Tech Explained | Zinc-Aluminum-Magnesium: The "New Armor" for PV Mounting Systems

The Bottleneck of Traditional Solutions

In the past, hot-dip galvanized steel dominated the PV mounting market, favored for its cost, strength, and mature processing technology. However, this solution has inherent limitations—such as surface defects like zinc buildup and uneven coating thickness. As photovoltaic power plants expand into more corrosive environments—deserts, tidal flats, high-humidity zones, and industrial pollution areas—mounting structures must not only withstand wind and snow loads but also resist salt spray, acid rain, and prolonged UV exposure. Hot-dip galvanized steel is no longer as capable of meeting these harsh demands as it once was.

The Rise of New Materials

The emergence of zinc-aluminum-magnesium (ZAM) has changed the landscape. Grace Solar's ZAM-coated PV mounting products represent a systematic upgrade based on this new alloy coating. It is not simply "adding a bit of aluminum and magnesium to zinc"; rather, it involves applying an alloy coating composed of zinc with carefully adjusted amounts of aluminum, magnesium, and trace silicon onto the steel surface. According to industry-published data, certain ZAM products have achieved over 9,000 hours in neutral salt spray tests without red rust, demonstrating corrosion resistance 10 to 20 times greater than that of conventional hot-dip galvanized steel.

Even more remarkable is the "self-healing" ability of ZAM. The magnesium ions in the ZAM coating possess unique migration and repair properties. When the steel sheet is cut or drilled, these magnesium ions actively migrate to the cut edges, forming a dense protective film that prevents red rust from spreading—completely eliminating the long-standing issue of edge corrosion in galvanized steel. This characteristic also simplifies the production process. ZAM-coated steel leaves the factory with a complete, uniform coating, enabling shorter production cycles and significantly improved efficiency and corrosion protection reliability.

The Invisible Armor

ZAM is becoming the new armor for PV mounting systems. Lighter, more corrosion-resistant, and self-healing, it is being validated by an increasing number of photovoltaic power plants. Grace Solar has already accumulated extensive application experience with ZAM mounts within this growing trend. The competition in PV mounting is no longer just about "who can hold up the load"—it is about "who can hold up longer." On this track, ZAM has yet to meet a true rival.