RT info:eu-repo/semantics/article
T1 Multiscale electrochemical investigation of the corrosion resistance of various alloys used in dental prostheses
A1 Souto, Ricardo Manuel
A1 Iacoban, Sorin
A1 Mareci, Daniel
A1 Bolat, Georgiana
A1 Munteanu, Corneliu
K1 Dental alloys
K1 corrosion resistance
K1 passivity
K1 microelectrochemical characterization
K1 SECM
K1 EIS
AB The electrochemical behaviour of Ag-Pd (Paliag), Ni-Cr (Heraenium NA), and Co-Cr (Heraenium CE) alloys used in dental prosthetics construction of crowns and bridges was studied in 0.9% NaCl solution at 25 ºC. The localized electrochemical characteristics related to corrosion resistance and eventual breakdown of the protecting oxide layers were investigated by scanning electrochemical microscopy (SECM), whereas potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques were employed to establish oxide stability. When the corrosion resistance of the alloys was evaluated by means of the corrosion current value determined around their corresponding open circuit potential in 0.9% NaCl solution, good protection can be expected resulting from their spontaneous passivation (low current densities in the order of tenths of μA cm-2). The polarization resistance of all the samples increased with immersion time, in the sequence Ag-Pd < Heraenium NA < Heraenium CE. Yet, increased electrochemical activity was detected with SECM when the alloys were polarized at +0.40 VSCE, a value that may be eventually experienced in the human body. Though a passivation mechanism was still operating in the chromium-containing alloys, oxide dissolution and precipitation of corrosion products occurred on Ag-Pd instead
YR 2015
FD 2015
LK http://riull.ull.es/xmlui/handle/915/19070
UL http://riull.ull.es/xmlui/handle/915/19070
LA en
DS Repositorio institucional de la Universidad de La Laguna
RD 16-abr-2024