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Electro galvanized steel combines corrosion resistance and uniform surface. It is a kind of galvanized steel applying a uniform and dense zinc coating layer to steel through electrolysis. The zinc coating is able to protect the steel surface from oxidation and also provides a better visual appearance. At Wanzhi Steel, we have both electro galvanized (EG) sheets and coils for sale, with a thickness from 0.3mm to 2mm and width from 600 to 1,500 mm. Welcome to contact us for more details!
|Item||Electro Galvanized Steel|
|Base Metal||Cold rolled steel|
|Zinc Layer||10-30 g/m2|
|Surface Treatment||oiled, chromated, phosphatized, fingerprint resisting, painted, etc.|
|Package||Export standard packaging|
|Usage||Electronic parts, furniture, automobile panels, internal parts, door frames, etc.|
Electro galvanized steel is a type of steel that is coated with zinc for protection through the electroplating process. The zinc coating is applied to the cold-rolled steel at a low temperature. So EG steel is also known as cold galvanized steel. Through electrolytic galvanizing, it finally forms a uniform and dense zinc layer on the steel surface but still keeps the mechanical properties of the material. Electro-galvanized steel is often sold in coil or sheet form. EG coil is a kind of material, which can be sheared, slit, and profiled for other uses. The coil weight usually ranges from 3 to 5 tons. While EG sheet is a kind of finished or semi-finished product. You can use it directly or further process it for other uses. Below are the packaging details.
Electro galvanizing process is applying a layer of zinc to the steel surface through electroplating. That is, running a current of electricity through a saline/zinc solution with a zinc anode and steel conductor. The purpose of electro-galvanizing is to protect against corrosion and prolong the service life of steel, and also increase its decorative appearance. Zinc is not easy to change in the dry air and it can form a kind of alkaline zinc carbonate film in a humid environment, which can protect the steel not being corroded. Even if the protective layer is broken, a micro battery formed between zinc and steel will make the steel substrate metal under protection. The full cold galvanizing process is:
Chemical degreasing→hot water washing→water washing→electrolytic degreasing→water washing→ acid pickling → rust cleaning →water washing→electro-galvanizing process→water washing→ passivation→hot water washing→drying→quality inspection→packaging for sale
After cold galvanizing, the mechanical property of steel will not change. While with the protection of the zinc layer, it has some great features:
1. Good processability, paintability, and ductility
2. Good abrasion resistance
3. Uniform and even protective coating
4. Bright and aesthetic appealing
5. Great corrosion resistance
Nowadays, electro galvanised steel is used in many different fields due to its unique properties and pretty appearance. It can be applied in the automotive industry, aerospace, home/electrical appliances, residence, commerce, energy, transportation, and manufacturing industries. Some approved examples include:
1. Fabricating wire meshes, like galvanized chain link fencing;
2. Making precise instruments, computer case shells, vehicle frames, and so on;
3. Manufacturing door frames, ceilings, wall panels, roofing sheets, etc.
4. Further processing like forming, drawing, stretching, and bending;
5. Automobile internal panels, gas tanks, door panels, etc.
However, you should remember that electro-galvanized products are not intended to withstand outdoor exposure without chemical treatment or painting.
When it comes to electro galvanizing steel, many people will think of the hot dipped galvanized steel. Both galvanization methods, what are the differences between them? Let’s see below.
Hot-dip galvanizing is a method of metal corrosion protection. After pretreatment, the steel will be immersed in the hot liquid zinc to make the steel surface adhere to the zinc. This can improve the corrosion resistance and performance of the steel material. The production process of hot-dip galvanizing is as follows:
Raw steel → degreasing → water washing → pickling → water washing → rinsing → flux solution → drying → hot-dip galvanizing → cooling → inspection → packaging
On the contrary, cold galvanizing is to form a smooth and dense metal coating through electrolysis on the steel surface. the zinc ions in the electroplating solution are sent to the steel plate through an electric current. The thicker the coating, the more electric energy is consumed. The basic process of electro galvanizing is as follows:
Raw steel → degreasing → erosion → polishing → galvanizing → hydrogen removal → passivation/dyeing
Due to the hot processing, the HDG steel is easy to produce thick zinc coating, which can reach 275 g/m2. While the EG steel is much thinner, ranging between 10-30 g/m2.
The zinc layer of hot-dip galvanizing steel is thicker than that of electro-galvanizing steel. Therefore, HDG steel has better corrosion resistance than EG steel.
The surface of hot-dip galvanized steel is darker, uneven, and slightly rough, and will produce spangles, water lines, dripping tumors, etc. It is silvery-grey in color. However, electro-galvanized steel has a uniform and dense zinc layer, with a smooth and bright surface. It is silvery-white and free of zinc flowers. But over time, the zinc layer is easy to fall off.
Hot-dip galvanized steel products have the characteristics of excellent corrosion resistance, low production cost, and environmental protection. Therefore, it is more suitable for large parts and widely used in many industries like construction, agriculture, energy, oil & gas, transportation, etc.
Electro-galvanized steel products have good processability, weldability, and paintability, more suitable for making small parts. So they are mostly used for automotive exterior panels, high-end home appliances, office supplies, kitchenware, and so on.
Due to its complicated production procedures and high fabricating cost, the price of electro GI steel is much costlier than that of hot-dipped GI steel.
Q: Will Electro Zinc Coated Steel Rust?
A: Yes, it will rust over time. As we know, the corrosion resistance of galvanized steel sheets largely depends on the thickness of the protective zinc coating. Electro-galvanized steel usually has a thin zinc layer. Therefore, it does not live as long as hot dipped galvanized steel. Under normal conditions, it only has a few years of life.
Q: Is Electro Galvanized Steel Magnetic?
A: EG steel is magnetic because the base steel metal is magnetic. Though cold galvanized steel is covered with a layer of zinc, it does not interfere with the magnetic feature of the steel.
Wanzhi Steel is a leading galvanized steel manufacturer and supplier in China. At our factory, we have both hot-dipped galvanizing lines and electro-galvanizing lines. Also, we have full sets of equipment to provide galvanized coils and sheets, GI strips, corrugated GI sheets, etc. to meet your different requirements. Moreover, we also have color coating lines to offer you PPGI steel coils in different colors and patterns. As a wholesale supplier in China, we will provide our clients with the best price and quality. All our products are subject to third-party quality testing. If you are looking for galvanized steel products, please contact us for an online or on-site factory tour now!