Pre-painted Aluminium Coil 7050 For Automobile
In the rapidly evolving automotive industry, materials that balance strength, corrosion resistance, and aesthetic appeal are crucial. Pre-painted aluminium coils, particularly those made from alloy 7050, are gaining substantial importance for automobile manufacturers worldwide.
What is Pre-Painted Aluminium Coil 7050?
Aluminium Coil 7050 refers to aluminium alloys primarily composed of aluminum, zinc, magnesium, and copper with the grade series “7050” indicating Florida Tech specifications for the alloy class. When subjected to surface treatment and coating, these coils become “pre-painted,” meaning they undergo painting before fabrication, offering enhanced corrosion resistance and superior surface finish.
Functions and Advantages in Automobiles
The 7050 pre-painted aluminium coil offers several advantages:
High Strength and Light Weight: With tensile strength typically around 510-560 MPa in tempered conditions (commonly T7451 or T7651), 7050 alloy excels in performance-intensive parts like car body frames, chassis parts, and structural components where high strength-to-weight ratio is essential.
Corrosion Resistance: The alloy’s composition, combined with protective pre-painted layers using advanced coating technology (like epoxy or PVDF), grants excellent resistance against environmental corrosion – a crucial factor in automotive parts exposed to harsh weather.
Superior Surface Finish: Pre-painting ensures consistent, durable, and customizable finish that improves aesthetic appeal without the need for additional painting in manufacturing lines, reducing time and cost.
Formability and Machinability: 7050 can be cold rolled or formed into complex shapes due to its controlled alloy temper and pre-treated surface, enabling the fabrication of intricate body panels and interior trim.
Technical Details and Parameters
| Parameter | Specification |
|---|---|
| Alloy | 7050 |
| Temper | T7451, T7651, T7652 |
| Thickness | 0.2mm – 3.0mm |
| Width | Customizable, typically 1000mm – 1600mm |
| Tensile Strength | 510 – 560 MPa |
| Yield Strength | 440 – 490 MPa |
| Elongation at Break | 6 – 10% |
| Density | ~2.83 g/cm³ |
| Modulus of Elasticity | ~71.7 GPa |
Chemical Composition of Alloy 7050 (Weight %)
| Element | Content (%) |
|---|---|
| Zn | 5.6 – 6.4 |
| Mg | 2.0 – 2.6 |
| Cu | 2.0 – 2.6 |
| Fe | ≤ 0.5 |
| Cr | 0.18 – 0.28 |
| Si | ≤ 0.12 |
| Ti | ≤ 0.03 |
| Mn | ≤ 0.10 |
| Al | Balance |
Alloy Tempering Explained
The alloy temper states such as T7451 and T7651 optimize the mechanical and corrosion-resistant properties through heat treatment:
T7451: Solution heat-treated, stress-relieved by stretching, and then artificially aged to enhance resistance to stress corrosion cracking and provide a good balance of strength and toughness.
T7651: Improves control over residual stresses introduced during production, making the coil mechanically stable during forming and fabrication.
The choice between temper depends on component design and performance expectations, with heavier structural automobile panels commonly utilizing T7451 temper for its superior performance in corrosion resistance under applied stress.
Implementation Standards in Automotive Manufacturing
Automotive OEMs and supply chain tiers follow heavy specifications ensuring reliability:
ASTM B209: Standard specification for aluminium and aluminium-alloy sheet and plate.
SAE AMS 4125: Covers 7050 aluminium alloy sheet and plate in specific tempers for aviation and automotive requirements.
ISO 9001/TS 16949: Quality management requirements ensuring batch traceability, consistency, and performance criteria catering to automotive manufacturers.
AAMA 2605 & 2604: Standards referencing coating performance, durability, and appearance - vital for pre-painted coils.
Applications in Automobile Segment
Due to its premium properties, pre-painted aluminium coil 7050 is predominantly used for:
Exterior Body Panels: Offers weight reduction for overall vehicle efficiency while maintaining structural strength to withstand impacts.
Chassis and Frame Components: Leads to enhanced load bearing capacity and crash absorption while resisting corrosion from road salts and moisture.
Engine Components and Heat Shields: Due to excellent strength at elevated temperatures and corrosion resistance.
Interior Trim and Decorative Elements: Superior pre-painted finish reduces further finishing need and enhances the aesthetic variability.
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