Corrosion resistance of orthodontic wire made of Gold 18K alloy in artificial saliva in the presence of Éclairs milky candy

• N. Anitha¹, A. Uma Maheswari², L. Ilakiya¹, J. Arun Joency¹, K. Bhuvaneswari¹, G. Gomathi¹, M. Lavanya¹, S. Susithra¹, X. Susmitha¹, S. Rajendran^1,3, V. Velkannan⁴, G. Singh⁵ and C. Lacnjevac⁶

¹ PG Department of Chemistry, Corrosion Research Centre, St. Antony’s College of Arts and Sciences for Women, Dindigul 624005, India
² Department of Chemistry , PSNA College of Engineering and Technology (Autonomous), Dindigul, India
³ Adjunct Professor, Centre for Nanoscience and Technology, Pondicherry University, Puducherry 605014, India
⁴ Department of Chemistry, Thiagarajar College of Engineering, Thiruparankundram, Tamil Nadu 625015, India
⁵ Vice Chancellor, Pondicherry University, Puducherry 605014, India
⁶ Faculty of Agriculture, University of Belgrade, Nemanjina 6, Beograd 11080, Serbia

Abstract: Corrosion resistance of an orthodontic wire made of Gold 18K alloy immersed in artificial saliva in the absence and presence of 500 ppm of Éclairs milky candy has been investigated by polarization study and AC impedance spectroscopy. It is observed that corrosion resistance of Gold 18K alloy immersed in artificial saliva in the presence of 500 ppm of Éclairs milky candy increases. Hence it is concluded that people clipped with orthodontic wire made of Gold 18K alloy need not worry about taking Éclairs milky candy orally. When Gold 18K alloy is immersed in artificial saliva in the presence of 500 ppm of Éclairs milky candy, Linear Polarization Resistance value increases from 4.84·10⁶ Ohm·cm² to 9.34·10⁶ Ohm·cm²; corrosion current decreases from 7.73·10^–9 A/cm² to 3.57·10^–9 A/cm²; charge transfer resistance value increases from 1.72·10⁵ Ohm·cm² to 2.16·10⁵ Ohm·cm²; impedance value increases from 5.48 to 5.78 Log(Z/Ohm); double layer capacitance decreases from 2.70·10^–11 F/cm² to 2.36·10^–11 F/cm², and phase angle increases from 44.68° to 45°. It is therefore concluded that people clipped with orthodontic wire made of Gold 18K alloy need not hesitate to take Éclairs milky candy orally. The findings of this study may find application in pediatric dentistry. The surface morphology of films formed on Gold 18K has been analyzed by AFM. It is inferred that (i) for Polished Gold 18K in AS + Éclairs milky candy, the AFM parameters are very low. This is due to the smoothness of the protective film formed on Gold 18K surface, (ii) for Polished Gold 18K in AS the AFM parameters are very high. This is due to the formation of corrosion products on Gold 18K surface, and (iii) for Polished Gold 18K system the AFM parameters are in between those of the two systems.

Keywords: corrosion resistance, gold 18 K alloy, artificial saliva, Éclairs milky candy, polarization study, AC impedance spectra, pediatric dentistry

Int. J. Corros. Scale Inhib., 2023, 12, no. 2, 664-678
doi: 10.17675/2305-6894-2023-12-2-15

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