Resumo

D'SOUZA, Renita; CHATTREE, A.  e  RAJENDRAN, S.. Corrosion Resistance of an SS 316L Alloy in Artificial Saliva in Presence of a Sparkle Fresh Toothpaste. Port. Electrochim. Acta [online]. 2017, vol.35, n.6, pp.339-350. ISSN 0872-1904.  https://doi.org/10.4152/pea.201706339.

People are implanted with orthodontic wires made of different materials, to regulate their teeth. The various toothpastes that they use during the course of the treatment may have a corrosive effect on these materials. Hence, the main objective of this study was to evaluate the corrosion behaviour of an SS 316L alloy in artificial saliva in the presence of a sparkle fresh toothpaste. An electrochemical study has been used to investigate the corrosion behaviour of this alloy. Scanning electron microscopy (SEM) imaging gave the morphological data for the sample; however, by using X-ray spectroscopy in conjunction with SEM (EDAX), the elemental composition was determined. Further, the analysis of the protective film formed on the metal surface was done using UV-visible absorption and fluorescence spectra. The corrosion resistance of the SS 316L system in various solutions decreases in the following order: AS+ toothpaste> toothpaste>AS. For AS+ toothpaste system, LPR= 1813475 Ohm cm²; Icorr = 2.464 x 10^-8 A/cm²; Rct =14961 Ohm cm²; Cdl= 3.4088 x10^-10 F/cm² and impedance = 4.397 log z/Ohm. The high corrosion resistance offered by the toothpaste is due to the formation of a protective film. It confirmed that the active principles of the toothpaste ingredients have co-ordinated with the SS 316L metal ions through their polar atoms to form a complex.

Palavras-chave : Orthodontic appliances; toothpaste; dental alloys; impedance; resistance; ingredients.

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