title: Comparative study on corrosion behaviour of Nitinol and stainless steel orthodontic wires in simulated saliva solution in presence of fluoride ions.
abstract: Localized corrosion and effects of pre-passivation treatment of Nitinol and SS304 orthodontic wires in simulated saliva solution in the presence and absence of fluoride ions were investigated by means of potentiodynamic and potentiostatic polarisations. Results revealed that Nitinol does not show pitting corrosion in saliva solution however, SS304 shows pitting corrosion. Meanwhile fluoride ion has deteriorative effect on pitting corrosion of Nitinol, while its effect on SS304 was marginally constructive. Additionally, the presence of artificial crevice has no effect on corrosion behaviour in the presence of fluoride. Pre-passivation treatment has positive influence on pitting corrosion of both alloys in the presence of F(-) ions.
authors.affiliation: Metallurgical and Materials Engineering Department, Faculty of Engineering, Ferdowsi University of Mashhad, Mashhad 91775-1111, Iran.
authors.forename: M
authors.initials: M
authors.lastname: Mirjalili
authors.forename: M
authors.initials: M
authors.lastname: Momeni
authors.forename: N
authors.initials: N
authors.lastname: Ebrahimi
authors.forename: M H
authors.initials: MH
authors.lastname: Moayed
mesh_terms: D000497:Alloys / Q000737:chemistry*; D003343:Corrosion; D055664:Electrochemical Techniques; D004566:Electrodes; D005459:Fluorides / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007477:Ions; D008855:Microscopy, Electron, Scanning; D017942:Nitric Acid / Q000737:chemistry; D009969:Orthodontic Wires; D012464:Saliva, Artificial / Q000737:chemistry*; D012996:Solutions; D013052:Spectrometry, X-Ray Emission; D013193:Stainless Steel / Q000737:chemistry*
chemical_list: D000497:Alloys; D007477:Ions; D012464:Saliva, Artificial; D012996:Solutions; D013193:Stainless Steel; C013616:nitinol; D017942:Nitric Acid; D005459:Fluorides