title: Corrosion properties of Ag-Au-Cu-Pd system alloys containing indium.
abstract: In this study, the corrosion resistance of Ag-Au-Cu-Pd system alloys consisting of 5 or 10 mass% indium was evaluated. Levels of element release and tarnish were determined and electrochemical measurements performed. Results were compared with those for commercial silver-palladium-gold alloy. In terms of electrochemical behavior, the transpassive potential of these experimental alloys was 168-248mV. Experimental alloys with 25 mass% Au showed similar corrosion resistance to control gold-silver-palladium alloy. Amount of released elements was 14-130microg/cm(2) at 7 days, which is in the allowable range for dental alloys. Addition of indium to Ag-Au-Cu-10mass%Pd system alloys was effective in increasing resistance to tarnish and alloys containing 10 mass% of indium showed a minimal decrease in L(*) values after immersion. These findings indicate that 25Au-37.5Ag-15Cu-10Pd-2Zn-10In-0.5Ir alloy is applicable in dental practice.
authors.affiliation: Department of Dental Materials Science, Tokyo Dental College, Mihama-ku, Chiba, Japan. hattori@tdc.ac.jp
authors.forename: Masayuki
authors.initials: M
authors.lastname: Hattori
authors.forename: Teruhiko
authors.initials: T
authors.lastname: Tokizaki
authors.forename: Michihiko
authors.initials: M
authors.lastname: Matsumoto
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Oda
mesh_terms: D000704:Analysis of Variance; D003116:Color; D003343:Corrosion; D003722:Dental Alloys / Q000737:chemistry*; D006047:Gold Alloys / Q000737:chemistry*; D007204:Indium / Q000737:chemistry*; D008422:Materials Testing; D011199:Potentiometry; D018709:Statistics, Nonparametric
chemical_list: C120982:Ag-Pd-Cu-Au alloy; D003722:Dental Alloys; D006047:Gold Alloys; D007204:Indium