Study of Corrosion Resistance of Co-Cr-Mo Surgical Implants Alloy in Artificial Saliva.pdf (original) (raw)
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Study of Corrosion Resistance of Co-Cr-Mo Surgical Implants Alloy in Artificial Saliva
2014
Co-Cr-Mo alloy has been used for biomedical implant for a number of years. In this study, ASTM F-75 Cobalt-base substrate specimen was immersed in artificial saliva at 37 + 1 oC to study the corrosion resistance properties. Surface of specimen before and after the immersion was analyzed by optical microscope and Scanning Electron Microscopy (SEM). X-Ray Diffraction (XRD) was used to study the phase structure present. The metallic ions in the artificial saliva were analyzed after the corrosion test by Absorption Spectrophotometer (AAS). Electrochemical Measurements by polarization experiments were performed to study the corrosion resistance, the main results obtained were expressed in terms of the corrosion potentials (E corr) and corrosion current density (icorr) in addition to measure the Tafel slops by Tafel extrapolation method, and also cyclic polarization are used in artificial saliva solution. The results of galvanic corrosion show that the Co-Cr-Mo alloy had localized corrosi...
Materials Chemistry and Physics, 2019
The pH of saliva is changeable and variable in the oral environment in function of the quality of foods and liquids ingested. Also, the biocompatibility of a material for dental applications is checked not only by clinical and epidemiological studies, but also by corrosion resistance studies. The aim of this study was to investigate the influence of the pH value of artificial saliva on the corrosion of the Co-Cr and Ni-Cr dental alloys, using different electrochemical techniques such as: cyclic voltammetry, open circuit potential (OCP) measurement, polarization curves and electrochemical impedance spectroscopy (EIS). The obtained results are complementary with scanning electron microscopy (SEM) coupled with energy-dispersive X-ray spectroscopy (EDXS) analysis, proving that Co-Cr alloy is more resistant in time, and recommending it for successful treatment of patients with dental prosthesis having metal frameworks.
Collegium antropologicum, 2003
The purpose of this study was to examine how Co-Cr-Mo dental alloy behaves in the solutions of different pH value and different composition over a relatively long period of time. Co-Cr-Mo dental alloy was exposed in vitro to either simulated saliva (phosphate buffer pH 6.0), a highly acidic medium resembling the extreme conditions in the oral cavity (phosphate buffer pH 3.5), and in lactic acid at pH which occurs under the dental plaque (lactic acid pH 3.5). The alloy samples were immersed in these three solution for 1, 2, 3, 4, 5, 6, 7, 14, 21, and 30 days. Solutions were analysed with the ICP-AES. The analysis showed that during one month cobalt (Co), chromium (Cr), iron (Fe), zinc (Zn) and nickel (Ni) ions had been released from tested samples in all three solutions. The results of this study indicate that the leaching of the Co, Cr, Fe, Zn and Ni ions in the solution was dependent both upon the nature of the solution in which the alloy was immersed and the duration of the immers...
International Journal of Electrochemical Science
The purpose of this study was to evaluate the corrosion behaviour of cobalt-chromium dental alloys processed by alternative computer assisted technologies compared to conventional casting technology. Samples obtained by CAD/CAM milling (MIL), Selective Laser Sintering (SLS), Selective Laser Melting (SLM) and conventional melting-casting technology (CAS) were subjected to different electrochemical techniques: linear polarization (LV), cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and chronoelectrochemical studies (chronoamperometry-CA and chronopotentiometry-CP). These methods have been successfully employed in the investigation of various corrosion processes in the field of dentistry. The corrosive electrolyte used for the electrochemical tests was Fusayama artificial saliva with pH values of 5.5, close to the physiological value. The temperature was kept constant at 37ºC. The samples were analysed by scanning electron microscopy (SEM) before and after performing corrosion testing. Computer assisted processing technologies showed promising results, representing a good alternative to traditional manufacturing methods for metallic frameworks for dental prostheses.
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.
Journal of Material Science and Technology Research, 2017
Cobalt-based alloys containing chromium in quantity high enough represent a cheap alternative to dental alloys involving high quantities of noble metals (Au, Pt, Pd…). However, their general corrosion behaviour is not necessarily excellent and their use in the buccal milieu, which supposes contact with saliva, may lead to the release of ions to which the patient may be particularly sensible: allergic reaction, disease due to cobalt ions, associated troubles… In this work it was wished to investigate the electrochemical behaviour of extremely simplified versions of commercial cobalt-based dental alloys in a solution featuring among the ones usually used for simulating saliva. The aim was to explore the possible effects on the corrosion rate of the chromium content and of an eventual plastic deformation issued from fabrication or from mastication. Two binary alloys, Co-15wt.%Cr and Co-30Cwt.%Cr, mounted as electrodes, without or with preliminary hardening in compression, were subjected to EIS and cyclic polarization runs in a threeelectrode cell heated at the human body temperature. Both alloys demonstrated high resistance against corrosion, with Icorr values significantly lower than 1 µA/cm², without real effect of the chromium content (15wt.% seems enough) or of preliminary plastic deformation.
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.
COMPARISON OF THE CORROSION PROPERTIES OF CoCrMo DENTAL ALLOYS IN ARTIFICIAL SALIVA
Materiali in tehnologije, 2021
CoCrMo alloys are known for their biocompatible properties, which, together with their favorable mechanical properties, mean they can be efficiently used in dentistry. With the development of selective laser melting for the fabrication of 3D printed objects, interest in the corrosion properties of this alloy has risen in the field of prosthodontics. In the study, CoCrMoW dental alloys were studied in artificial saliva at body temperature i.e. 37 °C. Different forms of CoCrMoW alloy were selected: a reference sample, i.e. original material as-received from the supplier, a casted sample acquired from an ordinary procedure in a dental laboratory, and two 3D printed samples made from CoCrMoW powder using the selective laser melting method (SLM). Electrochemical, spectroscopic and hardness measurements were conducted. It was shown that the reference and cast samples have similar microstructural and electrochemical properties, while the electrochemical properties of the 3D printed samples...
Rapid Prototyping Journal, 2013
PurposeRapid manufacture‐produced cobalt chromium alloys are beginning to be used in dentistry but there are few published results relating to their properties. The purpose of this paper is to determine the corrosion resistance of a rapid manufacture‐produced dental alloy and compare it to a standard dental casting alloy.Design/methodology/approachIn accordance with ISO 22674, ten samples of each alloy were fabricated in approximately 45 mm×10 mm×2 mm rectangular prisms, a sample number in excess of the standard requirements. The groups were further divided into those with highly polished surfaces and those with electrobrightened surfaces. Each sample was immersed in artificial saliva, suspended by a nylon thread for 42 days at 37°C. Readings for cobalt, chromium and molybdenum ions released into solutions were obtained using an atomic absorption spectrometer at 1, 4, 7, 14, 21, 28, 35, and 42 day intervals at a detection limit of one part per million.FindingsIon release of cobalt, ...
Corrosion Performance of Fe-Cr-Ni Alloys in Artificial Saliva and Mouthwash Solution
Bioinorganic Chemistry and Applications, 2015
Several austenitic stainless steels suitable for high temperature applications because of their high corrosion resistance and excellent mechanical properties were investigated as biomaterials for dental use. The steels were evaluated by electrochemical techniques such as potentiodynamic polarization curves, cyclic polarization curves, measurements of open circuit potential, and linear polarization resistance. The performance of steels was evaluated in two types of environments: artificial saliva and mouthwash solution at 37 ∘ C for 48 hours. In order to compare the behavior of steels, titanium a material commonly used in dental applications was also tested in the same conditions. Results show that tested steels have characteristics that may make them attractive as biomaterials for dental applications. Contents of Cr, Ni, and other minor alloying elements (Mo, Ti, and Nb) determine the performance of stainless steels. In artificial saliva steels show a corrosion rate of the same order of magnitude as titanium and in mouthwash have greater corrosion resistance than titanium.