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Corrosion behavior of palladium-silver-copper alloys in model saliva
L Joska, M Poddana, J Leitner
Language English Country England, Great Britain
Document type Comparative Study, Research Support, Non-U.S. Gov't
Grant support
NR9124
MZ0
CEP Register
- MeSH
- Time Factors MeSH
- Electrochemistry MeSH
- Corrosion MeSH
- Humans MeSH
- Copper * chemistry MeSH
- Electron Probe Microanalysis MeSH
- Saliva, Artificial * chemistry MeSH
- Palladium * chemistry MeSH
- Potentiometry MeSH
- Surface Properties MeSH
- Silver * chemistry MeSH
- Thermodynamics MeSH
- Materials Testing MeSH
- Dental Alloys * chemistry MeSH
- Check Tag
- Humans MeSH
- Publication type
- Research Support, Non-U.S. Gov't MeSH
- Comparative Study MeSH
OBJECTIVES: Palladium-silver system alloyed with other metals represents one of possible material choices in prosthetics. Its corrosion properties are influenced by minority components added in order to obtain the properties required for stomatological purposes. The objective of this work was to ascertain the influence of copper on the corrosion mechanism of palladium-silver alloys. METHODS: Corrosion properties of four palladium-silver-copper alloys were compared with the behavior of the palladium-silver binary system. Standard electrochemical measurements in a model saliva solution were complemented with an XPS analysis of the specimens surface. Experimental data were compared with the results of thermodynamic analysis. RESULTS: The foregoing study revealed formation of a saline layer of insoluble silver compounds as the dominant feature of the corrosion mechanism in a binary system. This process is suppressed in ternary alloys where electrochemical reactions of copper take place on the alloy-electrolyte phase boundary leading to the formation of a layer based on copper oxides. SIGNIFICANCE: The alloying of the palladium-silver binary system with copper results in an important change in the corrosion behavior of ternary alloys. A change in the mechanism of interaction with the environment leads to susceptibility to non-uniform corrosion.
References provided by Crossref.org
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- $a OBJECTIVES: Palladium-silver system alloyed with other metals represents one of possible material choices in prosthetics. Its corrosion properties are influenced by minority components added in order to obtain the properties required for stomatological purposes. The objective of this work was to ascertain the influence of copper on the corrosion mechanism of palladium-silver alloys. METHODS: Corrosion properties of four palladium-silver-copper alloys were compared with the behavior of the palladium-silver binary system. Standard electrochemical measurements in a model saliva solution were complemented with an XPS analysis of the specimens surface. Experimental data were compared with the results of thermodynamic analysis. RESULTS: The foregoing study revealed formation of a saline layer of insoluble silver compounds as the dominant feature of the corrosion mechanism in a binary system. This process is suppressed in ternary alloys where electrochemical reactions of copper take place on the alloy-electrolyte phase boundary leading to the formation of a layer based on copper oxides. SIGNIFICANCE: The alloying of the palladium-silver binary system with copper results in an important change in the corrosion behavior of ternary alloys. A change in the mechanism of interaction with the environment leads to susceptibility to non-uniform corrosion.
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