Galvanic corrosion of ferritic stainless steels used for dental magnetic attachments in contact with an iron-platinum magnet.
This study was an examination of the galvanic corrosion of ferritic stainless steels, namely SUS 444, SUS XM27, and SUS 447J1, in contact with a Fe-Pt magnet. The surface area ratio of each stainless steel to the Fe-Pt magnet was set at 1/1 or 1/10. Galvanic corrosion between the stainless steels and the magnet was evaluated by the amount of released ions and the electrochemical properties in 0.9% NaCl solution. Although each stainless steel showed sufficient corrosion resistance for clinical use, the amount of ions released from each tended to increase when the stainless steel was in contact with the magnet. When the surface area ratio was reduced to 1/10, the amount of Fe ions released from the stainless steels increased significantly more than when there was no contact. Since contact with the magnet which possessed an extremely noble potential created a very corrosive environment for the stainless steels, 447J1 was thus the recommended choice against a corrosion exposure as such.
Division of Fixed Prosthodontics, Graduate School of Dentistry, Tohoku University, 4-1 Seiryo-machi, Aoba-ku, Sendai 980-8575, Japan.
Keisuke
K
Nakamura
Yukyo
Y
Takada
Masanobu
M
Yoda
Kohei
K
Kimura
Osamu
O
Okuno
D003343:Corrosion; D003722:Dental Alloys / Q000737:chemistry*; D017268:Dental Prosthesis Retention / Q000295:instrumentation*; D004563:Electrochemistry; D007477:Ions; D008280:Magnetics / Q000295:instrumentation*; D008422:Materials Testing; D012965:Sodium Chloride; D013193:Stainless Steel / Q000737:chemistry
D003722:Dental Alloys; C503680:Fe-Pt-Nb alloy; D007477:Ions; D013193:Stainless Steel; D012965:Sodium Chloride