Development of Titanium-Calcium Alloy Resistant to Aqueous Fluoride Solutions

Abstract:

It has been tried to develop Ti-Ca alloys which demonstrates corrosion resistance in an aqueous fluoride solutions. The Ti-Ca alloys were produced by diffusion-metallizing method. A Ti plate and Ca grains were put in a sealed container of stainless steel. As the container was heated at 1000 oC, Ca was melted and partially vaporized in the inner space. Ca then contacts and permeats into the Ti plate to metallize. In a holding time of 450 h, the alloy surface consisted of two layers, the first was oxide layer and the second was metal layer of about 200 m thick. A Vickers micro hardness of the second layer was quite large, upto about 600 Hv. Evaluation of corrosion resistance for the second layer and the inner part was carried out by electrochemical potentiokinetic method. Test solutions were aqueous fluoride solutions produced with HF and NaF. A concentration of fluoride ion was fixed to 0.024 kmol m-3, and pH of the solution was varied from 3.4 to 4.7. As a result, both Ti and Ti-Ca alloy were passivated under natural immersion condition in the solution of pH 4.7. At pH 3.4, on the other hand, Ti was actively dissolved, but Ti-Ca alloy was still passivated, that means Ti-Ca alloy performs much better corrosion resistance than Ti.

• Periodical: Materials Science Forum (Volumes 638-642)
• Pages: 564-569
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.638-642.564
• Online since: January 2010
• Authors: Takumi Haruna, Itsuki Shinohara
• Keywords: Corrosion, Dental Material, Fluoride Solution, Implant Materials, Titanium-Calcium Alloy

References

[1] Fejerskov and B. H. Clarkson: Dynamics of caries lesion formation, in: Fluoride in dentistry, ed by O. Fejerskov, J. Ekstrand, B. A. Burt, (Copenhagen, Munksgaard, 1996) pp.187-213.

[2] G. Rolla and J. Ekstrand: Fluoride in oral fluids and dental plaque, in: Fluoride in dentistry, ed by O. Fejerskov, J. Ekstrand, B. A. Burt, (Copenhagen, Munksgaard, 1996) pp.215-229.

[3] I. R. Hamilton and G. H. W. Bowden: Fluoride effects on oral bacteria, in: Fluoride in dentistry, ed by O. Fejerskov, J. Ekstrand, B. A. Burt, (Copenhagen, Munksgaard, 1996) pp.230-251.

[12] and Ti-Ca (vapor method) alloys in the aqueous solution containing fluoride ion of 0. 024 kmol m-3 at pHs (a) 4. 7 and (b) 3. 4.

[4] J. Mten Cate and J. D. M. Featherstone: Physicochemical aspects of fluoride-enamel interactions, in: Fluoride in dentistry, ed by O. Fejerskov, J. Ekstrand, B. A. Burt, (Copenhagen, Munksgaard, 1996) pp.252-272.

[5] H. S. S. Siirila and M. Kononen: The effect of oral topical fluorides on the surface of commercially pure titanium, Int J Oral Maxillofac Implants, 6, (1991) pp.50-54.

[6] L. Probster, W. Lin and H. Hutteman: Effect of fluoride prophylactic agents on titanium surfaces, Int J Oral Maxillofac Implants, 7, (1992) pp.390-394.

[7] G. Boere: Influence of fluoride on titanium in an acidic environment measured by polarization resistance technique, J App Biomater, 6 (1995) pp.283-288.

DOI: 10.1002/jab.770060409

[8] F. Toumelin-Chemla, F. Rouelle and G. Burdairon: Corrosive properties of fluoride-containing odontologic gels against titanium, J Dentistry, 24 (1996) pp.109-115.

DOI: 10.1016/0300-5712(95)00033-x

[9] M. Nakagawa, Y. Matono, S. Matsuya, K. Udoh and K. Ishikawa: The effect of Pt and Pd alloying additions on the corrosion behavior of titanium in fluoride-containing environments, Biomaterials, 26 (2005) pp.2239-2246.

DOI: 10.1016/j.biomaterials.2004.07.022

[10] Y. Matono, M. Nakagawa, S. Matsuya, K. Ishikawa and Y. Terada: Corrosion behavior of pure titanium and titanium alloys in various concentrations of acidulated phosphate fluoride (APF) solutions, Dent. Mater. J., 25 (2006) pp.104-112.

DOI: 10.4012/dmj.25.104

[11] Handbook of Chemistry - Fundamentals (fifth edition)-, ed. by The Chemical Society of Japan, (Maruzen, Tokyo, 2004) pp.153-155.

[12] T. Haruna, D. Motoya, Y. Nakagawa, N. Yamashita, and T. Oishi: Development of Ti-Mg Alloys Resistant to Aqueous Fluoride Solution, in: Ti-2007 Science and Technology, ed. by M. Niinomi, S. Akiyama, M. Ikeda, M. Hagiwara, and K. Maruyama, (The Japan Institute of Metals, 2007), Vol. II, pp.1429-1432.