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The corrosion behaviour of austenitic and duplex stainless steels in artificial saliva with the addition of fluoride
Kocijan, Aleksandra ; Kek-Merl, Darja ; Jenko, Monika, metalurginja
The 2205 duplex stainless steel was investigated as a material for orthodontic bracket fabrication. Orthodontic brackets are essential component of modern fixed appliances. Duplex stainless steels ...balanced with two phases, ferrite and austenite. The combination of both phases has a beneficial influence on the corrosion characteristics in various aqueous environments, thus gradually displacing the stainless steels of the AISI 300 series. The aim of the present study was to compare the electrochemical properties of duplex stainless steel 2205 and AISI 316L stainless steel in artificial saliva and with the addition of sodium fluoride, in order to assess the influence of fluoride mouthwash products on the corrosion resistance of orthodontic brakcets. The evolution of the passive film formed on duplex stainless steel 2205 and AISI 316L stainless steel in artificial saliva and with the addition of sodium fluoride was studied using electrochemical impedance spectroscopy and potentiodynamic measurements. The extent of the passive range significantly increased comparing duplex stainless steel 2205 and AISI 316L stainless steel in both solutions. The passive layers were studied by X-ray photoelectron spectroscopy, and their compositions were analysed as a function of depth. The passive films were formed at open-circuit potential for 168 hours. The passive layers on the surface of both materials predominantly contained Cr-oxides, whereas Fe-species were markedly depleted compared to the bulk concentration. The alloying elements improve the corrosion resistance of duplex stainless steels; however, their content within the passive layer was negligible.
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