Corrosion Resistance on the Reacted Surface of Titanium Castings with a Phosphate Bonded Silica Investment

DOI 2 Citations
  • DOI Hisashi
    Division of Metallurgy, Institute for Medical and Dental Engineering, Tokyo Medical and Dental University
  • YONEYAMA Takayuki
    Division of Metallurgy, Institute for Medical and Dental Engineering, Tokyo Medical and Dental University
  • KOTAKE Masato
    Division of Metallurgy, Institute for Medical and Dental Engineering, Tokyo Medical and Dental University
  • HAMANAKA Hitoshi
    Division of Metallurgy, Institute for Medical and Dental Engineering, Tokyo Medical and Dental University

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  • リン酸塩系埋没材を用いたチタン鋳造体表面層の耐食性の検討

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Abstract

Dental casting techniques of titanium have made marked progress in recent years.However, as titanium is very active in the melting condition, layers reacted with the mold are formed on the surface of the castings.The corrosion characteritics on the reacted surface layer of titanium castings were studied in saline solution by using electro-chemical technique and observation by SEM.Three types of surface condition were tested-A:cleaned with ultrasonic cleaning equipment;B:sand-blasted;C:buffed.Al though the surface condition A showed a lower corrosion resistance than the two other conditions, its corrosion resistance was much better than those of dental alloys such as Ni-Cr, Co-Cr and silver alloys.Voltamogram of the surface condition B was similar to that of the surface condition C.SEM observations before and after the voltammetry did not show marked changes on the surface condition B.As a result, the reacted surface layer on the titanium castings seems to be reliable with respect to the corrosion resistance in a static condition.

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