INVESTIGADORES
FERNANDEZ LORENZO Monica Alicia
artículos
Título:
Tarnishing and corrosion of silver-based casting alloys in synthetic salivas of different compositions
Autor/es:
FERNÁNDEZ LORENZO DE MELE, M; DUFFÓ, G
Revista:
JOURNAL OF APPLIED ELECTROCHEMISTRY
Editorial:
SPRINGER
Referencias:
Año: 2002 vol. 32 p. 57 - 64
ISSN:
0021-891X
Resumen:
The aim of this work is to study the electrochemical response of Ag and Ag-based alloys in synthetic salivas ofdifferent compositions. The effect of several anions present in saliva on the dissolution of Ag and some of the alloycomponents, such as Pd and Cu, was evaluated. Potentiostatic and potentiodynamic techniques were used and werecomplemented with atomic adsorption and XPS analysis. Chloride, fluoride and thiocyanate were particularlyanalysed because of their aggressiveness. Corrosion, pigmentation and/or tarnishing processes were enhanced whenthey were present in the synthetic saliva. A dependence of the selectivity of Pd dissolution from Ag?15Pd binaryalloy with the potential was noticed. Ag microsegregations and precipitates formed on casting alloys showed higheractivity than the matrix and rendered the alloy more susceptibility to deterioration. The need to use a normalisedsaliva to make comparisons of electrochemical results is highlighted.
