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[Corrosion behavior of palladium-based alloys]
Deutsche Zahnarztliche Zeitschrift
|February 1, 1989
Summary
This study classified 45 palladium-based alloys into three types based on their electrochemical corrosion behavior. Casting significantly altered corrosion properties, particularly for types 2 and 3, with gallium content noted as a concern.
Area of Science:
- Materials Science
- Electrochemistry
- Metallurgy
Context:
- Dental alloys are crucial in restorative dentistry.
- Understanding the corrosion behavior of palladium-based alloys is essential for clinical longevity.
- The study investigates alloys in their as-received and cast states.
Purpose:
- To electrochemically characterize the corrosion behavior of 45 palladium-based alloys.
- To classify these alloys into distinct types based on their polarization curves.
- To assess the impact of casting on their corrosion resistance.
Summary:
- Potentiodynamic polarization tests classified palladium-based alloys into three types: Type 1 (high gold, flat curve), Type 2 (intermediate peak), and Type 3 (pronounced peaks, similar to silver-based alloys).
- Casting induced more significant changes in corrosion behavior for Types 2 and 3 compared to Type 1.
- Alloy composition, particularly gallium content, was linked to alloy type, with gallium being undesirable in non-precious dental alloys.
Impact:
- Provides a classification system for palladium-based alloys based on corrosion resistance.
- Highlights the influence of manufacturing processes (casting) on alloy performance.
- Identifies potential material concerns (gallium content) for dental applications.