Comparative corrosion study of Ag�?�Pd and Co�?�Cr alloys used in dental applications

Bulletin of materials science

D Mareci¹  G Bolat¹  D Sutiman¹  A Cailean¹ 

[1] Technical University “Gh. Asachiâ€�? Iasi, Faculty of Chemical Engineering and Environmental Protection, Bd. D. Mangeron, No. 71, Area code 700050, Iasi, Romania$$Technical University “Gh. Asachiâ€�? Iasi, Faculty of Chemical Engineering and Environmental Protection, Bd. D. Mangeron, No. 71, Area code 700050, Iasi, RomaniaTechnical University “Gh. Asachiâ€�? Iasi, Faculty of Chemical Engineering and Environmental Protection, Bd. D. Mangeron, No. 71, Area code 700050, Iasi, Romania$$

关键词: Dental alloys;    artificial saliva;    corrosion;    EIS;    equivalent circuit.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

The electrochemical behaviour of two Agâ€�?�Pd alloys (Unique White and Paliag) used in dental prosthetics construction for crowns and bridges and one Coâ€�?�Cr alloy (Vitallium 2000) was studied in artificial saliva using the polarization curves and electrochemical impedance spectroscopy (EIS). The corrosion resistance was evaluated by means of the corrosion currents value and by coulometric analysis. The open circuit potential of Agâ€�?�Pd are attributed to dealloying followed by surface enrichment with Ag and the possible formation of an insoluble AgCl surface film on the respective alloy surfaces. Our results have shown that these alloys have a somewhat good corrosion resistance in artificial saliva. The corrosion current densities of Unique White and Vitallium 2000 alloys were very low (∼100 nA/cm²). For Agâ€�?�Pd alloys, when increasing the content of Cu, corrosion resistance decreases. The passivation of all samples occurred spontaneously at the open circuit potential. The electrochemical properties of the spontaneously passivated electrodes at the open circuit potential were studied by EIS. The polarization resistance (ð‘�??_p) and the electrode capacitance (𝐶_dl) were determined. The polarization resistance of all the samples increases with the immersion time. The polarization resistances are largest for Unique White (Agâ€�?�Pd) and Vitallium 2000 (Coâ€�?�Cr) alloys. Because the electrochemical behaviour of the Coâ€�?�Cr alloy was compared with that of Agâ€�?�Pd alloy, this type of alloy may be a suitable alternative for use in the manufacture of fixed dental prostheses. The present study, though limited, has shown that electrochemical characteristics can be used to identify such alloys. Knowledge of the in vitro corrosion behaviour of these alloys may lead to better understanding of any biologically adverse effects in vitro.

【 授权许可】

Unknown