Aluminum and its alloys, known for their comprehensive properties such as light weight, high strength, corrosion resistance, electrical and thermal conductivity, and ease of processing, have become indispensable metallic materials in various fields including construction, decoration, aerospace, home appliances, and transportation. Today, let’s explore aluminum and aluminum alloys with Wanzhi Group from multiple perspectives, including the compositional characteristics, mechanical properties, surface treatments, and application scenarios of different aluminum alloy series.
Classification of Aluminum Alloy Types
Aluminum alloy designations use a four-digit system (1xxx-8xxx), where the first digit indicates the primary alloying element. Common series include the 1xxx series, 2xxx (Aluminum-Copper), 3xxx series, 4xxx series, 5xxx series, 6xxx series, 7xxx series, and the 8xxx series for other alloys.
1xxx Series — Pure Aluminum Series
Composition: Aluminum purity ≥ 99.0%.
Characteristics:
- Excellent plasticity, low strength, easy to process and form
- Superior electrical and thermal conductivity
- Strong corrosion resistance, especially in atmospheric environments
- Low strength, not heat-treatable
Representative Grades: 1050, 1060, 1070, 1100
Applications:
- Aluminum coils
- Lighting fixtures
- Aluminum ceiling panels, decorative panels
- Piping, containers, radiators
- Conductive strips, busbars
- Linings for chemical equipment
2xxx Series — Aluminum-Copper Alloys
Composition: Primary alloying element is copper (Cu), typically 2-6%, with small additions of magnesium, manganese, etc.
Characteristics:
- High strength, reaching 400-500 MPa
- Good heat resistance
- Poor corrosion resistance, requires alclad coating or surface protection
- Generally fair weldability, good machinability
Representative Grades: 2011, 2014, 2017, 2024, 2A12
Typical Applications:
- Aerospace structural components
- High-strength load-bearing parts
- Gears, bolts, rivets
- Mold manufacturing, sports equipment
3xxx Series — Aluminum-Manganese Alloys
Composition: Primary alloying element is manganese (Mn), typically 1.0-1.5%.
Characteristics:
- Excellent rust resistance, corrosion resistance superior to pure aluminum
- Good formability, suitable for deep drawing and bending
- Medium to low strength, approximately 20% higher than 1xxx series
Representative Grades: 3003, 3004, 3105
Applications:
- Prepainted aluminum coils, piping
- Aluminum ceiling tiles, suspended ceiling panels, aluminum ceiling panels
- Air conditioner foil, heat sinks
- Beverage can bodies
- Building exterior wall panels, roof panels
- Air conditioner foil
4xxx Series — Aluminum-Silicon Alloys
Composition: Primary alloying element is silicon (Si), typically 4-13%.
Characteristics:
- Low melting point, good fluidity
- Good wear resistance, low thermal expansion coefficient
- Appears gray-black with high silicon content, turns gray-brown after anodizing
Representative Grades: 4032, 4043, 4047, 4A01
Typical Applications:
- Aluminum welding wire
- Automotive pistons, wear-resistant parts
- Architectural decorative panels (dark gray/black finish)
- Radiators, heat exchanger components
- Cladding material for brazing sheets
5xxx Series — Aluminum-Magnesium Alloys
Composition: Primary alloying element is magnesium (Mg), typically 2-5%.
Characteristics:
- Medium to high strength, strength varies with magnesium content
- Excellent corrosion resistance, especially in marine atmospheres
- Good weldability
- Work hardenable
Representative Grades: 5052, 5083, 5754
Typical Applications:
- Aluminum curtain walls, curtain wall back panels
- Ship and yacht structural components
- Automotive fuel tanks, truck body panels
- Pressure vessels, chemical storage tanks
- High-end appliance housings, electronic product enclosures
6xxx Series — Aluminum-Magnesium-Silicon Alloys
Composition: Primary alloying elements are magnesium (Mg) and silicon (Si), forming Mg₂Si strengthening phase.
Characteristics:
- Heat-treatable
- Easily extrudable, suitable for complex cross-section profiles
- Good overall mechanical properties
- Attractive surface finish, easy to anodize and color
Representative Grades: 6061, 6063
Applications:
- 6063: Door and window profiles, curtain wall frames, aluminum tubes, decorative trims, heat sinks
- 6061: Structural parts, brackets, automotive components, machinery parts, molds, bicycle frames
7xxx Series — Aluminum-Zinc Alloys
Composition: Primary alloying element is zinc (Zn), with additions of magnesium, copper, etc.
Characteristics:
- Ultra-high strength, reaching 500-700 MPa
- Aerospace grade material
- Heat-treatable
Representative Grades: 7075
Typical Applications:
- Aerospace structural components
- High-end sports equipment
- High-strength load-bearing parts
Surface Treatments for Aluminum
| Treatment Method | Principle | Characteristics |
| Anodizing | Electrochemical process forming a synthetic oxide film | Film thickness 5-25μm, dyeable, high hardness, corrosion resistant |
| Electrophoretic Coating | Electrophoretic deposition of organic paint | Uniform coating, good weather resistance, moderate cost |
| Powder Coating | Electrostatic spraying of powder paint followed by curing | Wide color range, film thickness 60-120μm, impact resistant |
| PVDF Coating | Spraying with PVDF (Polyvinylidene Fluoride) resin paint | Top-tier weather resistance (20-30 years), self-cleaning properties |
| Film Lamination | Laminating with PVC/PET film | Wood/stone grain effects, realistic tactile feel |
| Brushing/Polishing | Mechanical abrasion | Strong metallic texture, excellent decorative effect |
| Chemical Passivation | Chemical treatment forming a conversion coating | Improves corrosion resistance, used as primer base |
Mechanical Properties Comparison
| Series | Representative Grade | Temper | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Hardness (HB) |
| 1xxx | 1100 | O | 75-110 | 25-35 | 20-30 | 23 |
| 3xxx | 3003 | H14 | 140-180 | 115-150 | 8-16 | 40 |
| 5xxx | 5052 | H32 | 210-260 | 160-200 | 12-18 | 60 |
| 6xxx | 6061 | T6 | 260-310 | 240-280 | 8-12 | 95 |
| 6xxx | 6063 | T5 | 150-200 | 110-160 | 12-16 | 60 |
| 7xxx | 7075 | T6 | 510-570 | 430-500 | 6-11 | 150 |
Advantages of Aluminum
Light Weight & High Strength: Density 2.7 g/cm³, about 1/3 that of steel, reducing transportation and installation costs.
Corrosion Resistant: Naturally forms a dense, protective oxide layer, never rusts in the atmosphere, suitable for humid, coastal, and outdoor environments.
Thermal & Electrical Conductivity: Thermal conductivity approx. 200-240 W/m·K, electrical conductivity approx. 60% IACS.
Easy to Process: Can be extruded, rolled, forged, stamped, welded, and cut.
Aesthetic & Versatile: Can be anodized for color, painted in any color, or finished to imitate wood or stone grain; highly decorative.
Eco-Friendly: 100% recyclable, a green building material.
Non-Magnetic & Non-Toxic: Suitable for food, medical, and electronic industries.
Most Common Grades for Color-Coated Aluminum Coils / Sheets
| Grade | Series | Core Characteristics | Typical Applications |
| 1100 | 1xxx | Pure aluminum, excellent plasticity, good corrosion resistance | Lighting fixtures, decorative panels, chemical piping |
| 3003 | 3xxx | Most common for color-coated coils, moderate strength, good formability, excellent corrosion resistance | Building facades, suspended ceilings, roof panels, appliance housings |
| 3004 | 3xxx | Higher strength than 3003, good deep drawing properties | Beverage can bodies, building exterior wall panels |
| 3105 | 3xxx | Good balance of strength and formability | Pre-painted roof sheets, wall panels, portable buildings |
| 5052 | 5xxx | High strength, resistant to marine climates | Ship interiors, chemical equipment, high-end curtain walls |
| 5754 | 5xxx | Good weldability, high strength | Automotive parts, pressure vessels |
| 6061 | 6xxx | High strength, heat-treatable | Structural parts, frames, molds |
Selection Guide for Color-Coated Aluminum Coils
| Application Scenario | Recommended Grade(s) | Recommended Coating | Thickness Range |
| Indoor Ceilings / Panels | 1100, 3003 | Polyester (PE) | 0.3-0.8 mm |
| Building Curtain Walls / Exteriors | 3003, 3105 | PVDF (Fluorocarbon) | 0.5-1.5 mm |
| Roofing / Corrugated Sheets | 3003, 3004 | HDP (High Durability Polyester) | 0.4-1.0 mm |
| Appliance Panels | 3003, 5052 | PE / SMP + Protective Film | 0.3-0.8 mm |
| Marine / Offshore Environments | 5052, 5083 | PVDF | 1.0-3.0 mm |
| Decorative Trims / Profiles | 6063 | Anodizing / Painting | Custom |
Wanzhi Group provides a full range of aluminum raw materials, from the pure and soft 1xxx series to the ultra-high strength 7xxx series. At the same time, we focus on the R&D and production of color-coated aluminum coils/sheets. Based on mainstream grades like 3003 and 5052, and utilizing our full range of PE, HDP, and PVDF coatings, we offer high-quality, multi-color, and customized aluminum solutions to customers worldwide.