Thermal Spraying Treatment for the Surface of Aluminum Profiles
Surface spraying is a widely used aluminum profile surface protection method. Spraying technology can generally be divided into thermal spraying and cold spraying. The most notable feature is its simple implementation and high efficiency. In this article, we briefly introduce the thermal spraying process for the surface of aluminum profiles.
Thermal spraying is an important technology in the field of surface engineering. First, the sprayed material is heated by a heat source such as flame, plasma, etc. to reach a molten or semi-melted state, and then sprayed and deposited on the surface of the aluminum profiles at a certain speed through a specific equipment to generate a coating of a certain thickness. Thermal spraying technology can quickly and large-scale surface coatings with specific functions, such as thermal barrier, wear-resistant sealing, high-temperature oxidation resistance, conductive insulation, far-infrared radiation resistance, etc. Thermal spraying technology has the advantages of various applicable materials, high work efficiency and low cost.
Thermal spraying can strengthen the surface of aluminum profiles and improve the wear resistance and corrosion resistance of the profile surfaces. Thermal spraying has been used for surface modification of aluminum profiles. Through thermal spraying treatment, the aluminum of the surface coating and the magnesium element of the aluminum-magnesium alloy in the subsurface layer can be interdiffused to form β-Mg17Al12. When the content of β-Mg17Al12 is within a certain range, the mechanical properties of aluminum profiles can be improved and their corrosion resistance can be improved. By thermal spraying aluminum, the pores between the aluminum profile substrate and the coating can also be eliminated, which acts as a closed protective layer. The ceramic coating is formed on the surface by plasma arc spraying. The ceramic coating is far superior to the metal coating in many properties, and the surface hardness, wear resistance and corrosion resistance are significantly improved after treatment. Commonly used surface treatment ceramic materials for aluminum profiles are ZrO2, CrO, TiO2, MgO, Al2O3, etc. Studies have shown that compared with the substrate, the density of the ceramic coating has been significantly improved, the wear resistance has been increased by nearly five times, and the corrosion resistance has also been greatly improved.
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