4.1 Article

THE EFFECT OF GLOW DISCHARGE NITRIDING ON THE CORROSION RESISTANCE OF STAINLESS STEEL ORTHODONTIC ARCHES IN ARTIFICIAL SALIVA SOLUTION

Journal

ARCHIVES OF METALLURGY AND MATERIALS
Volume 65, Issue 1, Pages 375-384

Publisher

POLSKA AKAD NAUK, POLISH ACAD SCIENCES, INST METALL & MATER SCI PAS
DOI: 10.24425/amm.2020.131740

Keywords

steel orthodontic arch-wires; artificial saliva; glow-discharge nitriding; corrosion resistance

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The oral cavity due to its temperature fluctuations, changing pH, high humidity, action of mechanical forces and the presence of microorganisms is a favorable environment for degradation of dental materials. The paper presents comparative results on orthodontic arch-wires AISI304 steel before and after low temperature plasma nitriding carried out at cathodic potential (conventional) and at plasma potential, i.e. in a process incorporating an active screen. Corrosion resistance test on nitrided layers produced on stainless steel were carried out via electrochemical impedance spectroscopy (EIS) and the potentiodynamic method in non-deacrated artificial saliva solution at 37 degrees C. The results were complemented with analysis of the structure, surface topography and microhardness. The results showed an increase in corrosion resistance of AISI304 steel after conventional glow-discharge nitriding.

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