Building products made of aluminum and aluminum alloy materials. It is usually processed into castings, forged products, foils, plates, strips, tubes, rods, profiles, etc., and then made by cold bending, sawing, drilling, assembly, coloring and other processes.
Performance Pure aluminum has low strength and its use is limited. However, adding a small amount of one or several alloying elements, such as magnesium, silicon, manganese, copper, zinc, iron, chromium, titanium, etc., can be added to obtain aluminum alloys with different properties. The aluminum alloy is further strengthened and hardened by cold working and heat treatment, and its tensile strength is greatly improved.
The standard potential of aluminum is -1.67 volts, the chemical properties are very active, easy to react with oxygen in the air to form a firm and dense oxide film, so in the ordinary atmosphere and clean water, aluminum has good corrosion resistance. However, galvanic corrosion occurs when in contact with steel or other metal materials, corrosion occurs when it comes into contact with alkaline materials such as concrete, cement mortar, lime and other alkaline materials in a humid environment, and corrosion occurs when it comes into contact with wood, soil, etc. Therefore, appropriate antiseptic treatment is required.
Production method Aluminum alloy is divided into two categories: cast aluminum alloy and deformed aluminum alloy according to its different production methods. Deformed aluminum alloys are generally used in construction to roll into plates, foils, strips, and extruded into rods, tubes or profiles of various complex shapes. According to its performance and use, deformed aluminum alloy is divided into anti-rust aluminum alloy, duralumin, super hard aluminum and special aluminum. Industrial pure aluminum (L1~L1), anti-rust aluminum alloy (LF2, LF21, etc.) and forged aluminum (LD2) are generally used in buildings.
The biggest feature of aluminum and aluminum alloy, first of all, is that its bulk density is about 1/3 of steel, and the specific strength (the ratio of strength limit to specific gravity) can reach or exceed structural steel. Secondly, aluminum and aluminum alloys are easy to process into various shapes and can adapt to various connection processes, thus providing favorable conditions for the most economical and reasonable cross-sectional form of building structures. Therefore, the use of aluminum alloy can not only greatly reduce the weight of the building, save materials, but also reduce the transportation and installation workload of components and accelerate the construction progress. The economic impact is even more significant for earthquake areas and inaccessible mountainous and remote areas. Aluminum and aluminum alloy have beautiful color, good corrosion resistance, high reflectivity to light and heat, good sound absorption performance, and a variety of different colors can be obtained by chemical and electrochemical methods. Therefore, aluminum is widely used in roofs, walls, doors and windows, skeletons, interior and exterior decorative panels, ceilings, suspended ceilings, railings, interior furniture, store containers and construction templates of industrial and civil buildings.
The construction industry is one of the three main markets of aluminum, about 20% of the world's total aluminum production is used in the construction industry, and the construction industry in some industrially developed countries, its aluminum consumption has accounted for more than 30% of its total output. In recent years, the products of architectural aluminum have been continuously updated, and the application of novel building products such as color aluminum plates, composite aluminum plates, composite door and window frames, and aluminum alloy formwork has also increased year by year. China has applied aluminum alloy in industrial and civil buildings to make roofs, walls, doors and windows, etc., and gradually expanded to interior and exterior decoration, construction formwork, etc., and has achieved good results.
