ISSN 2305-6894

Effect of ZrO2 addition on the corrosion resistance of gallium-based restorative

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1 Dept. of Metallurgical Engineering, Materials Engineering College, University of Babylon, Babylon, Iraq
2 Materials Engineering, University of Babylon, Babylon, Iraq

Abstract: Specimens of a gallium-based dental alloy were prepared with different liquid parts (Ga, GaSn) and different ZrO2 addition particle sizes (nano and micro) and their effect on the corrosion resistance of the filling was explored. The solid part was admixed from a low copper alloy and metallic glass of silver copper eutectic (1/3rd Low Cu + 2/3rd Ag–Cu eutectic). The low copper alloy comprising 66 wt% Ag, 30 wt% Sn, 4 wt% Cu and Zn was added at a constant weight of 1.2 g per cast. The specimens were prepared according to ADA specification no. 1 and stored at 37±1°C. The corrosion test was carried out according to ASTM standard (G5 – 87) and at 37±1°C. Two types of electrochemical tests were made: Open Circuit Potential (OCP) – time measurements, and potentiodynamic polarization in artificial saliva at 37±1°C. The results obtained show that Ecorr is shifted in the positive direction and the mean corrosion current densities decrease with ZrO2, and with a change from Ga to GaSn.

Keywords: gallium restorative, corrosion, ZrO2, potentiodynamic test, dental material, metallic glass, nano, artificial saliva

Int. J. Corros. Scale Inhib., , 9, no. 3, 1121-1141 PDF (1 329 K)
doi: 10.17675/2305-6894-2020-9-3-22

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