Comparison between aluminum-coated steel coil and galvanized steel coil

Alu-zinc steel coil is a common metal material widely used in construction, home appliances, automobile manufacturing and other fields. It combines the strength of steel with the corrosion resistance of aluminum and zinc by coating an aluminum-zinc alloy layer on the surface of a steel substrate.

1. Basic composition of aluminum-zinc steel coil

The substrate of aluminum-zinc steel coil is a cold-rolled steel sheet, and a layer of aluminum-zinc alloy is coated on the surface through a hot-dip coating process. The typical coating composition is 55% aluminum, 43.4% zinc and 1.6% silicon. The addition of silicon helps to improve the bonding strength between the coating and the steel substrate and prevent the coating from peeling off. The coating thickness of aluminum-zinc steel coil is usually between 10 and 30 microns, depending on the application requirements.

2. Comparison between aluminum-zinc steel coil and other coated steel coils

(1) Comparison with galvanized steel coil

The coating composition of galvanized steel coil is pure zinc. Although it has good corrosion resistance, it corrodes faster in certain environments (such as high humidity and high salt environments). In contrast, the aluminum-zinc alloy layer of galvanized steel coils can form a denser oxide film, with stronger corrosion resistance and longer service life. The addition of aluminum makes galvanized steel coils more stable in high temperature environments, while pure zinc is easily oxidized and ineffective at high temperatures.

(2) Comparison with aluminum-coated steel coils

The coating of aluminum-coated steel coils is pure aluminum, and its high temperature resistance is worse than that of galvanized steel coils, but its corrosion resistance in normal atmospheric environments is not as good as that of galvanized steel coils. The zinc in the aluminum-zinc alloy can provide cathodic protection. Even if the coating is partially damaged, the zinc will corrode first and protect the steel base from rust. The pure aluminum coating does not have this property. Once damaged, the steel base is prone to rust.

3. Application areas of galvanized steel coils

(1) Construction industry

Aluminum-zinc steel coils are often used in building roofs, walls, awnings, etc. Its corrosion resistance and aesthetics make it one of the preferred modern building materials.

(2) Home appliance manufacturing

Some home appliance housings, such as refrigerators, washing machines, and air conditioner outdoor units, are made of galvanized steel coils to improve product durability.

(3) Automobile industry

Some automobile parts, such as exhaust pipe guards and fuel tank housings, use galvanized steel coils to improve corrosion resistance.

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