After the pitch roof solar mounting products are manufactured, in order to prolong the service life of the bracket and avoid frequent replacement due to excessive corrosion, active metals such as galvanized surface are used for protection. There are two kinds of mainstream materials for the coating protection of solar panel brackets: hot-dip galvanized and magnesium-aluminum-zinc-plated. The hot-dip galvanizing method is to pass the prepared pitch roof solar mounting products through a high-temperature zinc solution pool to form a hot-dip galvanized layer to achieve a protective effect. The advantages are low cost, durability, and low time cost;

The method of magnesium-aluminum-zinc plating is basically the same as that of hot-dip galvanizing. The only difference is that a certain proportion of magnesium-aluminum solution is added to the zinc solution pool. The advantage is that compared with hot-dip galvanizing, the life of magnesium-aluminum-zinc plating is improved. 2-3 times higher, and the surface is extremely smooth due to the presence of alumina; the disadvantage is that because the metal activity of aluminum and magnesium is stronger than that of zinc, a large amount of black alumina-magnesium mixture is easily formed on the surface of the bracket, resulting in irregular black dots .