Why does the material of the Aluminum Middle Circle have lightweight and corrosion-resistant characteristics?

The lightweight and corrosion-resistant properties of the Aluminum Middle Circle primarily stem from the inherent characteristics of aluminum metal itself. Here is a detailed explanation:
Low density: Aluminum has a relative density of 2.7, much lower than many other common metals such as iron (7.87), copper (8.96), and steel (7.85). This low-density characteristic means that aluminum products are much lighter in weight for the same volume. For example, an aluminum container or middle ring would weigh only about one-third of an iron equivalent with the same volume. This lightweight feature gives aluminum products a significant advantage in many fields, particularly where weight reduction or transportation cost reduction is crucial. In the cosmetics packaging industry, the low density and lightweight properties of Aluminum Middle Circles are especially important. Since cosmetics require lightweight packaging for ease of carrying and use, Aluminum Middle Circles are an ideal material choice. They not only provide stable support and protection for cosmetics but also do not add excessive weight, making the overall packaging more lightweight and portable.
Formation of aluminum oxide film: The excellent corrosion resistance of aluminum products is mainly attributed to the natural formation of a dense aluminum oxide film on the surface. This film is formed through a chemical reaction between aluminum and oxygen in the air and possesses high chemical stability. It tightly adheres to the surface of aluminum products, preventing external media (such as moisture, oxygen, acidic or alkaline solutions, etc.) from directly contacting the aluminum substrate, effectively preventing further oxidation or corrosion of aluminum. The formation of this aluminum oxide film is a natural process that requires no additional treatment or maintenance. It not only provides long-term protection for aluminum products but also enhances their surface hardness and wear resistance. This makes Aluminum Middle Circles widely applicable in the cosmetics packaging industry as they effectively protect cosmetics from environmental corrosion and contamination.
Electrochemical properties: In addition to the naturally formed aluminum oxide film, aluminum also possesses excellent electrochemical properties. When aluminum comes into contact with other metals or electrolytes, it forms a potential difference that keeps the aluminum surface in a protected state. This phenomenon, known as "electrochemical protection" or "cathodic protection," further slows down or prevents aluminum corrosion. In the cosmetics packaging industry, the electrochemical properties of Aluminum Middle Circles are also crucial. Since cosmetics may contain some corrosive ingredients (such as certain acidic substances), Aluminum Middle Circles need to have good corrosion resistance to ensure their long-term use is not compromised. The electrochemical properties of aluminum enable Aluminum Middle Circles to remain stable in such environments, providing long-term protection for cosmetics.
Surface treatment: To further enhance the corrosion resistance and heat resistance of Aluminum Middle Circles, they are typically subjected to surface treatment. Anodizing enhances their corrosion resistance by forming a thicker and denser aluminum oxide film on the surface. This film not only prevents external media from directly contacting the aluminum substrate but also increases the surface hardness and wear resistance of aluminum products. Additionally, anodizing can produce different colors and textures on the surface of aluminum products. By adjusting the process parameters and conditions of anodizing, different colors and textures can be achieved to meet the aesthetic and personalized requirements of the cosmetics packaging industry. This treatment can make the surface of Aluminum Middle Circles more aesthetically pleasing and fashionable, enhancing the added value and competitiveness of products.
In summary, the lightweight and corrosion-resistant properties of Aluminum Middle Circles are mainly due to the low density, high chemical stability, and excellent electrochemical properties of aluminum metal itself, along with appropriate surface treatments to further enhance their corrosion resistance. These characteristics make Aluminum Middle Circles widely used in various fields, including cosmetics packaging.