Abstract
Metallographic studies carried out for Tytin-Plus and Dispersalloy amalgams show a porous multiphase material, whose surface phases are: γ-(Ag3Sn), γ1-(Ag2Hg3), η′-(Cu6Sn5) and ε-(Cu3Sn). Additionally, Dispersalloy is present in the Ag–Cu eutectic. The application of surface analysis by SEM reveal a heterogeneous distribution of the above mentioned phases. Microstructures consisting of colonies or clusters were not observed. The corrosion testing of these materials was done in 0.9% NaCl aerated solution at 25°C using potentiodynamic polarization curves and ac impedance measurements. The corrosion process in these multiphase systems can be interpreted as the sum of more than one electrodissolution process and the posterior formation of corrosion films. On each electrode, the corrosion film is formed by different mechanisms.
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