As the global energy transition accelerates, ground-mounted photovoltaic (PV) plants are rapidly expanding into western deserts, coastal tidal flats, and industrial wastelands. However, complex soil compositions, high humidity, and strong wind loads pose severe challenges to the durability of solar mounting structures. Against this backdrop, Hot-Dip Galvanized (HDG) steel has evolved from a mere structural material into a “strategic asset” that ensures the full 25+ year lifecycle performance of PV power plants.

Technological Evolution: From “Coating Protection” to “Alloy Barrier”

Traditional metal anti-corrosion methods often rely on surface paint coatings. But under intense UV radiation and sand abrasion in the field, such coatings are prone to damage, leading to rapid base metal corrosion. In contrast, the hot-dip galvanizing process—immersing pre-treated steel into molten zinc—forms a dense zinc-iron alloy layer through a metallurgical reaction between zinc and iron (source: xmtopenergy.com).

Industry experts point out that this metallurgical bond not only provides mechanical cut-edge protection but, more importantly, offers “cathodic protection.” Even if the mounting structure is scratched during transport or installation, the surrounding zinc layer acts as a “sacrificial anode” and corrodes preferentially, preventing rust from forming at the scratch. This “self-healing” characteristic is unmatched by paint coatings.

Real-World Cases: Proven Reliability in Extreme Environments

The advantages of HDG materials have been repeatedly validated in actual project implementations. A recent noteworthy example is a PV project in Uzbekistan, where a 17.6 MW ground-mounted plant faced challenging site conditions, including complex soil composition, soft ground, and significant slopes.

After comparing multiple options, the project contractor selected a high-durability HDG steel mounting solution. Data from the project showed that the solution not only met the client’s strict requirements for “high cost-effectiveness and fast installation,” but the HDG galvanized piles were also driven directly into the ground without damaging the soil surface, effectively addressing slope challenges. The project achieved grid connection for the first 9.4 MW phase in just two months, demonstrating the high adaptability and installation convenience of HDG mounts in complex geographic conditions.

Furthermore, in a 3 MW ground-mount project in Riyadh, Saudi Arabia, facing extreme wind gusts up to 140 m/s and severe high temperatures, the developer similarly chose HDG carbon steel mounts. The project manager noted that HDG treatment ensures no performance degradation of the steel structure under large temperature fluctuations in the desert environment, providing the “hard strength” needed to resist sandstorms.

Economic Analysis: Lifecycle Cost Advantages

For large-scale ground-mount developers, balancing upfront capital expenditure (CAPEX) with operational expenditure (OPEX) is critical. Although the initial cost of HDG processing is slightly higher than conventional paint treatment, its lifecycle economic benefits are significant.

Industry calculations show that HDG-treated C-section steel or single-pile mounting systems can achieve a service life of 30 years or more with virtually no maintenance. In contrast, ordinary carbon steel mounts often suffer severe corrosion within just 5–7 years in field environments, leading not only to replacement costs but also lost power generation revenue if modules collapse.

This trend is also reflected in a recent technology assessment by PowerChina. Its “low-carbon, environmentally friendly high-strength weathering steel PV mounting construction method” was rated as a domestically leading technology. By using galvanized aluminum-magnesium and hot-dip galvanized steel, the method solves corrosion challenges in mountainous and high-altitude areas while reducing construction difficulty through lightweight design, setting a technical benchmark for green construction.

Future Outlook: Material Innovation Supports Energy Transition

With ongoing breakthroughs in the steel industry, PV mounting steel is advancing toward higher strength and longer service life. HBIS Group Tangsteel recently achieved a new breakthrough in steel for PV mounts: by precisely controlling alloy composition, it produced steel meeting ultra-thick coating requirements, providing high-quality base material for manufacturing lightweight, long-life HDG mounts.

In summary, for ground-mounted PV plants pursuing “safety, reliability, and maintenance-free operation,” hot-dip galvanized steel—with its excellent mechanical properties, top-tier corrosion protection, and significant lifecycle economic advantages—has indisputably become the “ideal choice” for supporting large-scale, high-quality global solar power deployment.