As critical load-bearing structures for photovoltaic (PV) power generation systems, PV mounting structures must withstand long-term exposure to wind loads, erosion from rain and snow, and complex climatic conditions; consequently, the corrosion resistance of the steel used is of paramount importance. Currently, the most common materials on the market are hot-dip galvanized steel and zinc-aluminum-magnesium (Zn-Al-Mg) alloy steel. While hot-dip galvanized steel is characterized by a mature production process, high strength, and excellent cost-effectiveness, Zn-Al-Mg steel offers superior corrosion resistance and self-healing capabilities, making it particularly suitable for coastal, high-humidity, and high-salinity environments. Common anti-corrosion treatments include hot-dip galvanizing, Zn-Al-Mg alloy coating, and powder coating, with the choice depending on project-specific environmental conditions and budget requirements. As global PV installed capacity continues to grow, high-performance, long-lasting mounting materials are emerging as a key industry trend, creating new market opportunities for steel suppliers.