title: An electrochemical and multispectroscopic study of corrosion of Ag-Pd-Cu-Au alloys.
abstract: Corrosion of a multi-phase Ag-Pd-Cu-Au-based commercial dental casting alloy and a Cu-Pd-rich and Ag-rich single-phase alloy was studied by open-circuit potential measurements, atomic absorption spectrometry, and electron spectroscopy. The alloys were immersed in an artificial saliva solution for 24 hr while the open-circuit potentials of the alloys were measured. The potentials were found to stabilize at certain levels after a steep rise during the first hours of the experiment. Cu was found to dissolve considerably from the Cu-Pd-rich alloy, with simultaneous enrichment of Pd in the surface layer of the alloy. Ag dissolved slightly from the Ag-rich alloy, but both Cu and Ag were found to dissolve from the multi-phase alloy. Neither Pd nor Au dissolved from any of the alloys studied.
authors.forename: L
authors.initials: L
authors.lastname: Niemi
authors.forename: E
authors.initials: E
authors.lastname: Minni
authors.forename: A
authors.initials: A
authors.lastname: Ivaska
mesh_terms: D055598:Chemical Phenomena; D002627:Chemistry, Physical; D003300:Copper / Q000032:analysis; D003343:Corrosion; D003734:Dental Casting Investment; D004563:Electrochemistry; D004577:Electron Probe Microanalysis; D006047:Gold Alloys / Q000032:analysis; D009067:Mouthwashes / Q000032:analysis; D010165:Palladium / Q000032:analysis; D012464:Saliva, Artificial / Q000032:analysis; D012834:Silver / Q000032:analysis; D012995:Solubility; D013054:Spectrophotometry, Atomic; D015032:Zinc / Q000032:analysis
chemical_list: D003734:Dental Casting Investment; D006047:Gold Alloys; D009067:Mouthwashes; D012464:Saliva, Artificial; D012834:Silver; D010165:Palladium; D003300:Copper; D015032:Zinc