Abstract:This study aims to investigate the influence of adding a coating layer of austenitic stainless steel type 316L on Ti6Al4V alloy on corrosion behaviour. Samples of 316L, Ti6Al4V, and 316L on Ti6Al4V were prepared by hot-press sintering of their powders. The potentiodynamic polarization technique was used to characterize the corrosion behaviour of the samples in 0.9 and 3.5 wt. % NaCl concentrations. The corrosion potential (Ecorr.), current density (icorr) and corrosion rate (CR) of the sintered samples were co… Show more
“…In actuality, friction between a titanium part and another mechanical part, regardless of the materials in contact, especially for a titanium/titanium contact, intensifies the seizure phenomenon. There are numerous techniques that are frequently used to enhance the surface properties of titanium alloys for wear resistance applications [6], heavy friction condition, including plasma spraying [7], physical vapor deposition (PVD), and chemical vapor deposition (CVD) [8], but their preparation processes are complex, their costs are comparatively high, and their bonding forces are weak. Microarc oxidation (MAO) is a revolutionary surface treatment method that is easy to use, effective, and safe for the environment.…”
As an effective surface modification technique, micro-arc oxidation (MAO) is now widely used to improve the hardness and wear resistance of Ti and its alloys by low-cost and thick ceramic coatings. In this study, molybdenum disilicide (MoSi 2 ) -modified ceramic coatings were deposited on Ti-6Al-4V alloy (340 HV) by MAO using an aqueous solution of Na 2 SiO 3 , (NaPO 3 ) 6 and NaOH and MoSi 2 particles. MoSi 2 particles (3, 5, and 7 g/l) from wastes of furnaces electrodes were introduced into the electrolyte to improve the microstructure and surface properties of Ti-6Al-4V alloys. A scanning electron microscope (SEM), dispersive spectroscopy (EDS), X-ray diffraction (XRD), and mechanical tests (microhardness and wear) were used to identify the coating properties, morphologies, and phases. The findings showed that the addition of 5 g/l MoSi 2 increased the thickness and hardness of MAO coatings from 19.08 µm and 910 HV to 33.12 µm and 1260 HV, respectively. Also, the wear resistance by means of weight losses of uncoated alloys enhanced by 68% and 100% after MAO and 5 g/l MoSi 2 modified-MAO coatings, respectively. Results of this work will promote future works in using of industrial wastes in surface engineering of Ti-6Al-4V alloys by MAO technique for wear resistance applications.
“…In actuality, friction between a titanium part and another mechanical part, regardless of the materials in contact, especially for a titanium/titanium contact, intensifies the seizure phenomenon. There are numerous techniques that are frequently used to enhance the surface properties of titanium alloys for wear resistance applications [6], heavy friction condition, including plasma spraying [7], physical vapor deposition (PVD), and chemical vapor deposition (CVD) [8], but their preparation processes are complex, their costs are comparatively high, and their bonding forces are weak. Microarc oxidation (MAO) is a revolutionary surface treatment method that is easy to use, effective, and safe for the environment.…”
As an effective surface modification technique, micro-arc oxidation (MAO) is now widely used to improve the hardness and wear resistance of Ti and its alloys by low-cost and thick ceramic coatings. In this study, molybdenum disilicide (MoSi 2 ) -modified ceramic coatings were deposited on Ti-6Al-4V alloy (340 HV) by MAO using an aqueous solution of Na 2 SiO 3 , (NaPO 3 ) 6 and NaOH and MoSi 2 particles. MoSi 2 particles (3, 5, and 7 g/l) from wastes of furnaces electrodes were introduced into the electrolyte to improve the microstructure and surface properties of Ti-6Al-4V alloys. A scanning electron microscope (SEM), dispersive spectroscopy (EDS), X-ray diffraction (XRD), and mechanical tests (microhardness and wear) were used to identify the coating properties, morphologies, and phases. The findings showed that the addition of 5 g/l MoSi 2 increased the thickness and hardness of MAO coatings from 19.08 µm and 910 HV to 33.12 µm and 1260 HV, respectively. Also, the wear resistance by means of weight losses of uncoated alloys enhanced by 68% and 100% after MAO and 5 g/l MoSi 2 modified-MAO coatings, respectively. Results of this work will promote future works in using of industrial wastes in surface engineering of Ti-6Al-4V alloys by MAO technique for wear resistance applications.
“…as a result the electrochemical corrosion can be enhanced by pollutants, e.g. chlorine [44] or sulfur [45]. Therefore, in this study, amorphous powder was deposited by low-pressure cold spraying to form an anatase coating on various substrates, with the corrosion resistance of the material pair then being assessed.…”
Corrosion Damage meChanisms of Tio 2 ColD-sprayeD CoaTings cold spraying as a low-temperature coating deposition method is intended for thermally sensitive materials. Due to its precise temperature control, it limits the formation of structural defects, and can therefore be easily applied to spray corrosion protective coatings made from metal or metal-ceramic powders. however, the formation of pure ceramic coatings with the use of cold spraying is still not so common. Titanium dioxide is one of the most interesting ceramics due to its photocatalytic properties. nevertheless, these types of coating materials usually work in a corrosion favoring humid atmosphere. in the presented paper, amorphous Tio 2 powder was deposited onto aluminum alloys and steel substrates and then submitted to potentiodynamic corrosion tests in a 3.5 wt.% nacl solution. The as-sprayed coating showed phase transition from amorphous Tio 2 to anatase, and also revealed porosity. as a result, electrolytes penetrated the coating and caused undercoating corrosion in the tested environment of an aqueous nacl solution. The analysis of the potentiodynamic curves showed that the presence of the coating decreased corrosion potential on both substrates. it arose from the mixed phases of Tio 2 , which consisted of photocathode -amorphous material and photoanode -crystalline anatase. The phase mixture induced the galvanic corrosion of metallic substrates in the presence of electrolytes. Moreover, pitting-like corrosion and coating delamination were detected in aluminium alloy and steel samples, respectively. Finally, the corrosion mechanism of the titanium dioxide coatings was characterized and described.
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