title: Corrosion resistance evaluation of Pd-free Ag-Au-Pt-Cu dental alloys.
abstract: The corrosion resistance of nine experimental Pd-free Ag-Au-Pt-Cu dental alloys in a 0.9% NaCl solution was investigated using cyclic voltammetry (CV), optical microscopy, and scanning electron microscopy (SEM). CV measurements revealed that the breakdown potential (E(bd)) and zero current potential (E(zc)) increased with increasing Au/(Au+Ag) atomic ratio. Thus, the Au/(Au+Ag) atomic ratio, but not the Cu content, influenced the corrosion resistance of Ag-Au-Pt-Cu alloys. After the forward scan of CV, both optical and scanning electron microscope images showed that in all the experimental alloys, the matrix phase was corroded but not the second phase. From corrosion resistance viewpoint, the Ag-Au-Pt-Cu alloys seemed to be suitable for clinical application.
authors.affiliation: Department of Dental and Biomedical Materials Science, Unit of Basic Medical Science, Graduate School of Biomedical Sciences, Nagasaki University, 1-7-1 Sakamoto, Nagasaki 852-8588, Japan.
authors.forename: Takeshi
authors.initials: T
authors.lastname: Fujita
authors.forename: Takanobu
authors.initials: T
authors.lastname: Shiraishi
authors.forename: Yasuko
authors.initials: Y
authors.lastname: Takuma
authors.forename: Kunihiro
authors.initials: K
authors.lastname: Hisatsune
mesh_terms: D055598:Chemical Phenomena; D003300:Copper / Q000737:chemistry*; D003343:Corrosion; D003722:Dental Alloys / Q000737:chemistry; D055664:Electrochemical Techniques; D006047:Gold Alloys / Q000737:chemistry*; D006801:Humans; D008422:Materials Testing; D008853:Microscopy; D008855:Microscopy, Electron, Scanning; D010984:Platinum / Q000737:chemistry*; D011048:Polarography; D011199:Potentiometry; D012834:Silver / Q000737:chemistry*; D012965:Sodium Chloride / Q000737:chemistry; D013052:Spectrometry, X-Ray Emission; D013499:Surface Properties; D013696:Temperature
chemical_list: D003722:Dental Alloys; D006047:Gold Alloys; D012834:Silver; D012965:Sodium Chloride; D010984:Platinum; D003300:Copper