title: The corrosion behavior of Nd2Fe14B and SmCo5 magnets.
abstract: Rare earth magnets have corrosive problems associated with their use in prostheses in various fields including orthodontics. The purpose of this study is to investigate the corrosion behavior of an Nd2Fe14B magnet and a SmCo5 magnet in an oral environment. The relations among the attractive force changes, the released elements, the weight changes and the anodic polarization measurements of the magnets were examined under immersions in 1% NaCl, 1% lactic acid, 0.05% HCl, 0.1% Na2S and Greenwood's artificial saliva at 37 degrees C for forty-two days. The results showed that the rare earth magnets underwent high corrosive assaults and large attractive force reductions by the immersions in 1% lactic acid and 0.05% HCl. The problem of corrosion of the magnets could be overcome by sealing them within laser-welded stainless steel capsules.
authors.affiliation: School of Dentistry, Tokyo Medical and Dental University, Japan.
authors.forename: A
authors.initials: A
authors.lastname: Kitsugi
authors.forename: O
authors.initials: O
authors.lastname: Okuno
authors.forename: T
authors.initials: T
authors.lastname: Nakano
authors.forename: H
authors.initials: H
authors.lastname: Hamanaka
authors.forename: T
authors.initials: T
authors.lastname: Kuroda
mesh_terms: D003343:Corrosion; D017268:Dental Prosthesis Retention / Q000295:instrumentation*; D006851:Hydrochloric Acid / Q000737:chemistry; D007773:Lactates / Q000737:chemistry; D019344:Lactic Acid; D008280:Magnetics; D008422:Materials Testing; D009354:Neodymium / Q000737:chemistry*; D012464:Saliva, Artificial / Q000737:chemistry; D012493:Samarium / Q000737:chemistry*; D013440:Sulfides / Q000737:chemistry
chemical_list: D007773:Lactates; D012464:Saliva, Artificial; D013440:Sulfides; D009354:Neodymium; D019344:Lactic Acid; D012493:Samarium; D006851:Hydrochloric Acid; C033479:sodium sulfide