The difference between hot-dip galvanized steel sheet and electro-galvanized steel sheet is divided into hot-dip galvanized steel sheet (GI) and electrolytic galvanized steel sheet (EG) according to the different galvanizing method, production process and galvanized amount. Their characteristics in various aspects There are big differences:

From the appearance point of view, the surface brightness of EG is better than that of GI, but through the clean surface treatment, GI can also achieve good brightness; a layer of zinc-iron alloy can be formed between the galvanized layer of GI and the steel plate, which can make the galvanized layer The galvanized layer of EG is thinner and cannot form a zinc-iron alloy layer. Therefore, the anti-corrosion and anti-corrosion properties of GI are better than that of EG; the amount of zinc plating of GI can reach more than 45 grams per square meter. The amount of galvanizing is only about 20 grams, and the amount of galvanizing will directly affect the anti-radiation and oxidation resistance of the steel plate. Compared with EG, GI has stronger adsorption to electromagnetic waves, especially low-frequency electromagnetic waves. This material also has better heat dissipation and conductivity, and can effectively resist high-frequency electromagnetic waves。

The electroplated ones are as bright as mercury, and the hot-plated ones are black. Zinc is easily soluble in acid and also soluble in alkali, so it is called amphoteric metal. Zinc hardly changes in dry air. In humid air, a dense basic zinc carbonate film will be formed on the surface of zinc. In sulfur dioxide, hydrogen sulfide and marine atmospheres, zinc has poor corrosion resistance, especially in high humidity and high temperature containing organic acid atmospheres, the galvanized layer is easily corroded. The standard electrode of zinc is -0.76V. For steel, the new coating is an anodic coating. It is mainly used to prevent corrosion of steel, and its protective performance is closely related to the coating. The galvanized layer is passivated. After being dyed or coated with a light protectant, it can significantly improve its protective and decorative properties. In recent years, with the development of galvanizing technology and the use of high-performance galvanized layer brighteners, galvanizing has moved from purely protective purposes to protective decorative applications. The most important one is electroplating. The cost of electrogalvanizing is higher, the surface is good, fingerprint resistance, and corrosion resistance. For the surface products with higher fineness, electrogalvanization is generally used. The biggest difference between the two is that the principle of formation of the zinc layer is different.

Hot-dip galvanizing: the principle of zinc layer formation: zinc-iron alloy layer, pure zinc layer, oxide layer. Electro-galvanizing: The principle of zinc layer formation. Zinc atom deposition, after reaching the atom growth point, the zinc plating layer is formed. The difference between electro-galvanized and hot-dip galvanized: 1. The thickness is different, the electro-galvanized layer is thinner, and the hot-dip galvanized layer is thicker (much thicker); 2. The appearance is different, the electro-galvanized appearance is smooth and bright, and the hot-dip galvanized appearance is rough and shiny. Poor; 3. The application environment is different, electro-galvanizing is used in general occasions, and hot-dip galvanizing is used in outdoor occasions; 4. The protective ability of anti-corrosion is different, and electro-galvanizing is not as strong as hot-dip galvanizing. Application: Electro-galvanizing is used in general anti-corrosion occasions in various industries, and hot-dip galvanizing is used in outdoor occasions requiring strong corrosion resistance.、

 

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