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Electro Galvanized Steel

Electro galvanized steel is a type of steel that is coated with a layer of zinc through electrolysis. The zinc coating provides excellent corrosion resistance and a uniform surface, making it a popular choice in various applications. At Wanzhi Steel, we offer both electro galvanized (EG) sheets and coils in various sizes, ranging from 0.3 mm to 2 mm in thickness and 600 mm to 1,500 mm in width. Welcome to contact us for more information!

Electro Galvanised Steel Coils

Cold Galvanised Steel Coils

Electro Galvanised Sheets

Electro Galvanised Sheets

Electro Galvanized Steel Specifications

Item Electro Galvanized Steel
Base Metal Cold rolled steel
Thicknesses 0.3mm-2mm
Width 600mm-1,500mm
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.

What Is Electro-galvanized Steel?

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 8 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.

Package of Steel Coil

Package of Steel Coil

EG Sheets Packaging

EG Sheets Packaging

Electro-galvanized Steel Code

The steel code of the electro-galvanized steel is composed of the grade of the base metal, electro-galvanizing (E), and the zinc coating type and weight. The electro-galvanized products with substrates of SPCC, SPCD, SPCE, SPCF, and SPCG  are named SECC, SECD, SECE, SECF, and SECG respectively.

What Is Electroplating Galvanizing Process?

Electro galvanizing is a process that involves electroplating a layer of zinc onto the surface of steel. This is done by passing an electric current through a solution of zinc and saline, with a zinc anode and a steel conductor. Electro galvanizing aims to protect steel from corrosion, prolong its service life, and enhance its decorative appearance. Zinc has a high resistance to oxidation in dry air and in a humid environment, which provides protection against corrosion. When the protective layer is damaged, a micro battery is formed between the zinc and steel, which ensures that the steel substrate remains protected. 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

Electro Galvanized Steel Properties

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 surface
5. Great corrosion resistance

Production of Electro Galvanised Coil

Production of Electro Galvanised Coil

Electro Galvanised Steel Coil

Cold Galvanized Coil

Electro Galvanized Steel Usage

Electro galvanised steel’s unique properties and attractive appearance make it a popular choice in many fields, including household appliances, steel furniture, office equipment, automobiles, and building materials.
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.

Steel Door Frame

Steel Door Frame

Ceiling Rail

Ceiling Rail

Electro Galvanized vs Hot Dipped Galvanized Steel

Electro galvanized and hot-dipped galvanized steel are two popular methods of coating steel to prevent rust and corrosion. What are the differences between them? Please keep reading for more details.

1. Different Production Methods

Hot-dip galvanizing is a process of metal corrosion protection that involves immersing the steel in a hot liquid zinc bath after pretreatment. The steel surface adheres to the zinc, improving the corrosion resistance and performance of the steel material. The production process of hot-dip galvanizing is as follows:
Base metal → degreasing → water washing → pickling → water washing → rinsing → flux solution → drying → hot-dip galvanizing → cooling → inspection → packaging

On the other hand, electro galvanizing involves forming a smooth and dense metal coating through electrolysis on the steel surface. 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 includes several steps:
Base metal → degreasing → etching → polishing → galvanizing → hydrogen removal → passivation/dyeing

Hot-dip Galvanizing Process

Hot-dip Galvanizing Process

2. Zinc Coating Thicknesses

Hot-dip galvanized steel typically has a thicker coating than electro galvanized steel. The zinc coating thickness of HDG steel can reach 275 g/m2. While the EG steel is much thinner, ranging between 10-30 g/m2.

3. Corrosion Resistance

While both hot dip and cold galvanized steel provide some degree of corrosion resistance. But hot-dipped galvanized steel is generally more effective in preventing corrosion in harsh environments. This is because the thicker zinc coating provides a greater barrier against the corrosive elements.

4. Appearance Difference

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 Coil

Hot-dip Galvanized Steel Coil

Electro Galvanised Steel Coil

EGI Coil

5. Application Range Difference

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 it finds common usage in automotive exterior panels, high-end home appliances, office supplies, kitchenware, and other applications.

6. Cost Difference

Due to its complicated production procedures and high fabricating cost, the price of electro galvanized steel is much costlier than that of hot-dipped GI steel.

FAQ About EG 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: Yes, EG steel is magnetic. EG steel is a ferrous metal, which contains iron. Iron and steel are both magnetic materials, which means that electro galvanized steel will also be magnetic. The electroplating process applying the zinc coating to the steel does not affect the magnetic properties of the underlying steel.

Q:  Can you paint electro galvanized steel?

A: Yes. EGI steel and HDG steel can be painted. But it requires proper preparation and uses suitable paints properly.

To ensure good adhesion of the paint to the electro galvanized surface, it is important to first clean the surface by removing any oils, greases, or other contaminants.

Q: Is EGI steel the same as aluminum?

A: No, electro galvanized steel and aluminum are not the same. Electro galvanizing is a process of coating a metal, typically steel, with a thin layer of zinc using an electroplating process. This process helps protect the underlying metal from corrosion and rust. Aluminum is a chemical element and a metal. They are fundamentally different materials with distinct properties and applications.

GI Coils to Azerbaijan

GI Coils to Azerbaijan

Packaging of GI Coil to Lithuania

Packaging of GI Coil to Lithuania

Cooperate With Reliable Electro Galvanized Steel Suppliers

Wanzhi Steel is a reputable and leading manufacturer and supplier of galvanized steel in China. Our factory has both hot-dipped galvanizing and electro-galvanizing lines, as well as slitting lines, profiling equipment, etc. So we are able to provide a wide range of galvanized coils and sheets, strips, corrugated galvanized sheets, and more to meet your specific needs. As a wholesale supplier, we strive to offer our clients the best quality products at competitive prices. If you have an interest in our products, please contact us for an online or on-site factory tour today!

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