With the rapid development of science and technology, electronic products have become an indispensable part of our lives. And aluminum alloy shell has been widely used in the manufacture of electronic products due to its lightweight, robustness and good heat dissipation performance. However, in the pursuit of product performance at the same time, electromagnetic shielding effect has also become an important factor that can not be ignored. In this paper, the electromagnetic shielding effect of aluminum alloy shell after anodic oxidation and powder coating treatment is compared and analyzed.
Electromagnetic shielding principle of aluminum alloy shell
The electromagnetic shielding principle of aluminum alloy shell is mainly based on its good electrical conductivity. Electromagnetic waves in the propagation process when encountering conductive materials, will produce energy loss, thus weakening the propagation of electromagnetic waves. Aluminum alloy, as a metal material with excellent conductivity, can effectively prevent the propagation of electromagnetic waves and protect the internal electronic equipment from external electromagnetic interference.
Anodizing treatment and electromagnetic shielding effect
Anodic oxidation is a commonly used surface treatment technology for aluminum alloys. Through electrochemical methods, a dense layer of aluminum oxide film is formed on the surface of aluminum alloy. This oxide film not only improves the corrosion resistance of the aluminum alloy, but also gives it a unique decorative effect. However, in terms of electromagnetic shielding, anodic oxidation treatment may bring certain negative effects.
Since the anodic oxide film itself is not conductive, it will weaken the conductivity of the aluminum alloy shell to a certain extent, thus affecting its electromagnetic shielding effect. Although the internal aluminum alloy still maintains good conductivity, the presence of the surface oxide film will cause electromagnetic waves to encounter a certain resistance in the propagation process, reducing the electromagnetic shielding effect.
Powder Coating Treatment and Electromagnetic Shielding Effect
Compared with anodizing, powder coating is a more flexible surface treatment method. Through electrostatic spraying technology, the powder coating is evenly sprayed on the surface of aluminum alloy to form a protective film. This protective film not only has good decorative properties, but also improves the electromagnetic shielding effect of aluminum alloy to a certain extent.
In the coating used for powder coating, additives with conductivity or electromagnetic shielding properties can be added. These additives can effectively absorb and reflect electromagnetic waves and reduce the propagation ability of electromagnetic waves. Therefore, the aluminum alloy shell treated by powder coating shows better performance in electromagnetic shielding.
Conclusion
In summary, there is a certain difference in the electromagnetic shielding effect of aluminum alloy shell after anodic oxidation and powder coating treatment. Although anodic oxidation treatment improves the corrosion resistance and decorative properties of aluminum alloy, it weakens its electromagnetic shielding effect to a certain extent. The powder coating treatment can improve the electromagnetic shielding effect of aluminum alloy shell by adding additives with conductivity or electromagnetic shielding properties.
In practical application, the appropriate surface treatment method should be selected according to specific needs. For electronic products that require high electromagnetic shielding effect, it is recommended to use powder coating treatment; and for more emphasis on corrosion resistance and decorative properties of the occasion, you can choose anodic oxidation treatment.
