2025-12-10
Using weathering steel as a material for photovoltaic mounting structures eliminates the need for anti-corrosion coating treatment, resulting in faster construction timelines and being environmentally friendly without pollution. Weathering steel, also known as atmospheric corrosion-resistant steel, is a low-alloy steel that falls between ordinary steel and stainless steel. It is made by adding a certain amount of copper, along with corrosion-resistant elements such as phosphorus, chromium, nickel, titanium, and vanadium, to plain carbon steel. It retains the properties of ordinary steel, such as easy ductility, high strength, and fatigue resistance, while offering corrosion resistance that is 2 to 8 times greater than that of plain carbon steel. The corrosion resistance principle is "rust stops rust." Weathering steel only oxidizes on the surface without penetrating deeply, exhibiting anti-corrosion characteristics similar to copper or aluminum. When exposed to natural weathering, the rust layer forms a dense oxide layer between the rust and the base material. The presence of this dense oxide film prevents oxygen and moisture from the atmosphere from penetrating the steel base, thereby enhancing its atmospheric corrosion resistance.
(1) Advantages of Weathering Steel Photovoltaic Mounting Structures
① The first and foremost advantage is cost savings. Since weathering steel eliminates the need for anti-corrosion coating processes, the costs associated with anti-corrosion coating are reduced.
② Shorter production cycles: By eliminating the anti-corrosion coating process, the production cycle for photovoltaic mounting structures is naturally shortened.
③ Environmental friendliness: The absence of initial coating reduces pollution, making weathering steel a "green and eco-friendly" option. It is an economically sustainable type of steel.
(2) Disadvantages of Weathering Steel Photovoltaic Mounting Structures
① Welding difficulties: Weathering steel is an alloy steel, and these alloying elements can interfere with the welding process, increasing the likelihood of weld defects and even reducing the strength of the welded joints, thereby affecting the overall lifespan of the steel structure. Additionally, ensuring the corrosion resistance of welded joints in weathering steel can be challenging. Therefore, the most significant difficulty in manufacturing weathering steel photovoltaic mounting structures lies in the welding process, which requires specialized welding materials and advanced welding techniques.
② Discoloration issue: The rust layer on the surface of weathering steel plates can cause nearby objects to become stained with rust. Maintenance personnel working near the photovoltaic mounting structures may end up covered in rust marks.
③ Water accumulation corrosion issue: Weathering steel is not stainless steel. If water accumulates in recessed areas of weathering steel, the corrosion rate in those areas will accelerate. Therefore, proper drainage must be ensured.
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