According to the galvanizing method, production process and the amount of galvanizing, it is divided into hot-dip galvanized steel (GI) and electrolytic galvanized steel (EG), they differ greatly in their properties: From the appearance point of view, the surface brightness of EG is better than that of GI, but GI can also achieve good brightness through clean surface treatment. 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 firmer, while the galvanized layer of EG is more stable.It is thin and cannot form a zinc-iron alloy layer, so the anti-corrosion and anti-corrosion properties of GI are better than those of EG; The galvanizing amount of GI can reach more than 45 grams per square meter, while the galvanizing amount of EG is only about 20 grams. It will directly affect the radiation protection and oxidation resistance of the steel plate;Compared with EG, GI has stronger adsorption to electromagnetic waves, especially low-frequency electromagnetic waves, and this material also has better heat dissipation and conductivity, can effectively resist high-frequency electromagnetic waves. The electroplating is as bright as mercury, and the hot-dip is black. Zinc is easily soluble in acid and can also be dissolved in alkali, so it is called amphoteric metal. Almost no change occurs in dry air. In humid air, a dense basic zinc carbonate film will be formed on the zinc surface. In sulfur dioxide, hydrogen sulfide and marine atmospheres, zinc has poor corrosion resistance, especially in high humidity and high temperature atmospheres containing organic acids the galvanized layer is easily corroded. The standard electrode for zinc is -076V, and for steel, the new coating is a dry anodic coating. It is mainly used to prevent the corrosion of steel corrosion, the pros and cons of its protective performance have a great relationship with the coating. The zinc coating is passivated. After being dyed or coated with a light protectant, its protective and decorative properties can be significantly improved. The development of galvanizing process, the use of high-performance galvanized layer brightener, galvanizing has been developed from a purely protective purpose application. The most important one is electroplating, the cost of electrogalvanizing is high, the surface is good, and it is resistant to fingerprints. Products with higher fineness are generally electro-galvanized. The biggest difference between the two is that the formation principle of the zinc layer is different. Hot-dip galvanizing: zinc layer formation principle zinc-iron alloy layer, pure zinc layer, oxide layer. Electroplating: The principle of zinc layer formation: Zinc atoms are deposited, and the zinc layer is formed after reaching the atomic growth point. The difference between electro-galvanizing and hot-dip galvanizing: 1. The thickness is different, the electro-galvanized zinc layer is thinner, and the hot-dip galvanized zinc layer is thicker (a lot thicker); 2. The appearance is different, the appearance of electro-galvanizing is smooth and bright, and the appearance of hot-dip galvanizing is rough and glossy; 3. The application environment is different, electro-galvanizing is used for general occasions, hot-dip galvanizing is used for outdoor and other occasions; 4. The protection ability of anti-corrosion is different, electro-galvanizing is not as strong as hot-dip galvanizing. Application: Electrogalvanizing is used for general anti-corrosion occasions in various industries, and hot-dip galvanizing is used for outdoor occasions requiring strong corrosion resistance. Electrogalvanizing is by applying electricity to the plate and the workpiece, and galvanizing under the action of an electric field. Hot-dip galvanizing, also known as hot-dip galvanizing, is to melt zinc into zinc water, immerse the semi-plated workpiece in the zinc water, take it out, and the surface will be very sticky thick zinc, unpowered. The simplest, which can be distinguished from the two processes, electro-galvanizing is to reduce the zinc ions in the bath by applying an external electric field. The surface of the material to be plated forms a uniform and dense coating, so it has a beautiful appearance, and galvanizing is to melt the zinc into a liquid state, then directly immerse the plated material, and then take it out to dry, the process is simple, the coating is thick, and the anti-corrosion ability is good, but it is rough in appearance. In terms of application, electro-galvanizing is mostly used for small parts, requiring meticulous and precise electroplating, such as screws, automotive interior parts, etc. Hot-dip galvanizing is mostly large pieces, such as long iron pipes and so on.
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