Product details table:

Physical and chemical properties:

Physical properties

Appearance:

Aluminum coils typically present a silvery-white metallic color with a smooth and bright surface. Different surface effects can be achieved through various surface treatment processes, such as mirror polishing, brushing, anodizing, or coating.

Density:

The density of aluminum is relatively low, approximately 2.70g/cm³, making it about one-third the density of steel. This lightweight characteristic makes aluminum coils highly desirable for applications where weight reduction is critical.

Melting point:

The melting point of aluminum is relatively low compared to other metals, generally around 660℃. This allows for easier processing during manufacturing while maintaining stability in moderately high-temperature environments.

Coefficient of thermal expansion:

The coefficient of thermal expansion of aluminum is relatively moderate, approximately 23.1×10⁻⁶/℃ (at room temperature). This property ensures that aluminum coils maintain dimensional stability in environments with temperature fluctuations.

Thermal conductivity:

Aluminum has excellent thermal conductivity, with a thermal conductivity coefficient of about 205-250W/(m・K), which is significantly higher than stainless steel and comparable to some copper alloys. This makes aluminum coils suitable for heat exchange and thermal management applications.

Electrical conductivity:

Aluminum exhibits good electrical conductivity, approximately 37.7×10⁶ S/m, which is about 60% of that of copper. This property makes it widely used in electrical applications, especially where weight savings are important.

Chemical properties

Corrosion resistance:

Aluminum forms a natural oxide layer on its surface when exposed to air, providing excellent corrosion resistance. This oxide layer prevents further oxidation and protects the metal from environmental factors such as moisture and oxygen. Aluminum performs well in atmospheric and marine environments but may require additional protective coatings in highly corrosive conditions.

Antioxidation:

Aluminum has good oxidation resistance due to its ability to form a stable oxide layer. However, at very high temperatures, prolonged exposure may lead to increased oxidation, so protective measures like coatings are often applied for high-temperature applications.

Chemical stability:

In general, aluminum exhibits good chemical stability and does not react easily with most chemicals. However, it can be affected by strong acids (e.g., hydrochloric acid) and alkalis (e.g., sodium hydroxide), which can lead to corrosion.

Passivation:

The natural passivation of aluminum occurs when exposed to air, forming a thin but durable oxide layer. This layer enhances the material’s corrosion resistance and can be further improved through anodizing or chemical treatments.

Application:

Aluminum coils are widely used across various industries due to their lightweight, corrosion resistance, and excellent thermal and electrical conductivity. In construction, they are used for roofing, cladding, and insulation materials. In the automotive industry, aluminum coils are utilized in body panels and structural components to reduce vehicle weight and improve fuel efficiency. In HVAC systems, they are employed in heat exchangers and air conditioning units due to their superior thermal conductivity. Additionally, aluminum coils are indispensable in the packaging industry for making beverage cans and foil wraps. In electrical engineering, they are used in power transmission lines and electronic components, offering a cost-effective alternative to copper.