Papers by Keyword: Tribocorrosion

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Authors: Arkadiusz Stachowiak, Wiesław Zwierzycki
Abstract: In recent years, substantial advancements have been made in the methodology of constructing material wear maps [1-3]. The maps make it possible to locate the dominating wear mechanisms in parameterized enforcement areas. The method constitutes a powerful tool for analyzing the mechanisms of material damage, the optimization of material choice and the conditions of use. Recently, the maps of corrosion and erosion wear as the function of the following parameterized enforcements have been made [3]:
Authors: Eliza Dănăilă, Lidia Benea
Abstract: Metallic biomaterial are the most suitable for replacing failed hard tissue up to now and for that is important to know the tribocorrosion resistance of these materials before use in biomedical applications. Surface engineering can play a significant role in extending the performance of medical implants made of titanium and its alloys. In this work was chosen electrodeposition of hydroxyapatite (HA) coatings into nanoporous titania layer formed by anodic oxidation as modified Ti-6Al-4V alloy surface. The comparative tribocorrosion behavior of untreated Ti-6Al-4V alloy surface, anodic nanoporous TiO2 surface and electrodeposited hydroxyapatite (HA) coatings into nanoporous TiO2 layers has been investigated in a bio-simulated fluid solution. The results of these investigations have shown that both surface treatments applied have improved the tribocorrosion resistance and friction coefficients as compared to the untreated Ti–6Al–4V alloy surface.
Authors: Elena Gordo, Roberto G. das Neves, Begoña Ferrari, Antonia Jiménez-Morales, Andreia Lima, Alexandra C. Alves, Ana Maria Pires Pinto, Fatih Toptan
Abstract: This work focuses in the corrosion and wear properties of titanium reinforced with 1% wt. alumina particles, produced by a combination of colloidal techniques and powder metallurgy. The alumina particles were added to control the grain growth of titanium during sintering, and simultaneously to increase hardness and wear resistance. Colloidal techniques permitted a homogeneous dispersion of alumina particles on the surface of fine Ti particles by the formulation of stable aqueous suspensions that were further processed by spray-dry to obtain spherical granules with improved compressibility. Ti-alumina samples were produced by uniaxial pressing of granules and vacuum sintering leading to materials with homogeneous microstructure, a reduction of grain size higher than 50 % with respect to pure titanium, and a sensible increase in hardness. But the addition of ceramic particles can also have an influence on the corrosion behavior that is one of the most interesting properties of titanium alloys, and on wear resistance, that is one of the drawbacks of Ti. Moreover, the study of simultaneous action of wear and corrosion (tribocorrosion) is an area of highest interest in applications like biomedical or automotive. The corrosion behavior was evaluated by Electrochemical Impedance Spectroscopy (EIS) and Potentiodynamic Polarization (PP) in NaCl at two concentrations (0.9 % and 3.5 %) and temperatures (37 oC, and room temperature). Tribocorrosion tests were performed using a reciprocating ball-on-plate tribometer where a 10 mm diameter alumina ball was used as counter material, and 10 N normal load was applied during 30 min in the same concentrations and temperatures of NaCl as in the static corrosion tests. The results showed a clear improvement of wear resistance on the composite without reducing the corrosion behavior in both conditions.
Authors: A. Zieliński, M. Jażdżewska, J. Łubiński, Waldemar Serbiński
Abstract: The titanium and its alloys can be subjected to surface treatment, including laser treatment. In this work a new laser treatment at cryogenic conditions of Ti6Al4V alloy has been described. The work has been aimed at establishing whether such surface treatment could be suitable for implants working under wear in biological corrosive environment. The remelting has been made with the use of CO2 continuous work laser at laser power between 3 and 6 kW, at scan rate 0.5 and 1 m/s. The microstructure, surface topography, hardness, microhardness and wear linear rate and mass loss under tribological tests made in Ringer`s solution have been made. The results have shown that despite the surface cracking the tribological properties in simulated body fluid have been substantially improved.
Authors: Janis Baronins, Vitali Podgursky, Maksim Antonov, Sergei Bereznev, Irina Hussainova
Abstract: TiCN and TiAlN gradient coatings were deposited on the AISI 316L stainless steel substrates by lateral rotating cathode arc (LARC) physical vapour deposition (PVD) technology. Corrosion and tribocorrosion behaviour was studied in 3.5 wt. % NaCl solution. The thickness of coatings was about 3 μm. For both coatings the corrosion potential shifted to more positive values as compared to the uncoated substrate. The corrosion current density decreased for TiCN and TiAlN coatings indicating up to 40 folds higher polarization resistance. The coefficient of friction value of TiCN coating is three times lower and durability is six times higher than that of TiAlN coating under the same tribocorrosion conditions.
Authors: Stefano Mischler, S. Ayrault, D. Landolt
Authors: Liang Shi, Shao Peng Qu, Hai Yan Chen, Yan Sheng Yin, Li Jing Yang
Abstract: The friction, corrosion and tribocorrosion experiments were carried out to study the tribocorrosion characteristics of the D40 steel. Friction process was undertaken using a TriboLab. The electrochemical property of D40 steel was studied using an electrochemical workstation. The surface morphologies of the D40 steel after experiments were characterized by white light interferometry, scanning electron microscopy (SEM) and energy dispersive spectrometry (EDS). The results indicated that both the tribocorrosion and corrosion process of D40 steel under the condition of seawater were controlled by the cathodic oxygen diffusion. The diffusion rate of oxygen in the solution was accelerated by the friction. The phenomenon of Cl ion adsorption was more obvious for the D40 steel during tribocorrosion test, and the corrosion resistance was significantly reduced due to the promotion of friction.
Authors: Babatunde Abiodun Obadele, Anthony Andrews, Peter Apata Olubambi, Mathew Thoppil Mathew, Sisa Pityana
Abstract: The design of tribocorrosion resistant composite on Ti6Al4V alloy by laser surface cladding of admixed metal-ceramic powder was successfully achieved using a 2 kW CW ytterbium laser system (YLS). The effects of TiNiZrO2 addition on the tribocorrosion properties of the synthesized composite coatings were investigated in 1 M H2SO4 solution using open circuit potential and potentiodynamic polarization techniques. The experimental results showed that TiNiZrO2 refined the microstructure to flower-like structure. A strong metallurgical bond was obtained between the coatings and the Ti6Al4V alloy substrate with inter-columnar widmansttaten α΄ grains at the interface. There was a significant increase in surface microindentation hardness values of the clad layers. Also, the presence of zirconia shifted the tribocorrosion potential to more noble values and significantly enhanced the tribocorrosion resistance of the composites.
Authors: Alexandre Velhinho, José D. Botas, Edith Ariza Avila, J.R. Gomes, L.A. Rocha
Authors: J.R. Gomes, A.R. Ribeiro, A.C. Vieira, A.S. Miranda, L.A. Rocha
Abstract: Functionally graded aluminium matrix composites reinforced with SiC particles are attractive materials for a broad range of engineering applications whenever a superior combination of surface and bulk mechanical properties is required. In general, these materials are developed for the production of high wear resistant components. Also, often this kind of mechanical part operates in the presence of aggressive environments, such as marine atmospheres. In this work, aluminium composites with functionally graded properties, obtained by centrifugal cast, are characterised by reciprocating pin-on-plate sliding wear tests against nodular cast iron. Three different volume fractions of SiC reinforcing particles in each functionally graded material were considered. Sliding experiments were performed with and without the presence of a lubricant (3% NaCl aqueous solution). In the case of the lubricated tests, electrochemical parameters (corrosion potential) were monitored during sliding. Friction values were in the order of 0.42 for unlubricated conditions, but varied between 0.22 and 0.37 when the aqueous solution was present. For all test conditions, relatively high wear rates (over 1×10-6 gm-1) were obtained, particularly for the cast iron pin. The volume fraction of SiC particles exerted a net effect on the tribological response of the composites, although conditioned by the presence or absence of the aqueous solution. The worn surface morphology of the composites indicated that the presence of the aqueous solution modifies the protective action promoted by the combined effect of the presence of reinforcing particles as load bearing elements and the formation of adherent iron-rich tribolayers. The evolution of the corrosion potential during the sliding action is in accordance to the degradation mechanisms proposed for these systems.
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