الفهرس 
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Abstract
In this study comparison between two of non-noble and semi-noble alloys to study the effect of repeated casting on:
1. The microstructure.
2. The corrosion behavior.
3. The mechanical properties.
The alloys selected were:
a) Non-noble alloys: including the nickel-chromium alloy from Ruthinium and the Gemini II alloy from kerr. b) Semi-noble alloys: including the palliag M alloy from Degu8sa and the Cast Palladium 20 alloy from sho£u.
These properties were tested as follows:
1. The microstructure:
Electrolytic polishing and etching using the Electrolytic Polishing Equipment ”Elypovist”.
2. The corrosion resistance:
Electrochemical test as described by Makrides using a Potentioscan ”Wenking Electronic Potentioscan” and an Electrometer ”Keithley 602 Electrometer”.
The corroded specimens were evaluated using the scanning electron microscope ”Jeol’”.