Coating of photovoltaic brackets

1. Coating types
The coatings of photovoltaic brackets are mainly divided into two categories: anti-corrosion coatings and decorative coatings. Among them, anti-corrosion coatings are the main type of photovoltaic bracket coatings, which are used to prevent the brackets from being corroded in outdoor environments.

1. Anti-corrosion coatings
Hot-dip galvanizing: Hot-dip galvanizing is an anti-corrosion treatment method that coats the surface of steel materials with a layer of zinc metal. The specific process is to immerse the steel in molten zinc liquid so that a uniform and dense zinc-iron alloy layer is formed on the surface of the steel. This coating has good corrosion resistance and can effectively prevent oxidation and corrosion on the surface of the steel, extending the service life of the product. At the same time, the cost of hot-dip galvanizing process is relatively low and suitable for mass production. However, in extremely harsh environments, a simple hot-dip galvanizing coating may not be enough to provide adequate protection, and other anti-corrosion measures need to be combined at this time.
Zinc-aluminum-magnesium coating: Zinc-aluminum-magnesium coating is a new type of anti-corrosion treatment technology that sprays a layer of zinc-aluminum-magnesium alloy coating on the surface of steel. Compared with hot-dip galvanizing, zinc-aluminum-magnesium coating has stronger corrosion resistance and oxidation resistance, and can better resist corrosion in harsh environments. In addition, the aluminum and magnesium elements in the zinc-aluminum-magnesium coating can form a dense oxide protective layer, which plays a role in self-repair and corrosion resistance, further enhancing the corrosion resistance of the product. At the same time, the zinc-aluminum-magnesium coating also has good environmental performance, without the use of harmful heavy metals.
2. Decorative coating
Decorative coating is mainly used to improve the appearance of photovoltaic brackets and make them more beautiful. Such coatings usually have a variety of colors and glossiness to choose from, and can be customized according to customer needs. However, it should be noted that decorative coatings may not be as good as anti-corrosion coatings in terms of anti-corrosion performance, so the use environment and requirements need to be considered comprehensively when choosing.

2. Coating construction
The construction of photovoltaic bracket coatings needs to follow certain process flows and specifications. The following are some common construction steps:

Surface treatment: Before painting, the surface of the photovoltaic bracket needs to be treated to remove impurities such as rust, oil stains, and oxide scale. Common surface treatment methods include sandblasting, grinding, etc. The quality of surface treatment directly affects the adhesion and anti-corrosion performance of the coating.
Primer coating: Primer is the first layer of coating in the coating system, which is directly applied to the treated substrate. The main function of the primer is to enhance the adhesion between the coating and the substrate and provide a good foundation for subsequent coatings. For different substrates (such as carbon steel, galvanized steel, aluminum alloy, etc.), it is necessary to select a suitable type of primer.
Intermediate paint coating: After the primer is dry, the intermediate paint can be applied. The main function of the intermediate paint is to enhance the anti-corrosion and weathering properties of the coating, while increasing the thickness and strength of the coating. Commonly used intermediate paints include epoxy micaceous iron intermediate paint, etc.
Topcoat coating: The topcoat is the last layer of paint in the coating system, which is directly exposed to the external environment. The main function of the topcoat is to provide a beautiful appearance and certain anti-corrosion properties. Commonly used topcoats include fluorocarbon topcoat, polyurethane topcoat, etc.
3. Coating selection recommendations
When choosing a photovoltaic bracket coating, it is necessary to make a reasonable choice based on the specific use environment and requirements. Here are some suggestions: