The Experts below are selected from a list of 61026 Experts worldwide ranked by ideXlab platform
Amauri Garcia - One of the best experts on this subject based on the ideXlab platform.
-
Electrochemical Corrosion behaviour of a Ti‐IF steel and a SAE 1020 steel in a 0.5 M NaCl solution
Materials and Corrosion, 2009Co-Authors: Wislei R. Osório, Leandro C. Peixoto, Amauri GarciaAbstract:Investigations concerning the Electrochemical Corrosion behaviour of low carbon (LC) and ultra-low carbon (ULC) steels are relatively scarce and limited. The present study aims to compare Electrochemical impedance parameters and potentiodynamic polarization curves of an LC steel and an ULC Ti-interstitial free (IF) steel evidencing the effects of carbon content and pearlite fraction on the Electrochemical Corrosion behaviour. Corrosion tests were carried out in a 0.5 M NaCl solution at 25 °C with a pH range between 6.5 and 6.8. It was found that the IF steel sample presents an Electrochemical Corrosion resistance, which is slightly higher than that of the LC steel sample.
-
Electrochemical Corrosion of Pb-1 wt% Sn and Pb-2.5 wt% Sn alloys for lead-acid battery applications
Journal of Power Sources, 2009Co-Authors: Wislei R. Osório, Leandro C. Peixoto, Amauri GarciaAbstract:Abstract The aim of this study was to compare the Electrochemical Corrosion behavior of as-cast Pb–1 wt% Sn and Pb–2.5 wt% Sn alloy samples in a 0.5 M H2SO4 solution at 25 °C. A water-cooled unidirectional solidification system was used to obtain the as-cast samples. Electrochemical impedance spectroscopy (EIS) diagrams, potentiodynamic polarization curves and an equivalent circuit analysis were used to evaluate the Electrochemical Corrosion response. It was found that a coarse cellular array has a better Electrochemical Corrosion resistance than fine cells. The pre-programming of microstructure cell size of Pb–Sn alloys can be used as an alternative way to produce as-cast components of lead-acid batteries with higher Corrosion resistance associated with environmental and economical aspects.
-
Electrochemical Corrosion behavior of a ti 35nb alloy for medical prostheses
Electrochimica Acta, 2008Co-Authors: Alessandra Cremasco, Wislei R. Osório, Amauri Garcia, C M A Freire, R CaramAbstract:Abstract Since the 1980s, the titanium alloys show attractive properties for biomedical applications where the most important factors are, firstly, biocompatibility, Corrosion and mechanical resistances, low modulus of elasticity, very good strength to weight ratio, reasonable formability and osseointegration. The aim of this study was to investigate the effects of two different heat treatments; furnace cooling and water quenching, on the general Electrochemical Corrosion resistance of Ti–35 wt%Nb alloy samples immersed in a 0.9% NaCl (0.15 mol L −1 ) solution at 25 °C and neutral pH range. The samples were obtained using a non-consumable tungsten electrode furnace with a water-cooled copper hearth under argon atmosphere. The microstructural pattern was examined by scanning electron microscopy (SEM) and X-ray diffractometry (XRD). In order to evaluate the Electrochemical Corrosion behavior of such Ti–Nb alloy samples, Corrosion tests were performed by using Electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization curves. Analyses of an equivalent circuit have also been used to provide quantitative support for the discussions and understanding of the Corrosion behavior. It was found that water quenching provides a microstructural pattern consisting of an alpha-martensite acicular phase which decreases the material Electrochemical performance due to the stress-induced martensitic transformation.
Wislei R. Osório - One of the best experts on this subject based on the ideXlab platform.
-
Electrochemical Corrosion behaviour of a Ti‐IF steel and a SAE 1020 steel in a 0.5 M NaCl solution
Materials and Corrosion, 2009Co-Authors: Wislei R. Osório, Leandro C. Peixoto, Amauri GarciaAbstract:Investigations concerning the Electrochemical Corrosion behaviour of low carbon (LC) and ultra-low carbon (ULC) steels are relatively scarce and limited. The present study aims to compare Electrochemical impedance parameters and potentiodynamic polarization curves of an LC steel and an ULC Ti-interstitial free (IF) steel evidencing the effects of carbon content and pearlite fraction on the Electrochemical Corrosion behaviour. Corrosion tests were carried out in a 0.5 M NaCl solution at 25 °C with a pH range between 6.5 and 6.8. It was found that the IF steel sample presents an Electrochemical Corrosion resistance, which is slightly higher than that of the LC steel sample.
-
Electrochemical Corrosion of Pb-1 wt% Sn and Pb-2.5 wt% Sn alloys for lead-acid battery applications
Journal of Power Sources, 2009Co-Authors: Wislei R. Osório, Leandro C. Peixoto, Amauri GarciaAbstract:Abstract The aim of this study was to compare the Electrochemical Corrosion behavior of as-cast Pb–1 wt% Sn and Pb–2.5 wt% Sn alloy samples in a 0.5 M H2SO4 solution at 25 °C. A water-cooled unidirectional solidification system was used to obtain the as-cast samples. Electrochemical impedance spectroscopy (EIS) diagrams, potentiodynamic polarization curves and an equivalent circuit analysis were used to evaluate the Electrochemical Corrosion response. It was found that a coarse cellular array has a better Electrochemical Corrosion resistance than fine cells. The pre-programming of microstructure cell size of Pb–Sn alloys can be used as an alternative way to produce as-cast components of lead-acid batteries with higher Corrosion resistance associated with environmental and economical aspects.
-
Electrochemical Corrosion behavior of a ti 35nb alloy for medical prostheses
Electrochimica Acta, 2008Co-Authors: Alessandra Cremasco, Wislei R. Osório, Amauri Garcia, C M A Freire, R CaramAbstract:Abstract Since the 1980s, the titanium alloys show attractive properties for biomedical applications where the most important factors are, firstly, biocompatibility, Corrosion and mechanical resistances, low modulus of elasticity, very good strength to weight ratio, reasonable formability and osseointegration. The aim of this study was to investigate the effects of two different heat treatments; furnace cooling and water quenching, on the general Electrochemical Corrosion resistance of Ti–35 wt%Nb alloy samples immersed in a 0.9% NaCl (0.15 mol L −1 ) solution at 25 °C and neutral pH range. The samples were obtained using a non-consumable tungsten electrode furnace with a water-cooled copper hearth under argon atmosphere. The microstructural pattern was examined by scanning electron microscopy (SEM) and X-ray diffractometry (XRD). In order to evaluate the Electrochemical Corrosion behavior of such Ti–Nb alloy samples, Corrosion tests were performed by using Electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization curves. Analyses of an equivalent circuit have also been used to provide quantitative support for the discussions and understanding of the Corrosion behavior. It was found that water quenching provides a microstructural pattern consisting of an alpha-martensite acicular phase which decreases the material Electrochemical performance due to the stress-induced martensitic transformation.
F R Marciano - One of the best experts on this subject based on the ideXlab platform.
-
effect of gold oxide incorporation on Electrochemical Corrosion resistance of diamond like carbon
Diamond and Related Materials, 2015Co-Authors: Ciliana Antero Guimaraes Da Silva Oliveira, M F Stein, E Saito, Hudson Zanin, Lais Helena S Vieira, Leandro Raniero, V J Travaairoldi, Anderson Oliveira Lobo, F R MarcianoAbstract:Abstract Gold oxide nanoparticles were incorporated into diamond-like carbon (DLC) films in order to improve protection of AISI-1020 from Electrochemical Corrosion. The AuOx:DLC films were prepared by plasma enhanced chemical vapor deposition and were subsequently characterized by scanning electron microscopy, Raman spectroscopy and electrochemistry measurements. The Electrochemical Corrosion performance of the AuOx:DLC coating was contrasted to AISI-1020 and DLC without AuOx coating. The Electrochemical techniques that were utilized for this investigation were potentiodynamic and electrochemistry impedance spectroscopy. The Electrochemical analysis indicated that AuOx:DLC films presented superior Corrosion resistance as compared to DLC. This resulted in 99.8% and 96.8% protection efficiency respectively, when compared to AuOx:DLC and DLC coatings.
-
Diamond-like carbon Electrochemical Corrosion resistance by addition of nanocrystalline diamond particles for biomedical applications
Surface and Coatings Technology, 2014Co-Authors: B.c. Ramos, E Saito, Anderson Oliveira Lobo, Vladimir Jesus Trava-airoldi, F R MarcianoAbstract:Abstract Combining chemical and mechanical properties of diamond-like carbon (DLC) films opens the possibilities for its use in Electrochemical applications. DLC Electrochemical Corrosion behavior is heavily dependent on deposition techniques and precursor gas. In this paper, nanocrystalline diamond (NCD) particles were incorporated into DLC films to study NCD-DLC Electrochemical Corrosion resistance in biomedical area. The films were grown over 316 L stainless steel using plasma enhanced chemical vapor deposition. NCD particles were incorporated into DLC during the deposition. Raman scattering spectroscopy and scanning electron microscopy characterized NCD-DLC structure and morphology. Electrochemical Impedance Spectroscopy and potentiodynamic method investigate NCD-DLC Electrochemical Corrosion behavior in simulated body fluid. The presence of NCD particles increases the DLC Corrosion resistance. However, as the NCD concentration increases, the disorder also increases. Therefore, DLC films at lower concentration of NCD particles had the maximum Corrosion resistance. From these results, NCD-DLC films can be considered a potential candidate for an antiCorrosion material in biomedical applications.
-
Crystalline diamond particles into diamond-like carbon films: The influence of the particle sizes on the Electrochemical Corrosion resistance
Surface & Coatings Technology, 2010Co-Authors: F R Marciano, E. C. Almeida, D.a. Lima-oliveira, Evaldo José Corat, Vladimir Jesus Trava-airoldiAbstract:Abstract Crystalline diamond (CD) particles are incorporated into diamond-like carbon (DLC) films in order to prevent CD–DLC Electrochemical Corrosion. In this paper, the influence of the diamond particle sizes on the Electrochemical Corrosion resistance of CD–DLC films was investigated. The films were grown over 304 stainless steel using plasma enhanced chemical vapor deposition. CD particles with 4 nm, 250 nm, 500 nm and 2–3 µm in diameter were incorporated into DLC during the deposition process. The investigation of CD–DLC Electrochemical Corrosion behavior was performed using potentiodynamic method. The results show that both protection efficiency and impedance increase with the decrease of I D / I G ratio. It means the increase of sp 3 bonds in DLC films reduces its Electrochemical Corrosion, improving the Electrochemical protection efficiency and the impedance. Our results pointed out that CD–DLC films are promising Corrosion protective coatings in aggressive solutions.
-
Improvement of DLC Electrochemical Corrosion resistance by addiction of fluorine
Diamond and Related Materials, 2010Co-Authors: F R Marciano, E. C. Almeida, D.a. Lima-oliveira, Evaldo José Corat, Vladimir Jesus Trava-airoldiAbstract:The combination of chemical and mechanical properties of diamond-like carbon (DLC) films opens the possibilities for its use in Electrochemical applications. DLC Electrochemical Corrosion behavior is heavily dependent on deposition techniques and precursor gas. Fluorinated-DLC combines the superlative properties of diamond and teflon and becomes one of the most suitable coating for tribological applications. F-DLC was grown over 316L stainless steel using plasma enhanced chemical vapor deposition by varying the ratio of carbon tetrafluoride and methane. The influence of fluorine content on deposition rate, composition, bonding structure, surface energy, hardness, stress, and surface roughness was investigated. Emphasis was placed on the investigation of F-DLC Electrochemical Corrosion behavior, which was tested by potentiodynamic method. As F content increased, F-DLC films presented lower stress, hardness values and surface free energy. In addition, Raman G-band peak position shifted to higher frequency. The Corrosion potential becomes more negative and the anodic and cathodic current densities decreased with the increase of F content, as compared to the pure DLC and the substrates. These results were confirmed by Nyquist plot, which shows a stronger ohmic behavior for F-DLC and Bode plots with different Corrosion behaviors. The Electrochemical analysis indicated F-DLC films present superior impedance, polarization resistance and breakdown potential as compared to the pure DLC, which indicate they are promising Corrosion protective coating in aggressive solutions.
-
Improvement of diamond-like carbon Electrochemical Corrosion resistance by addition of nanocrystalline diamond
Journal of colloid and interface science, 2009Co-Authors: F R Marciano, E. C. Almeida, Evaldo José Corat, L.f. Bonetti, Vladimir Jesus Trava-airoldiAbstract:Nanocrystalline diamond (NCD) particles were incorporated into diamond-like carbon (DLC) films in order to investigate NCD-DLC Electrochemical Corrosion resistance. The films were grown over 304 stainless steel using plasma-enhanced chemical vapor deposition. NCD particles were incorporated into DLC during the deposition process. The investigation of NCD-DLC Electrochemical Corrosion behavior was performed using potentiodynamic polarization against NaCl. NCD-DLC films presented more negative Corrosion potential and lower anodic and cathodic current densities. The Electrochemical analysis indicated that NCD-DLC films present superior impedance and polarization resistance compared to the pure DLC, which indicate that they are promising Corrosion protective coatings in aggressive solutions.
Vladimir Jesus Trava-airoldi - One of the best experts on this subject based on the ideXlab platform.
-
Diamond-like carbon Electrochemical Corrosion resistance by addition of nanocrystalline diamond particles for biomedical applications
Surface and Coatings Technology, 2014Co-Authors: B.c. Ramos, E Saito, Anderson Oliveira Lobo, Vladimir Jesus Trava-airoldi, F R MarcianoAbstract:Abstract Combining chemical and mechanical properties of diamond-like carbon (DLC) films opens the possibilities for its use in Electrochemical applications. DLC Electrochemical Corrosion behavior is heavily dependent on deposition techniques and precursor gas. In this paper, nanocrystalline diamond (NCD) particles were incorporated into DLC films to study NCD-DLC Electrochemical Corrosion resistance in biomedical area. The films were grown over 316 L stainless steel using plasma enhanced chemical vapor deposition. NCD particles were incorporated into DLC during the deposition. Raman scattering spectroscopy and scanning electron microscopy characterized NCD-DLC structure and morphology. Electrochemical Impedance Spectroscopy and potentiodynamic method investigate NCD-DLC Electrochemical Corrosion behavior in simulated body fluid. The presence of NCD particles increases the DLC Corrosion resistance. However, as the NCD concentration increases, the disorder also increases. Therefore, DLC films at lower concentration of NCD particles had the maximum Corrosion resistance. From these results, NCD-DLC films can be considered a potential candidate for an antiCorrosion material in biomedical applications.
-
Crystalline diamond particles into diamond-like carbon films: The influence of the particle sizes on the Electrochemical Corrosion resistance
Surface & Coatings Technology, 2010Co-Authors: F R Marciano, E. C. Almeida, D.a. Lima-oliveira, Evaldo José Corat, Vladimir Jesus Trava-airoldiAbstract:Abstract Crystalline diamond (CD) particles are incorporated into diamond-like carbon (DLC) films in order to prevent CD–DLC Electrochemical Corrosion. In this paper, the influence of the diamond particle sizes on the Electrochemical Corrosion resistance of CD–DLC films was investigated. The films were grown over 304 stainless steel using plasma enhanced chemical vapor deposition. CD particles with 4 nm, 250 nm, 500 nm and 2–3 µm in diameter were incorporated into DLC during the deposition process. The investigation of CD–DLC Electrochemical Corrosion behavior was performed using potentiodynamic method. The results show that both protection efficiency and impedance increase with the decrease of I D / I G ratio. It means the increase of sp 3 bonds in DLC films reduces its Electrochemical Corrosion, improving the Electrochemical protection efficiency and the impedance. Our results pointed out that CD–DLC films are promising Corrosion protective coatings in aggressive solutions.
-
Improvement of DLC Electrochemical Corrosion resistance by addiction of fluorine
Diamond and Related Materials, 2010Co-Authors: F R Marciano, E. C. Almeida, D.a. Lima-oliveira, Evaldo José Corat, Vladimir Jesus Trava-airoldiAbstract:The combination of chemical and mechanical properties of diamond-like carbon (DLC) films opens the possibilities for its use in Electrochemical applications. DLC Electrochemical Corrosion behavior is heavily dependent on deposition techniques and precursor gas. Fluorinated-DLC combines the superlative properties of diamond and teflon and becomes one of the most suitable coating for tribological applications. F-DLC was grown over 316L stainless steel using plasma enhanced chemical vapor deposition by varying the ratio of carbon tetrafluoride and methane. The influence of fluorine content on deposition rate, composition, bonding structure, surface energy, hardness, stress, and surface roughness was investigated. Emphasis was placed on the investigation of F-DLC Electrochemical Corrosion behavior, which was tested by potentiodynamic method. As F content increased, F-DLC films presented lower stress, hardness values and surface free energy. In addition, Raman G-band peak position shifted to higher frequency. The Corrosion potential becomes more negative and the anodic and cathodic current densities decreased with the increase of F content, as compared to the pure DLC and the substrates. These results were confirmed by Nyquist plot, which shows a stronger ohmic behavior for F-DLC and Bode plots with different Corrosion behaviors. The Electrochemical analysis indicated F-DLC films present superior impedance, polarization resistance and breakdown potential as compared to the pure DLC, which indicate they are promising Corrosion protective coating in aggressive solutions.
-
Improvement of diamond-like carbon Electrochemical Corrosion resistance by addition of nanocrystalline diamond
Journal of colloid and interface science, 2009Co-Authors: F R Marciano, E. C. Almeida, Evaldo José Corat, L.f. Bonetti, Vladimir Jesus Trava-airoldiAbstract:Nanocrystalline diamond (NCD) particles were incorporated into diamond-like carbon (DLC) films in order to investigate NCD-DLC Electrochemical Corrosion resistance. The films were grown over 304 stainless steel using plasma-enhanced chemical vapor deposition. NCD particles were incorporated into DLC during the deposition process. The investigation of NCD-DLC Electrochemical Corrosion behavior was performed using potentiodynamic polarization against NaCl. NCD-DLC films presented more negative Corrosion potential and lower anodic and cathodic current densities. The Electrochemical analysis indicated that NCD-DLC films present superior impedance and polarization resistance compared to the pure DLC, which indicate that they are promising Corrosion protective coatings in aggressive solutions.
Li Rongde - One of the best experts on this subject based on the ideXlab platform.
-
Effects of Ni on the Electrochemical Corrosion behavior of ZA35 alloy
Ordnance Material Science and Engineering, 2011Co-Authors: Li RongdeAbstract:The effects of Ni on the Electrochemical Corrosion behavior of ZA35 alloy in 3.5% NaCl solution were studied by Electrochemical Corrosion tests and microstructure analysis.The results show that the element Ni can refine-grain and change thick-dendrite-microstructure into agglomerated microstructure.The primary elongated dendrite arm becomes short,thick-and round.The microstructure of ZA35 alloy can be refined after the addition of 0.5% Ni(mass fraction),the Corrosion current density is reduced and the Corrosion resistance of the alloy is enhanced obviously.