Aluminum alloy has the characteristics of low density, good mechanical properties, good processing properties, non-toxic, easy to recycle, electrical conductivity, heat transfer and corrosion resistance, etc., used in the marine industry, chemical industry, aerospace, metal packaging, transportation, etc. Widely used in the field.　　1. Aerospace 　　Aluminum alloy is the main material used in the manufacture of aircraft. Compared with the mild steel used in automobile manufacturing, aluminum alloy is expensive and has a low density. The relative density is 2.8. Compared with the relative density of mild steel of 7.8, it is about one-third lighter. Although the strength is similar, it is the material for airplanes. Lightness is the most important thing, and it has strong corrosion resistance and convenient processing. Therefore, aluminum alloy is the most ideal material for making airplanes. Duralumin can be used to manufacture rivets, aircraft propellers and high-strength parts on aircrafts according to the content of its alloying elements; super-duralumin is duralumin containing zinc, its hardness and strength are higher than duralumin, and different varieties of super-duralumin It is used to manufacture various structural parts and high-load parts. It is one of the important materials in the aviation industry. 2. Marine industry aluminum and aluminum alloys are used more and more widely in the shipbuilding industry, from small motorboats to 10,000-ton oil tankers, from offshore hovercraft to submarine submarines, from civilian to military, from fishing vessels to marine mining vessels, etc. Use aluminum alloy with excellent comprehensive performance to produce ship shells, support structures, supporting facilities, pipelines, etc.　　Aluminum alloy used in the marine industry can reduce the overall weight of the ship, increase the speed of the ship, and resist the corrosion of the ship by seawater.　　The aluminum alloys used in the marine industry are mainly aluminum-copper alloys, aluminum-magnesium alloys and aluminum-silicon alloys. Aluminum-copper alloy is widely used in ships in China and Russia, but its poor seawater corrosion resistance hinders its development in the shipbuilding industry. Aluminum-magnesium alloys are mainly used for hull shells, water pump pipes, pump shells and frame supports, etc., and the brands are 5083, 5086, 5456, 5466, etc. The aluminum-silicon alloy has moderate structural strength, good fluidity, and strong filling ability. It is easy to produce components with high density and complex structure, such as high-pressure valves, cylinder blocks, pumps, gearbox casings, turbine blades, etc. 3. Application in the chemical industry. Aluminum has good thermal conductivity. Aluminum and aluminum alloy are widely used in the production of heat exchange equipment in chemical equipment, storage tanks resistant to concentrated nitric acid corrosion, adsorption filters, fractionating towers, pipelines and many linings Wait. Cast aluminum alloy has good fluidity, strong mold filling ability, small shrinkage rate, not easy to form cracks, good corrosion resistance (a protective film of aluminum oxide and silicon dioxide can be formed on the surface), light weight, good mechanical properties, It is widely used in the manufacture of corrosion-resistant parts with complex structures, such as cylinders, pipe fittings, valves, pumps, pistons, etc. Aluminum has many special uses in chemical production. Aluminum does not produce sparks, aluminum alloy can produce containers that contain easily volatile substances; aluminum is non-toxic, will not cause food deterioration, does not affect the appearance of goods, and does not corrode goods. Therefore, aluminum alloys are widely used in the production of food and chemical industries. equipment. 4. Application in the metal packaging industry Aluminum alloy can be used for metal packaging. It has the following excellent characteristics: good mechanical properties, light weight, high compressive strength, durable, easy to store and transport goods; good barrier properties, can block sunlight, Oxygen and humid environment can damage items and extend the shelf life of items; good texture and beauty, aluminum alloy used for packaging has a unique metallic luster, good touch, beautiful, and improved product quality; non-toxic, easy to recycle, and recyclable Utilize, save resources and reduce environmental pollution. Aluminum alloy is widely used in beer, beverage and other food cans, mostly in stamping and drawing forming structures. Aluminum foil utensils are beautiful, light in weight, and good in heat transfer. They are used for fast food packaging. They have the functions of preservation, taste preservation and non-toxicity, and are used by more and more food industries. The aluminum alloy metal hose can be squeezed and deformed, and the contents can be used after squeezing. It is simple and convenient. It is often used for cream cosmetic packaging. 5. Application in other industries. Aluminum alloy has high specific strength, light weight, good fluidity, strong filling ability, good corrosion resistance, and low melting point. It is widely used in tractors, locomotive parts, electronic products, medical equipment, and construction. Decoration and other industries. Aluminum alloy has excellent ductility and is widely used in the daily necessities industry and the food industry. In the field of power transmission, wires made of aluminum alloy have low cost, light weight, good corrosion resistance, heat transfer, easy conduction, and wear resistance, so people are paying more and more attention. In the field of power transmission, aluminum alloy is used the most, and up to 90% of high-voltage wire materials are aluminum products. Aluminum-silicon alloy can be used as a good deoxidizer to reduce the sensitivity of steel to produce subcutaneous bubbles, steel-making deoxidation improves the quality of steel, the market for aluminum-silicon alloy is large, and the national annual demand reaches one million tons.