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

• A.O. Al-Roubaiy¹, H.H.J. Jamal Al-Deen¹ and M.S. Tuma²

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

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