What should I pay attention to when purchasing Zn-Al-Mg photovoltaic brackets?
Apr 19, 2022
Zinc-aluminum-magnesium is an alloy metal, which refers to an electroplated steel sheet with a certain amount of Al and Mg added to the existing hot-dip galvanized coating. It is an alloy metal with excellent comprehensive properties. Galvanized aluminum magnesium photovoltaic support has the following characteristics:
1. Simple processing, galvanized aluminum-magnesium photovoltaic bracket, direct cutting and use;
Traditional hot dip galvanizing process: workpiece → degreasing → water washing → pickling → water washing → immersion in auxiliary electroplating solvent → drying and preheating → hot dip galvanizing → finishing → cooling → passivation → rinsing → drying → inspection. If the operation of the former process is not good, it will cause a series of adverse reactions in the latter process, and greatly increase the operating cost, or lead to poor hot dip coating of galvanized products.
If the pretreatment is not good, the molten zinc will not fully react with the steel and form the most ideal galvanized film structure. If the latter is not handled well, the appearance of the galvanized film will be damaged and the commodity value will be reduced. Traditional hot-dip galvanizing cutting requires galvanizing, paint repair, surface preparation, and repetitive logistics in between, and the process is cumbersome. Compared with this, direct cutting and use of zinc-aluminum-magnesium-coated stents requires no reprocessing and is lightweight and beautiful.
Therefore, compared with the traditional coating, the zinc-aluminum-magnesium coating reduces a lot of time, manpower, material and financial resources, and is cost-effective!
2. Automatic repair, zinc, aluminum and magnesium will automatically repair the coating on cutting, stamping and profiles;
The reason is that the coating undergoes a chemical reaction in the air. Magnesium ions first form magnesium hydroxide, and then magnesium hydroxide absorbs carbon dioxide to form magnesium carbonate. This substance has a buffering effect on the pH value and reduces the dissolution rate of zinc in water. anode area and inhibit oxidation.
The formation of zinc and magnesium promotes the formation of dense corrosion products and reduces the diffusion rate of dissolved oxygen, thereby reducing the reduction rate of oxygen in the cathode region. Among them, magnesium ions and oxygen ions undergo a redox reaction, and the "white rust" protective layer formed on the stent realizes automatic repair.
Therefore, in the case of cutting, punching and cross-section that damage the coating, the magnesium ion redox reaction will migrate to the damaged part of the coating, forming a dense magnesium carbonate protective film, and the density will not be fatal! repair.
3. Corrosion resistance, the corrosion resistance of zinc-aluminum-magnesium is 5-10 times that of traditional hot-dip galvanizing;
Traditional hot-dip galvanized coatings have many times and red rust on exposed parts in the early stages of corrosion. With the prolongation of corrosion time, the area of red rust will increase; the film "white rust" is a dense protective layer formed on the stent, which can achieve self-healing effect.
As a result, zinc, aluminum and magnesium coatings can achieve better corrosion resistance and less coating adhesion compared to conventional products, saving material and time. It has better protection for the cutting edge of the steel plate, the welded part and the part where the coating is damaged due to severe deformation.
