Corrosion resistance of orthodontic wire made of SS 18/8 alloy in artificial saliva in presence of Halls menthol candy investigated by electrochemical studies

• N. Anitha¹, P.S.L.M. Kala¹, S. Jothika¹, A.K. Parveen¹, L. Kavibharathi¹, D. Kaviya¹, A.L. Jewelcy¹, H.M. Banu¹, J.M. Prabha¹, A.M. Belsiya¹, G.M. Biruntha¹, S. Rajendran^1,2 and Gurmeet Singh³

¹ Department of Chemistry, Corrosion Research Centre, St. Antony’s College of Arts and Sciences for Women, Dindigul-624005, India
² Adjunct Professor, Pondicherry University, Puducherry, India
³ Vice Chancellor, Pondicherry University, Puducherry, India

Abstract: Doctors make use of orthodontic wires such as SS 18/8, Ni–Cr, Ni–Ti, SS 316, Gold 22 K etc., to regulate the growth of teeth. These wires undergo corrosion in the saliva environment. Apart from this, they undergo corrosion by the juices, food items and Tablets orally taken in. Corrosion resistance of SS 18/8 alloy in artificial saliva (AS), in the absence and presence of Halls menthol candy juice has been investigated by polarization study and AC impedance spectra. It is found that corrosion resistance of SS 18/8 alloy in artificial saliva decreases in the presence of Halls menthol candy. This is proved by decrease in linear polarization resistance (LPR) value, decrease in charge transfer resistance (R_t) value, decrease in impedance value, increase in corrosion current and increase in double layer capacitance value (C_dl). In the presence of Halls menthol candy juice, the LPR value decreases from 5.299∙10⁵ Ohm∙cm² to 2.519∙10⁵ Ohm∙cm². The corrosion current value increases from 7.323∙10^–8 A/cm² to 7.724∙10^–8 A/cm². The charge transfer resistance (R_t) value decreases from 1.231∙10⁴ Ohm∙cm² to 1.187∙10⁴ Ohm∙cm². The double layer capacitance value increases from 4.142∙10^–10 F/cm² to 4.296∙10^–10 F/cm². The impedance value decreases from 4.387 to 4.281 log(Z/Ohm). The phase angle decreases from 43.21° to 42.59°. Therefore, the chances of orthodontic wire made of SS 18/8 alloy undergoing corrosion are greater in those who consume Halls menthol candy juice excessively.

Keywords: orthodontic wires, SS18/8, corrosion resistance, Halls menthol candy juice, artificial (simulated) saliva

Int. J. Corros. Scale Inhib., 2022, 11, no. 1, 353-363
doi: 10.17675/2305-6894-2022-11-1-21

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