08/24/2026
When specifying coatings for utility scale solar infrastructure, corrosion gets most of the attention. But in dry, windy regions, sand abrasion is an equally important threat β and one that receives far less attention.
A recently published study on solar mounting structures evaluated how hot dip galvanized steel, continuous galvanized steel, and zinc magnesium aluminum alloy coated steel perform under sand erosion conditions. The findings are clear. Despite a slightly higher erosion rate, hot dip galvanized steel lasted approximately 3.58 times longer than continuous galvanized steel and 6.63 times longer than zinc magnesium aluminum alloy coated steel before full coating loss occurred. The reason is coating thickness. HDG provides approximately five times the coating thickness of continuous galvanized steel β and more thickness means more protective material before the underlying steel is exposed.
The study also found that hardness alone does not predict abrasion resistance. The zinc magnesium aluminum alloy coating had the highest hardness and the shortest time to full coating removal.
For solar projects designed to last 25 to 35 years in challenging environments, hot dip galvanizing is the coating built for the long run.
π Read the full article at https://cleanenergysteel.org/2026/03/11/harsh-solar-sites-hdg/