Photovoltaic Mounting System Project for the Fishery-Solar Hybrid Project in Tayang, Qionghai, Hainan

This fishery-photovoltaic complementary project is built on the aquaculture water surface, and its environment features multiple characteristics such as high humidity, strong corrosiveness, high ultraviolet radiation and complex climatic conditions. Due to the intense evaporation from the water surface, the air remains in a high-humidity state all year round. At the same time, corrosive gases produced by the decomposition of organic substances such as ammonia and hydrogen sulfide increase the risk of erosion to the metal support. In the Hainan region, surrounded by the sea on all sides, the wind speed is relatively high, the air humidity is high, and the salt concentration in the sea breeze is high, creating a continuous salt spray corrosion environment. This is particularly prominent in coastal tidal flats, ports, docks and coastal development zones. Therefore, the salt spray components in the air will further accelerate the corrosion of material surfaces. In terms of lighting, the water surface not only receives sunlight but also reflects strong ultraviolet rays, keeping the support under high-intensity radiation for a long time. This can easily lead to coating aging and powdering, reducing the durability of the structure. In addition, water fluctuations, wind force and temperature differences will impose higher requirements on the structural stability of the support system. Once loosening or corrosion damage occurs, the difficulty and cost of maintenance will be much higher than those of onshore projects.

Due to the excellent self-healing ability, superior salt spray resistance effect, and its cost-effectiveness, zinc-aluminum-magnesium (ZAM) coating materials have become the mainstream choice for fishery-solar hybrid projects in recent years. Zinc-Aluminum-Magnesium (ZAM) coated steel offers significant advantages in real usage as structural materials for solar mounting systems in fishery-solar hybrid (agrivoltaic) projects. In this kind of project, environments are characterized by high humidity, corrosive gases, and in salt-laden air, which present severe challenges. ZAM steel provides superior corrosion resistance due to its unique alloy composition. The presence of aluminum and magnesium enables the formation of a dense, self-healing protective layer, even at cut edges and scratches. Compared to standard hot-dip galvanized steel, ZAM can offer 2 to 5 times longer durability in salt spray and high-moisture environments. In addition to its excellent corrosion performance, ZAM maintains strong structural integrity and good formability that makes it be ideal for modular designs and on-site installation over water surfaces. The coating also offers excellent UV resistance effect and keep surface stability, and reducing the risk of coating degradation and minimizing long-term maintenance costs because of that. With its combination of durability, cost-efficiency, and adaptability to extreme environments, ZAM-coated steel has become a preferred material for photovoltaic mounting structures in agrivoltaic projects which help to support system keeping reliability over a 25-year lifespan.