Galvanized Sheet and Coils

Galvanized sheet and coil is a carbon steel sheet coated with zinc on both sides. It is also known as galvanized iron or GI. Hot dipped galvanized sheet & coil is made of carbon steel coated in zinc utilizing the hot-dip process. The end result of this process is a layer of zinc on each side of the steel sheet or coil that is tightly adhered to the steel through the formation of an iron-zinc alloy bonding layer. Electrolytic galvanizing is an electro-chemical process in which a layer of zinc is applied in a bath of acid or alkali electrolytes. The main idea of this technology is to use oxidizing and reducing reactions, during which electrons move through the electron transport chain.

Galvanized sheet and coil while zinc ions in the electrolyte flow from anode to cathode. This type of coating is usually used for thin-gauge material; the coating thickness is normally 5-12 μm and it accurately follows the shape of the product. The absence of intermediate brittle layers makes electrolytic zinc coating more plastic compared with coating applied via hot-dip galvanizing. Major application areas for such products include automotive, transport and machine building, among others.

Low initial cost compared to most treated steels. In addition, galvanized steel is immediately ready to use when delivered. It does not require additional preparation of the surface, inspections, painting/coatings, etc. sparing companies more costs on their end.

Longer life. With galvanization, a piece of industrial steel is expected to last more than 50 years in average environments, and can last over 20 years with severe water exposure. There is no maintenance required. The increased durability of the steel's finished product also increases the product's reliability.

The sacrificial anode ensures that any damaged steel is protected by the surrounding zinc coating. It doesn't matter if the steel section is completely exposed; the zinc will still corrode first. The coating will corrode preferentially to the steel, creating a sacrificial protection to the areas that are damaged.

Rust resistance from the zinc coating. The iron elements in steel are incredibly prone to rusting, but the addition of zinc acts as a protective buffer between the steel and any moisture or oxygen. Galvanized steel is very protective, including sharp corners and recesses that couldn't be protected with other coatings, making it resistant to damage.

Advantages vs. Other Materials

Construction: Roofing, wall panels, structural frames.

Automotive: Body panels, chassis parts (EG/GA preferred).

Appliances: Washing machines, refrigerators, HVAC ducts.

Agriculture: Grain silos, fencing, animal cages.

Electrical: Cable trays, switch boxes.

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