Hot-dip galvanizing: it is an effective metal anti-corrosion method, mainly used in metal structural facilities in various industries. The rust-removed steel parts are immersed in a molten zinc solution at about 500 ° C, and the zinc layer is adhered to the surface of the steel member, thereby achieving the purpose of anti-corrosion. Hot-dip galvanizing process: finished product pickling-cleaning rust remover-soking Hot-dip galvanizing flux-Hot-dip galvanizing-cooling-Improve the corrosion resistance of zinc surface is completed.
Hot-dip galvanizing is the most widely used steel surface treatment method in the world today with the best performance-price ratio. Hot-dip galvanized products play an inestimable and irreplaceable role in reducing corrosion and longevity of steel and saving energy and materials. At the same time, coated steel is also a high value-added short-term product that the country supports and preferentially develops.
The thickness of the electroplated zinc layer is usually 5 ~ 15μm, while the hot-dip galvanized layer is generally above 35μm, even up to 200μm. The hot-dip galvanizing has good covering ability, the coating is dense, and no organic matter is included. As we all know, the mechanism of zinc's resistance to atmospheric corrosion is mechanical protection and electrochemical protection. Under atmospheric corrosion conditions, the zinc layer has ZnO, Zn (OH) 2, and basic zinc carbonate protective film to slow down the corrosion of zinc to a certain extent. The protective film (also called white rust) will be damaged and a new film will be formed.
When the zinc layer is seriously damaged and endangers the iron substrate, zinc produces electrochemical protection to the substrate. The standard potential of zinc is -0.76V, and the standard potential of iron is -0.44V. When zinc and iron form a micro battery, zinc is dissolved as an anode, iron It is protected as a cathode. Obviously, the hot-dip galvanizing has better atmospheric corrosion resistance to the base metal iron than electro-galvanizing.
The corrosion resistance of hot-dip galvanizing is much higher than that of cold galvanizing (also known as electro galvanizing). Hot galvanizing will not rust in a few years, cold galvanizing will rust in three months.
With the development of industry, hot-dip galvanized products have been used in many fields. The advantage of hot-dip galvanized is that it has a long anti-corrosion period, and it has been a popular anti-corrosion treatment method for adapting to a wide range of environments.
Advantages of hot-dip galvanizing
1.Low processing cost: the cost of hot-dip galvanized anti-rust is lower than the cost of other paint coatings;
2. Durable
3. Good reliability: the galvanized layer and the steel are metallurgically combined and become a part of the steel surface, so the durability of the coating is more reliable;
4. The toughness of the coating is strong: the galvanized layer forms a special metallurgical structure, which can withstand mechanical damage during transportation and use;
5. Comprehensive protection: every part of the plated parts can be plated with zinc, even in the depressions, sharp corners and hidden places can be fully protected;
6. Save time and effort: The galvanizing process is faster than other coating construction methods and can avoid the time required to paint on the construction site after installation.
8. The inspection is simple and convenient: the hot-dip zinc layer can be tested visually and a simple non-destructive coating thickness table for testing
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