, Sendai, Miyagi, Japan. m-tak@mail.tains.tohoku.ac.jp
Masatoshi
M
Takahashi
Masafumi
M
Kikuchi
Yukyo
Y
Takada
Osamu
O
Okuno
Toru
T
Okabe
D003343:Corrosion; D006047:Gold Alloys / Q000737:chemistry*; D019344:Lactic Acid / Q000737:chemistry; D008422:Materials Testing; D011199:Potentiometry; D012965:Sodium Chloride / Q000737:chemistry; D018709:Statistics, Nonparametric; D014025:Titanium / Q000737:chemistry*; D014961:X-Ray Diffraction
D006047:Gold Alloys; D019344:Lactic Acid; D012965:Sodium Chloride; D014025:Titanium