The influence of oxygen amount in oral cavity media on the corrosion behavior of nanostructures formed on anodized Zr (original) (raw)
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Corrosion behavior of zirconia in acidulated
Anie THOMAS, Sathyanarayanan SRIDHAR, Shant AGHYARIAN, Pilanda WATKINS-CURRY, Julia Y. CHAN, Danieli C. RODRIGUES, 2016
Methods: Zirconia rods were immersed in 1.23% and 0.123% APF solutions and maintained at 37°C for determined periods of time. Surfaces of all specimens were imaged using digital microscopy and scanning electron microscopy (SEM). Sample mass and dimensions were measured for mass loss determination. Samples were characterized by powder X-ray diffraction (XRD) to detect changes in crystallinity. A biosensor based on electrochemical impedance spectroscopy (EIS) was used to detect ion dissolution of material into the immersion media. Results: Digital microscopy revealed diminishing luster of the materials Although no structural change was found, the absorption of salts (sodium phosphate) greater change of impedance for the immersion solutions with increasing bathing time. Conclusion: Immersion of zirconia in APF solutions showed deterioration limited to the surface, not extending to the bulk of the material. Inferences on zirconia performance in acidic oral environment can be elucidated from the study.
Corrosion behavior of zirconia in acidulated SKRVSKDWH¿XRULGH
2016
Methods: Zirconia rods were immersed in 1.23% and 0.123% APF solutions and maintained at 37°C for determined periods of time. Surfaces of all specimens were imaged using digital microscopy and scanning electron microscopy (SEM). Sample mass and dimensions were measured for mass loss determination. Samples were characterized by powder X-ray diffraction (XRD) to detect changes in crystallinity. A biosensor based on electrochemical impedance spectroscopy (EIS) was used to detect ion dissolution of material into the immersion media. Results: Digital microscopy revealed diminishing luster of the materials Although no structural change was found, the absorption of salts (sodium phosphate) greater change of impedance for the immersion solutions with increasing bathing time. Conclusion: Immersion of zirconia in APF solutions showed deterioration limited to the surface, not extending to the bulk of the material. Inferences on zirconia performance in acidic oral environment can be elucidated from the study.
Electrochemical stability and cell response of nanostructures elaborated on zirconium
Materials and Corrosion, 2018
The paper studies the electrochemical stability in physiological serum and cell response of nanostrucures obtained on Zr by anodizing in electrolytes containing fluorinated ethylene glycol and various amounts of K 2 CO 3. SEM analysis revealed that the porous nanostructure formation is greatly influenced by the various K 2 CO 3 concentrations in the electrolyte by tipping the balance between oxide formation and dissolution during the anodizing process. The porosities of the samples were evaluated from polarization resistances recorded in physiological serum. Chronoamperometric measurements were employed to establish a range of compactness for the samples. It was found that the amount of K 2 CO 3 from the electrolyte is directly responsible in obtaining oxide strata more resistant to corrosion. All tests performed on the samples such as corrosion, hydrophylicity and cell viability with MC3T3-E1 pre-osteoblasts cells from mouse bones revealed that the best coating for future research regarding nanostructured Zr implants was the one obtained from the electrolyte containing the highest amount of K 2 CO 3 .
Metals, 2020
Binary Zr-Ti alloys spontaneously develop a tenacious and compact oxide layer when their fresh surface is exposed either to air or to aqueous environments. Electrochemical impedance spectroscopy (EIS) analysis of Zr-45Ti, Zr-25Ti, and Zr-5Ti exposed to simulated physiological solutions at 37 • C evidences the formation of a non-sealing bilayer oxide film that accounts for the corrosion resistance of the materials. Unfortunately, these oxide layers may undergo breakdown and stable pitting corrosion regimes at anodic potentials within the range of those experienced in the human body under stress and surgical conditions. Improved corrosion resistance has been achieved by prior treatment of these alloys using thermal oxidation in air. EIS was employed to measure the corrosion resistance of the Zr-Ti alloys in simulated physiological solutions of a wide pH range (namely 3 ≤ pH ≤ 8) at 37 • C, and the best results were obtained for the alloys pre-treated at 500 • C. The formation of the passivating oxide layers in simulated physiological solution was monitored in situ using scanning electrochemical microscopy (SECM), finding a transition from an electrochemically active surface, characteristic of the bare metal, to the heterogeneous formation of oxide layers behaving as insulating surfaces towards electron transfer reactions.
Electrochemical Corrosion Behavior of Dental/Implant Alloys in Artificial Saliva
Journal of Materials Engineering and Performance, 2008
The corrosion behavior and passive film characteristics of various dental alloys such as Co-Cr, Ni-Cr, Cu-Ni-Al, and commercially pure Ti (c.p. Ti) were evaluated in artificial saliva medium by utilizing electrochemical impedance spectroscopy (EIS), Tafel polarization, and cyclic polarization studies. EIS studies were carried out for various durations viz. 1 h, 1 day, and 7 days to evaluate the stability of passive film and change in corrosion characteristics with respect to time. Electrochemical parameters such as Ecorr, icorr, corrosion rate, passive film characteristics with respect to time were obtained from various studies mentioned above. The corrosion resistance decreased in the order Cu-Ni-Al > cp Ti > Co-Cr (Commercial) > Ni-Cr > Co-Cr (DRDO developed) in artificial saliva solution.
Applied Surface Science, 2016
The degradation characteristics of hydroxyapatite-zirconia-silver films (HA-ZrO2-Ag) coatings on three ZrTi alloys were investigated in Ringer's solution containing 10% human albumin protein at 37 °C. Samples were immersed for 7 days while monitored by electrochemical impedance spectroscopy (EIS) and linear potentiodynamic polarization (LPP). The electrochemical analysis in combination with surface analytical characterization by scanning electron microscopy (SEM/EDX) reveals the stability and corrosion resistance of the HA-ZrO2-Ag coated ZrTi alloys. The characteristic feature that describes the electrochemical behaviour of the coated alloys is the coexistence of large areas of the coating presenting pores in which the ZrTi alloy substrate is exposed to the simulated physiological environment. The EIS interpretation of results was thus performed using a two-layer model of the surface film. The blocking effect in the presence the human albumin protein produces an enhancement of the corrosion resistance. The results disclose that the Zr45Ti alloy is a promising material for biomedical devices, since electrochemical stability is directly associated to biocompatibility.
Crystals
In the present work, ZrO2-based composites were prepared by adding different amounts of antibacterial magnesium oxide and bioactive and biocompatible hydroxyapatite (HAP) to the inert zirconia. The composites were synthesized by the conventional ceramic processing route and morpho-structurally analyzed by X-ray powder diffraction (XRPD) and scanning electron microscopy/energy dispersive X-ray spectroscopy (SEM/EDS). Two metallic dental alloys (i.e., Ni–Cr and Co–Cr) coated with a chitosan (Chit) membrane containing the prepared composites were exposed to aerated artificial saliva solutions of different pHs (i.e., 4.3, 5, 6) and the corrosion resistances were investigated by electrochemical impedance spectroscopy technique. The obtained results using the two investigated metallic dental alloys shown quasi-similar anticorrosive properties, having quasi-similar charge transfer resistance, when coated with different ZrO2-based composites. This behavior could be explained by the synerget...
Influence of Zirconium on the Corrosion Passivation of Titanium in Simulated Body Fluid
Crystals, 2021
Pure Ti and 85%Ti-15%Zr alloy were sintered in a heat induction high frequency furnace. The corrosion behaviour of Ti and 85%Ti-15%Zr in simulated body fluid (SBF) was studied. The work was achieved using different techniques as the cyclic polarization (PCP), the impedance spectroscopy (EIS), and the change of the potentiostatic current with time (PCT) experiments. The morphology of the surfaces of Ti and Ti-Zr after being corroded in SBF for 72 were investigated by a scanning electron microscope (SEM) and the analysis for the layer formed on that surface was collected via energy dispersive X-ray (EDX). Results depicted that the 15% Zr present within Ti decreases the corrosion via increasing Ti corrosion resistance and minimizing its measured corrosion rate. PCP data proved that the addition of Zr reduced all anodic, cathodic and corrosion currents. EIS results confirmed that Zr has a positive impact on the reduction of corrosion resistance. PCT, SEM, and EDX examinations displayed ...
Electrochemical Corrosion Behavior of a Co20Cr Alloy in Artificial Saliva
International journal of electrochemical science
The corrosion behavior of Co20Cr (at. %) together with 316L stainless steel (SS) in artificial saliva solution during nine immersion days at room temperature have been studied and assessed by means of electrochemical techniques. Techniques included potentiodynamic polarization curves, electrochemical impedance spectroscopy (EIS) and linear polarization resistance (LPR) measurements. Results have shown that the corrosion rate of Co20Cr alloy resulted higher as compared with that of stainless steel 316L biomaterial, using polarization curves. Besides, corrosion potential of Co-20Cr alloy resulted more active. 316 L stainless steel exhibited a more defined passivation zone, while the Co20Cr alloy exhibited a pseudo-passivation zone. Although the pitting potential of binary alloy is higher. The measured values of Rp at the end of the exposure time are related to a higher stability of the film composed by the corrosion products formed on Co20Cr alloy as compared with those of the 316 L SS, which is related to a minor corrosion rate of the CoCr alloy after the third day of immersion. Corrosion behavior is explained in terms of the stability of the corrosion products formed film.
The structure and corrosion barrier performance of nanocrystalline zirconia electrodeposited coating
Corrosion Science, 2009
Zirconia (ZrO 2 ) with the thickness of about 1.5 lm were prepared onto mechanically polished and electrochemically prepared surfaces of 316L stainless steel by direct and pulse current electrodeposition followed by annealing. The ZrO 2 coatings were nanocrystalline with a tetragonal crystallographic structure. The coatings produced by direct current showed a heterogeneous structure in ''cracked-mud" appearance. Pulse current produced a more uniform and dense coating with a strong mechanical barrier property. It also revealed a passive behavior on the Tafel polarization plot. The ZrO 2 coatings produced on electrochemically prepared surfaces showed a very small passive region on Tafel polarization curves.