Ti-6al-4v Gr5 Titanium Surface Wear And Corrosion Resistance

Surface coating technology
On the surface of the substrate material using the appropriate process for processing, composite coating and substrate material, so that the substrate surface to produce a protective coating, in chemical, thermal and other aspects have good performance. The corrosion and heat resistance of the surface coating can be used to enhance product performance and provide a long service life in subsequent use. At present, the use of vapor deposition, fusion cladding and other methods of surface coating technology can effectively improve the wear resistance of titanium alloys, corrosion resistance also has a good effect. The organic integration of surface activation and hydrogenation treatment can effectively improve the surface conductivity of titanium alloys, but also to avoid contact with, for example, soft rain, etc., resulting in material corrosion problems. The use of vapor deposition technology, TA2, TC11 substrate made of TiAIN film layer, the film layer and the substrate combined part of the formation of the three elements combined with each other metallurgical bonding, and effectively enhance the performance of various types of substrates.

Surface Nano-treatment
As a new surface treatment technology, nano treatment can be realized without changing the surface material composition of titanium and titanium alloys under the premise of the use of physical, chemical and other means, the material needs to deal with the position of the upper layer of the grain depth refinement until the nanometer level, to fundamentally solve the problem of fatigue resistance on the surface of the material to enhance the surface of titanium and titanium alloys to improve corrosion resistance, and also improve the wear-resistant performance in the practical application. The surface of titanium and titanium alloys can also improve the wear resistance in practical applications. The use of supersonic particle bombardment method, etc., the processing tool and the workpiece surface for the full effect, so that the titanium and titanium alloy surface grains are broken by mechanical methods, the depth of the refinement of the surface to be strengthened. The use of high-energy shot peening surface nanosizing technology for TC4 ensures that the grain size is close to 20 nm, and the hardened layer with a surface hardness higher than that of the raw material improves the fatigue resistance of the material. In the case of TA2, the grain size is close to 30 nm in the nano-surface layer, and the grains in the surface layer form deformation twins that can enhance the hardening degree of the material. Especially in China in 623K conditions in titanium and titanium alloy treatment is stronger than the United States relevant norms, is currently the leading level of the cause. The use of supersonic particle bombardment method, the Ti-6Al-4V alloy treatment, can be derived from the surface of the nano-isometric organization, with 20nm grain size, so that the surface of the alloy compared to the raw material hardness can be increased by more than double.

Surface diffusion and ion implantation
Different from the surface nano treatment, surface diffusion and ion implantation will be metal or non-metallic materials doped in the titanium alloy matrix material, change its surface organization composition, with the help of modified layer to enhance the titanium alloy matrix surface resistance, or the use of aluminum, molybdenum and other metal materials for diffusion, so as to improve the titanium alloy matrix wear resistance and corrosion resistance. Using the mesh cathode glow discharge method, the Ta on the surface of the TC4 substrate penetration plating, can effectively improve the corrosion resistance of the TC4 substrate. The use of solid powder embedding method, the use of the preparation of molybdenum layer, can effectively change the TC6 surface phase structure significantly, so that the TC6 surface hardness increased to 1400HV; At present, in the rapid development of science and technology, vacuum technology theory research and the use of the depth of functionality is also gradually improved, can be derived from the original surface infiltration technology on the basis of a kind of ion implantation technology. For example, by using ion nitriding method, the surface hardness of TA7 titanium alloy can be increased to 1200HV, while by using arc glow ion hydrogen-free carburizing technology to treat the surface of Ti6AI4V alloy, the surface hardness of the alloy can reach 935HV, and it also shows strong wear resistance. Liquid-phase plasma electrolytic carbonitriding technology can also be used to treat Ti6Al4V alloy, so that the surface of the alloy to produce Ti deposition of hard coatings. Increasing the time of treating titanium alloys in this way can effectively increase the thickness of the infiltration layer and improve the wear resistance of titanium alloys.