In the field of industrial materials, pure aluminum and alloy aluminum are widely used in different scenarios due to their unique properties. Below are the core differences and selection recommendations for each:
1. Composition and Performance Comparison
Pure Aluminum (purity ≥ 99.0%)
Advantages: Excellent electrical conductivity (61% IACS), corrosion resistance, and thermal conductivity (237 W/m·K). It is suitable for power transmission, food packaging, and other applications.
Limitations: Low mechanical strength (tensile strength around 90 MPa), easily deformed, and unable to bear heavy loads.
Alloy Aluminum (with added elements such as copper, magnesium, and silicon)
Advantages: Significantly improves mechanical strength through solid solution strengthening (e.g., 6061-T6 with a tensile strength ≥ 310 MPa), offering both wear resistance and high-temperature stability. It is ideal for aerospace, automotive structural parts, and other applications.
Representative Models:
6061 aluminum alloy (general-purpose)
7075 aluminum alloy (ultra-high strength)
5052 aluminum alloy (seawater corrosion-resistant)
2. Typical Application Scenarios
Pure Aluminum
Power Industry: Conductive aluminum busbars, capacitor foil
Food Industry: Food-grade aluminum foil, inner wall of cans
Architectural Decoration: Anodized aluminum plates (for high surface treatment requirements)
Alloy Aluminum
Transportation: Automobile body frames, high-speed rail seat frames
Industrial Equipment: CNC machined parts, hydraulic cylinders
New Energy: Photovoltaic bracket profiles, battery trays
3. Key Selection Indicators
Corrosion Resistance: 5052/5083 aluminum alloys are preferred for marine environments.
Lightweight Strength: 7075-T651 aluminum alloy is ideal for aerospace applications.
Cost-Sensitive Scenarios: 3003 aluminum alloy balances both strength and processing cost.
4. Processing Suggestions
Pure Aluminum: It is important to control the annealing temperature (350-400℃) to prevent grain coarsening.
Alloy Aluminum: For welding, the TIG/MIG process is recommended to avoid element burnout.
