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Effect of gamma radiation on electrochemical corrosion behavior, structural morphology and hardness of silver- palladium dental alloy

Abu Bakr El-Bediwi, N.K.Radwan, S.Abdeen, DoaaAl- Ragaei

Effect of gamma radiation on electrochemical corrosion behavior, structural morphology and hardness of commercial silver- palladium dental alloy has been investigated. Matrix microstructure of silver- palladium such as crystallinty, crystal size and orientation changed after exposure to gamma radiationwhich effects on allmeasured properties.Corrosion potential (ECorr), corrosion current (ICorr), corrosion rate (CorrRate) and Tafel slopes (âc and âa) of silver- palladium alloy changed after exposure to gamma radiation. Corrosion potential of silver- palladiumalloy exhibited a negative potential. Also, the cathodic and the anodic polarization curves showed similar corrosion trends after exposure to gamma radiation. Vickers hardness of silver- palladiumdental alloy decreased after exposure to gamma radiation.