7178 aluminum coil is a high-strength aluminum–zinc–magnesium–copper alloy in the 7000 series. It offers ultra-high strength, good fatigue resistance, and reasonable corrosion resistance. It is mainly used in aerospace, transportation, and high-performance engineering applications where strength is critical.
Description
Yutwin New Materials specializes in the production of aluminum coils and sheets in a wide range of alloys, grades, and specifications, offering stable quality, flexible customization, and reliable supply to meet the diverse needs of different industries.
Features
- Very high mechanical strength
Stronger than 7075 and 7050, suitable for aerospace, military, and high-load structural applications.
- Good corrosion resistance
Provides excellent resistance to atmospheric corrosion; enhanced corrosion resistance can be achieved with proper heat treatment and coating.
- Good formability and workability
Can be rolled, bent, stamped, and extruded for medium-to-thin gauge applications.
- Lightweight material
Low density helps reduce overall weight while maintaining structural integrity.
- Smooth and uniform surface finish
Ideal for anodizing, painting, coating, or film lamination for both decorative and functional purposes.
- Good weldability
Compatible with TIG and MIG welding under p
Specifications
| Item | Specification |
|---|---|
| Alloy / Grade | 7178 |
| Chemical Composition (%) | Al ≥ 87.5, Zn 5.6–6.6, Mg 2.0–2.5, Cu 1.0–1.6, Cr 0.18–0.25, Ti ≤ 0.15, Fe ≤ 0.5, Si ≤ 0.4, Others ≤ 0.05 |
| Series | 7000 Series (Al-Zn-Mg-Cu Alloy) |
| Temper | T6, T73, T76 |
| Thickness (mm) | 2 – 100 |
| Width (mm) | 500 – 2500 |
| Length (mm) | 1000 – 12000 (Customizable) |
| Surface Finish | Mill Finish, Anodized, Painted |
| Standard | GB/T 3880, ASTM B209, EN AW-7178 |
Common Aluminum Surface Treatments
Polishing
Polishing uses mechanical grinding, chemical, or electrochemical methods to improve the smoothness and brightness of aluminum surfaces. Polished aluminum features a high-gloss finish and excellent decorative appearance.
Brushing
Brushing is a surface treatment process that creates fine, directional textures on aluminum using abrasive belts or brushes. The brushed surface provides a refined metallic appearance while helping conceal minor scratches.
Coating
Coating applies a protective coating onto the aluminum surface through powder coating, liquid spraying, or other coating methods. It provides excellent weather resistance, corrosion protection, and a wide range of color options. Coated aluminum offers both decorative appeal and long-term durabilit.
Anodizing
Anodizing is an electrochemical process that forms a dense oxide layer on the aluminum surface, improving corrosion resistance, wear resistance, and surface hardness. The oxide layer can also be colored to achieve various finishes.
Sand Blasting
Sand blasting uses high-speed abrasive particles to impact the aluminum surface, creating a uniform matte texture. This process provides a soft metallic appearance, reduces fingerprint marks, and improves coating adhesion for subsequent finishing processes.
Embossing
Embossing is a process that forms raised or recessed patterns on aluminum surfaces through rolling or stamping. Common patterns include stucco, diamond, and wood grain textures. Embossed aluminum offers excellent decorative effects, scratch resistance, and certain anti-slip properties.
Applications
- Aerospace and aviation components
Widely used in aircraft fuselage, wings, landing gear, and other critical structural components due to ultra-high strength and excellent fatigue resistance.
- Military and defense applications
Suitable for armored vehicles, military aircraft, missile components, and other high-strength defense structures.
- Transportation and automotive parts
Applied in high-load structural parts of trucks, buses, and high-performance vehicles where strength-to-weight ratio is critical.
- Structural engineering
Used for bridges, cranes, and other load-bearing structures requiring very high mechanical strength and lightweight material.
- Marine applications
Suitable for ship and boat structures where high strength and moderate corrosion resistance are required.
- General fabrication and forming
Ideal for rolling, stamping, bending, and extrusion of medium-to-thin gauge sheets for structural or functional purposes.
