Comparative corrosion behavior of different types of electrodes in orange juice, tea and honey solutions for the usage in dental applications

Attia, Enas Mohamed; Abou Shahba, Rabab Mohamed; Abou Koffa, Fatma Mokhtar

doi:10.21608/ijtar.2025.346369.1102

Comparative corrosion behavior of different types of electrodes in orange juice, tea and honey solutions for the usage in dental applications

Document Type : Original Article

Authors

¹ Chemistry Department, Faculty of Science (Girls), Al-Azhar University, Nasr City, Cairo, Egypt

² Additives and Miscellaneous Department at Central Public Health Laboratories - Ministry of Health

10.21608/ijtar.2025.346369.1102

Abstract

The corrosion effect of natural orange fruit juice, tea and honey solutions on the corrosion of Au, Nb, Mo, and CoCr-alloy electrodes has been investigated to determine which material is best suited for use in each environment. The samples of the three solutions were subjugated to different Egyptian standard specifications and did not exceed the permissible limits. Open circuit potential (OCP) and potentiodynamic polarization (PDP) techniques were used. In OCP technique, the potential was measured at different intervals of times for a total exposure of 90 minutes, and the rest potentials (E_res) were determined. The obtained results revealed that the values of E_res had a characteristic order at each temperature, and its values in all solutions decrease with increasing temperature for Au, Mo, and CoCr-alloy electrodes. Under PDP technique, the corrosion rates (C_R) for all electrodes rose as the temperature increased. In orange juice, the electrodes follow this descending order at all temperatures: Nb > CoCr-alloy > Mo > Au. In tea and honey solutions the descending order was: CoCr-alloy > Nb > Mo > Au, at all temperatures. The apparent activation energies and the enthalpies of the corrosion process were positive in all conditions, reflecting the endothermic nature of the dissolution process for all electrodes, except for Mo in honey solutions. Values of entropy for all electrodes equaled to -197 J/mol K.

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