What is galvanized steel?
Galvanizing is an economical and effective anti-corrosion method often used.
Classification of galvanized steel
Hot-dip galvanized steel, electro-galvanized steel, single-sided or double-sided differential thickness galvanized steel, alloy composite galvanized steel, color galvanized steel, printing coated galvanized steel, polyvinyl chloride laminated galvanized steel, etc.
What is aluminum?
Aluminum is a kind of light metal, its chemical symbol is Al, and its atomic number is 13.
The main properties of aluminum
The density of aluminum is small, only 2.7 times that of water; the specific strength of aluminum (the ratio of strength to weight) is high, and the mechanical strength of some high-strength aluminum alloys exceeds that of structural steel; aluminum has no magnetism, and aluminum at low temperatures (-198 ℃) will not be brittle and still have good mechanical properties.
Aluminum can be rolled into thin plates and foils, drawn into filaments, and extruded into various complex shapes. Its ductility is very good; aluminum can quickly combine with oxygen in the air to form a dense and hard aluminum oxide film. With a thickness of 0.005 to 0.02 microns, it becomes a natural protective layer of aluminum and prevents aluminum from being oxidized. Therefore, it has good corrosion resistance. It can also be anodized or electroplated to produce bright colors on the surface of aluminum and aluminum products. Oxide film.
Aluminum has good electrical and thermal conductivity. The electrical conductivity is equivalent to 64.94% of the international standard annealed copper, which is about half of silver. For the same weight, the electrical conductivity of aluminum exceeds these two metals; the thermal conductivity of aluminum is almost better than The thermal conductivity of iron is three times greater; aluminum has strong reflective properties, reflecting ultraviolet rays stronger than silver, and aluminum does not produce sparks when hit.
Applications of aluminum
Because of its excellent physical properties, aluminum has been widely used in various sectors of the national economy and defense industry.
As a lightweight structural material, aluminum is light in weight and strong. Land, sea, and air vehicles, especially aircraft, missiles, rockets, satellites, etc., use a large amount of aluminum. A supersonic aircraft uses aluminum. 70% of its own weight, and the amount of aluminum used in missile accounts for more than 10% of its total weight.
Various vehicles made of aluminum and aluminum alloys can reduce energy consumption due to their lightweight. The energy saved far exceeds the energy consumed during aluminum smelting.
In the construction industry, aluminum alloy is used as the door, window, and structural material of the house, and the solar collector is made of aluminum, which can save energy.
In terms of power transmission, aluminum is the first to use, and 90% of high-voltage electrical wires are made of aluminum.
In the food industry, most of the storage tanks, cans, and beverage containers are made of aluminum.
In other aspects, aluminum powder is used as a reducing agent for refractory metals (such as molybdenum, etc.) and as a deoxidizer in the steelmaking process, as well as pots, basins, spoons, etc. in daily life.
Galvanized steel vs Aluminum
Aluminum is expensive, but it is favored for its light and strong characteristics, which can help reduce transportation costs. Although the corrosion resistance of aluminum is not as strong as that of galvanized steel, it is still a good choice compared with other materials.
Compared with aluminum, galvanized steel has the advantages of low processing cost, durability, and high corrosion resistance. Each of the materials has its own advantages.