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2024-09-04
Development trend of steel structure anti-corrosion materials
Atpresent,theapplicationofnanotechnologyinheavy-dutyanti-corrosionproductsforsteelstructuresisstillinitsinfancy.Therearefewreportsoftheapplicationofsuchproducts......
At present, the application of nanotechnology in heavy-duty anti-corrosion products for steel structures is still in its infancy. There are few reports of the application of such products at home and abroad. However, it is generally believed that the adoption of nanotechnology will undoubtedly bring huge benefits to this field. The reason is simple, because the properties of the surface materials and self-protection corrosion products involved in protection are mainly determined by their microstructures, which involve interface problems, changes in electrochemical processes, transmission behaviors, changes in the strength and plasticity of surface materials, etc. For example, the introduction of certain types of nanoparticles into organic coatings can increase their anti-aging properties, and the plasticity of inorganic coatings can be improved due to the nano-sizing of their structures.
1 Nano-sizing of the main structure of inorganic covering layers In the case of inorganic anti-corrosion coatings or surface treatment layers, certain special methods can be used to make the covering layer present a nanostructure, thereby bringing about a series of changes in the properties of the film layer. Generally, the covering layer is always inert relative to the steel matrix in terms of chemical properties. If you want to achieve good anti-corrosion effects and long-term non-failure, it is required that it has a high bonding strength with the matrix, complete coverage, less porosity and defects, good uniformity, impact resistance, high strength and a certain toughness. Among them, toughness and a certain deformation capacity are important. In many cases, the main reason for the failure of inorganic coatings is their poor toughness. Of course, there is also the total amount of bonding force. The nanostructure will undoubtedly improve the strength of the inorganic coating, thereby improving its ability to resist failure. Due to the increase in deformation coordination, it will also increase its bonding strength with the steel surface. It should also be noted that the general coating anti-corrosion relies on its transmission slowing and interfacial bonding of the medium. Sometimes, by adding appropriate components, it can also have passivation and cathodic protection effects. For these effects, the layering nano-crystallization will inevitably bring beneficial or unhelpful effects.
2 Improvement of the performance of traditional organic coatings By adding certain types of nanoparticles to the coating to form a nanocomposite coating, the performance can be greatly improved. For example, nanoparticles such as TiO2, SiO2, ZnO, and Fe2O3 can significantly improve the aging resistance of organic coatings by scattering ultraviolet rays. In addition, it can also be used to improve the rheology, adhesion, mechanical strength, hardness, finish, light resistance and weather resistance of certain types of coatings. The role of nanoparticles in these aspects is essentially the same for steel structure anti-corrosion coatings and coatings for other purposes. There is relatively more work in this area, but there is still some way to go before it can be effectively applied in heavy corrosion protection.
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