When designing solar mounting structures for coastal environments, material selection is not just about price. The wrong choice can lead to premature corrosion, costly repairs, and project delays. Coastal locations are highly corrosive due to salt-laden air, making proper corrosion protection essential.

ISO 9223 Corrosion Classification

ISO 9223:2012 defines the corrosivity of atmospheric environments, ranging from C1 (very low) to C5-M (very high, marine). Coastal projects typically require C5-M protection, which ensures long-term durability even under harsh conditions. Using lower-grade materials such as C3 or C4 may initially save costs but dramatically increases the risk of corrosion and early maintenance.

Zn-Al-Mg Coatings and Coating Mass

Materials that meet C5-M requirements generally use Zn-Al-Mg coated steel. According to Shougang Steel, for C5-M applications, the coating mass should be 450 g/m², providing superior corrosion resistance compared to standard galvanized coatings. Lower coating masses, while cheaper, cannot withstand the aggressive coastal environment over the expected lifespan of solar installations.

Comparing Corrosion Levels

This comparison highlights why coastal solar projects demand higher-spec materials. Installing structures with insufficient corrosion protection may lead to return visits, structural repairs, or full component replacement within just a few years.

Key Takeaway

Selecting materials for coastal solar installations should prioritize corrosion resistance and coating mass, not just initial cost. Offering materials that meet C5-M standards per ISO 9223 ensures that your project remains safe, durable, and cost-effective over the long term.

For projects in coastal areas, we provide Zn-Al-Mg coated steel with 450 g/m², fully compliant with C5-M requirements. Contact us to ensure your solar mounting structures meet the necessary corrosion protection standards and avoid costly future maintenance.