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Industrial pure aluminum is generally determined to have a purity of 99.0% to 99.9% aluminum, and China has a purity of 98.8% to 99.7% aluminum. There are many pure aluminum grades in China's plastic deformation processing industry. Among the main impurities in pure aluminum, including iron and silicon. There are two types of pure aluminum smelting products and pressure processed products. The former is represented by chemical composition Al, and the latter is represented by Chinese Pinyin LV (aluminum, industrial).
Aluminum alloy is one of the most widely used non-ferrous metal structural materials in the industry and has been widely used in aviation, aerospace, automotive, machinery manufacturing, marine and chemical industries. With the rapid development of the industrial economy, the demand for aluminum alloy welded structural parts is increasing, and the research on the weldability of aluminum alloys is also deepened. Aluminum alloys are currently the most widely used alloys.
First, the deformed aluminum alloy can withstand pressure processing. It can be processed into aluminum alloy materials of various shapes and specifications. Mainly used in the manufacture of aviation equipment, building doors and windows.
Second, the cast aluminum alloy can be divided into aluminum-silicon alloy, aluminum-copper alloy, aluminum-magnesium alloy, aluminum-zinc alloy and aluminum rare-earth alloy according to chemical composition, among which aluminum-silicon alloy has hypereutectic silicon aluminum alloy and eutectic silicon aluminum alloy. , single eutectic silicon aluminum alloy, cast aluminum alloy used in the as-cast state.
First, they are about the same density. They are all so-called lightweight materials.
Secondly, aluminum alloys usually use alloying elements such as copper, zinc, manganese, silicon and magnesium. They were invented by the German Alfred Wilm in the early 20th century and helped the development of the aircraft. After the first war, the German aluminum alloy was listed as a state secret. It is lighter and more resistant to corrosion than ordinary carbon steel, but it is less corrosion resistant than pure aluminum. The surface of the aluminum alloy forms a protective oxide layer in a clean, dry environment.
Third, silver-white light metal. It is malleable. The product is often formed into a rod shape, a sheet shape, a foil shape, a powder shape, a ribbon shape, and a filament shape. An oxide film that prevents corrosion of metals can be formed in humid air. Aluminum powder and aluminum foil are heated in the air to burn violently and give off a dazzling white flame. Soluble in dilute sulfuric acid, nitric acid, hydrochloric acid, sodium hydroxide and potassium hydroxide solution, difficult to dissolve in water. The relative density is 2.70. The temperature of 660 ° C. The boiling point is 2327 ° C. The content of aluminum in the earth's crust is second only to oxygen and silicon, ranking third, and is the most abundant metal element in the earth's crust. The development of three important industries of aviation, construction and automobile requires that the material properties have the unique properties of aluminum and its alloys, which is greatly beneficial to the production and application of this new metal aluminum. The application is extremely extensive.
Fourth, but aluminum, its toughness is relatively poor, soft and easy to deform. The aluminum alloy, although similar in density, is tough, not easily deformed, and can be used as a flying material.