A construction product made of aluminum and aluminum alloy materials. It is usually processed into castings, forged products, foils, plates, belts, tubes, rods, profiles, etc., and then processed by cold bending, sawing, drilling, assembling, and coloring.
Performance Pure aluminum has low strength and its use is limited. However, by adding a small amount of one or several alloying elements such as magnesium, silicon, manganese, copper, zinc, iron, chromium, titanium, etc., aluminum alloys having different properties can be obtained. 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. It is very reactive and easily reacts with oxygen in the air to form a strong and dense oxide film. Therefore, aluminum has good corrosion resistance in ordinary atmosphere and clean water. However, when it comes into contact with steel or other metal materials, it will cause galvanic corrosion. When it is in contact with alkaline materials such as concrete, cement mortar and lime in a humid environment, it will cause corrosion, and it will also corrode when it comes into contact with wood and soil. Therefore, proper anti-corrosion treatment is required.
Production methods Aluminum alloys are divided into two major categories: cast aluminum alloy and deformed aluminum alloy according to their different production methods. The building is generally made of deformed aluminum alloy for rolling into sheets, foils, strips, extruded into rods, tubes or profiles of various complex shapes. Deformed aluminum alloys are classified into rust-proof aluminum alloy, hard aluminum, super-hard aluminum and special aluminum according to their performance and application. Industrial pure aluminum (L1 ~ L1), rust-proof aluminum alloy (LF2, LF21, etc.) and wrought aluminum (LD2) are generally used in the construction.
Features and Uses The biggest feature of aluminum and aluminum alloys is that the bulk density is about 1/3 of steel, and the specific strength (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 be adapted to various joining processes, thereby providing favorable conditions for the most economical and reasonable section form of the building structure. 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 work of the components and speed up the construction progress. This is more economical for earthquake zones and mountainous areas and remote areas with inconvenient traffic. Aluminum and aluminum alloys have beautiful color, good corrosion resistance, high reflectivity to light and heat, good sound absorption performance, and various 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, ceilings, railings, interior furniture, shop containers, and construction templates for industrial and civil buildings.
The construction industry is one of the three major markets for aluminum. About 20% of the world's total aluminum production is used in the construction industry. In some industrialized countries, the construction industry uses more than 30% of its total output. In recent years, the products of architectural aluminum products have been continuously updated, and the application of novel architectural products such as colored aluminum plates, composite aluminum plates, composite door and window frames, and aluminum alloy templates has also increased year by year. China has applied aluminum alloys to roofs, walls, doors and windows in industrial and civil buildings, and has gradually expanded its interior and exterior decoration and construction templates, and has achieved good results.
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