The effect of Pt and Pd alloying additions on the corrosion behavior of titanium in fluoride-containing environments.
In this study, we examined the corrosion behaviors of pure titanium, the alloys Ti-6Al-4V and Ti-6Al-7Nb, and the new experimental alloys Ti-Pt and Ti-Pd using anodic polarization and corrosion potential measurements in an environment containing fluoride. Before and after immersion in the test solutions, we made observations using a scanning electron microscope. The test solutions included an artificial saliva containing 0.2% NaF (corresponding to 905 ppm F) and an artificial saliva with a low concentration of oxygen. Although the surfaces of the Ti-Pt and Ti-Pd alloys were not affected by an acidic environment containing fluoride, the surfaces of the pure titanium, the Ti-6Al-4V alloy, and the Ti-6Al-7Nb alloy were markedly roughened by corrosion. The surfaces of the pure titanium, the Ti-6Al-4V alloy, and the Ti-6Al-7Nb alloy were microscopically damaged by corrosion when they were immersed in the solution containing a low concentration of dissolved oxygen, even with a fluoride concentration included in the commercial dentifrices. In this situation, however, the surfaces of the new Ti-Pt and Ti-Pd alloys were not affected. These alloys are expected to be of use in dental work as new titanium alloys with high corrosion resistances.
Nakagawa
M
M
Department of Biomaterials, Division of Oral Rehabilitation, Faculty of Dental Science, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka, 812-8582, Japan. nakagawa@dent.kyushu-u.ac.jp
Matono
Y
Y
Matsuya
S
S
Udoh
K
K
Ishikawa
K
K
D000497:Alloys; D040761:Biomimetic Materials / Q000737:chemistry; D002424:Caustics / Q000737:chemistry; D003343:Corrosion; D003764:Dental Materials / Q000737:chemistry; D003802:Dentifrices / Q000737:chemistry; D005457:Fluoridation / Q000379:methods; D005459:Fluorides / Q000737:chemistry*; D008422:Materials Testing; D010165:Palladium / Q000737:chemistry*; D010984:Platinum / Q000737:chemistry*; D012463:Saliva / Q000737:chemistry*; D013499:Surface Properties; D014025:Titanium / Q000032:analysis / Q000737:chemistry*
D000497:Alloys; D002424:Caustics; D003764:Dental Materials; D003802:Dentifrices; C070282:Ti-6Al-7Nb alloy; C031462:titanium alloy (TiAl6V4); D010984:Platinum; D010165:Palladium; D014025:Titanium; D005459:Fluorides