Stock code: 601677
Stock code: 601677
In a photovoltaic (PV) module, the frame plays a critical role far beyond being a simple border. It provides essential structural support to the glass, ensures a lasting seal against moisture, and maintains the module’s integrity under decades of harsh weather. Therefore, choosing the correct frame material is a fundamental decision that impacts the long-term reliability and financial return of any solar power project.
Aluminum alloy stands as the global industry standard for this purpose, thanks to its superior strength-to-weight ratio, excellent corrosion resistance, proven manufacturability, and full recyclability. This guide will delve into the key factors for selecting the right aluminum alloy sheet for solar frame production, helping you make a confident and informed choice.
This is one of the most common questions. Both are heat-treatable alloys, but they have different strengths.
* Alloy 6063 (The Mainstream Choice): Often called the “King of Extrusion.” Its primary advantage lies in excellent extrudability, allowing for the production of complex profiles with smooth surfaces and precise dimensions. It yields a uniform and aesthetically pleasing finish after anodizing, and its corrosion resistance is fully adequate for the vast majority of applications (e.g., standard ground-mounted plants, rooftop distributed generation). It offers the best balance of performance, cost, and manufacturability.
* Alloy 6061 (The High-Performance Option): It offers significantly higher strength (especially tensile and yield strength) than 6063 and better machinability. It is suited for scenarios with extreme structural demands, such as frames for installations in coastal areas with high salt spray, regions with heavy snow/wind loads, or large-scale tracking systems.
Selection Advice: For standard environments, prioritize the cost-effective Alloy 6063. For extreme environments or projects with specific structural design requirements, Alloy 6061 is recommended.
Both the material’s inherent potential and its external protection are critical.
* Temper (Heat Treatment Condition): Common tempers like T5 (cooled from an elevated temperature shaping process and then artificially aged) and T6 (solution heat-treated and then artificially aged) offer different properties. While T6 achieves higher ultimate strength, T5 provides sufficient strength with less distortion during extrusion and better dimensional stability, making it the most prevalent and reliable choice for frame profiles.
* Surface Treatment (Anodizing): This is the critical line of defense for the frame’s weatherability. By creating a dense layer of aluminum oxide on the surface, the material’s corrosion resistance, wear resistance, and UV resistance are vastly improved. The industry standard typically requires a minimum local anodic film thickness of ≥15μm (AA15 grade) to ensure effective protection for 25 years or more.
The thickness of the sheet (directly influencing the wall thickness of the extruded profile) is a primary factor in determining resistance to wind pressure and snow loads. Unnecessarily increasing thickness raises costs, while being too thin poses risks. Common design thicknesses range from 1.4mm to 2.0mm. The optimal thickness must be determined through scientific calculation based on module size, site-specific wind load requirements, and mechanical load tests stipulated in international standards.
Several widespread misconceptions in procurement can directly impact final product performance and cost. Avoiding these “pitfalls” is key to project success.
* Clarification: Properties differ significantly between tempers (e.g., T5 vs. T6) of the same alloy grade (like 6063). For frame applications, the T5 temper offers the best overall combination of strength, formability, and dimensional stability. Blindly opting for T6 can increase costs and processing risks.
* Clarification: Structural strength depends more on profile cross-sectional design. A well-engineered thin-wall profile with optimal rib placement can meet the same mechanical requirements, reducing material cost and enabling lightweighting.
* Clarification: While “primary aluminum” ensures base purity, the final material properties are determined by alloying and precision processing. Consistent melting, homogenization, and heat treatment processes are fundamental to achieving high performance and batch-to-batch uniformity.
* Clarification: Samples can be meticulously controlled. Consistency across large-volume production is the true test. Evaluate a supplier based on their quality management system and proven track record of sustained supply to ensure long-term, reliable performance.
The long-term reliability of a solar panel frame begins with a high-quality aluminum sheet. It defines the inherent capability of the frame to withstand decades of challenges.
Mingtai Aluminum has decades of expertise in aluminum processing. We provide specialized, standardized 6061 and 6063 series aluminum alloy sheets for solar frame manufacturing. Beyond supplying materials that meet stringent standards, we leverage our extensive industry experience to offer scientific selection advice, helping you ensure quality while optimizing overall cost. We aim to be your trusted, long-term partner in the photovoltaic industry.-
Q1: What is the most commonly used aluminum alloy for solar frames?
A: Alloy 6063 is currently the global mainstream choice, offering the best balance of formability, corrosion resistance, strength, and cost. Alloy 6061 is used for environments requiring higher strength.
Q2: How can I ensure an aluminum frame lasts 25+ years?
A: The key lies in the material’s inherent corrosion resistance. Selecting a quality aluminum sheet with compliant chemical composition and undergoing proper anodizing treatment (recommended minimum 15μm film thickness) is fundamental to ensuring long-term resistance to moisture, salt spray, and other harsh environmental factors.
