Effects of fluoride and dissolved oxygen concentrations on the corrosion behavior of pure titanium and titanium alloys.
The effects of dissolved-oxygen concentration and fluoride concentration on the corrosion behaviors of commercial pure titanium, Ti-6Al-4V and Ti-6Al-7Nb alloys and experimentally produced Ti-0.2Pd and Ti-0.5Pt alloys were examined using the corrosion potential measurements. The amount of dissolved Ti was analyzed by inductively coupled plasma mass spectroscopy. A decrease in the dissolved-oxygen concentration tended to reduce the corrosion resistance of Ti and Ti alloys. If there was no fluoride, however, corrosion did not occur. Under low dissolved-oxygen conditions, the corrosion of pure Ti and Ti-6Al-4V and Ti-6Al-7Nb alloys might easily take place in the presence of small amounts of fluoride. They were corroded by half or less of the fluoride concentrations in commercial dentifrices. The Ti-0.2Pd and Ti-0.5Pt alloys did not corrode more, even under the low dissolved-oxygen conditions and a fluoride-containing environment, than pure Ti and Ti-6Al-4V and Ti-6Al-7Nb alloys. These alloys are expected to be useful as new Ti alloys with high corrosion resistance in dental use.
Nakagawa
Masaharu
M
Division of Oral Rehabilitation, Faculty of Dental Science, Kyushu University, Fukuoka, Japan.
Matsuya
Shigeki
S
Udoh
Koichi
K
D000497:Alloys; D002327:Cariostatic Agents / Q000737:chemistry*; D003343:Corrosion; D003722:Dental Alloys / Q000737:chemistry*; D004563:Electrochemistry; D005459:Fluorides / Q000737:chemistry*; D006801:Humans; D006863:Hydrogen-Ion Concentration; D007101:Immersion; D013058:Mass Spectrometry; D008422:Materials Testing; D010100:Oxygen / Q000737:chemistry*; D010165:Palladium / Q000737:chemistry; D010984:Platinum / Q000737:chemistry; D012464:Saliva, Artificial / Q000737:chemistry; D012969:Sodium Fluoride / Q000737:chemistry; D012995:Solubility; D014025:Titanium / Q000737:chemistry*
D000497:Alloys; D002327:Cariostatic Agents; D003722:Dental Alloys; D012464:Saliva, Artificial; C070282:Ti-6Al-7Nb alloy; C031462:titanium alloy (TiAl6V4); D010984:Platinum; D010165:Palladium; D012969:Sodium Fluoride; D014025:Titanium; D005459:Fluorides; D010100:Oxygen