In life, we often encounter the use of aluminum pipes or aluminum alloy pipes, but people who don't know much about the metal industry are likely to confuse aluminum pipes and aluminum alloy pipes, thinking that they are the same thing. In fact, there is a difference between the two. Aluminum pipe is not the abbreviation of aluminum alloy pipe, so what is the difference between aluminum pipe and aluminum alloy pipe?

The aluminum pipe is made of pure aluminum or aluminum alloy, which is hollow along its longitudinal length. It can have one or more closed through holes with uniform wall thickness and cross section, and can be strengthened by heat treatment. It has moderate plasticity under the conditions of annealing, quenching and high temperature, and has good spot welding weldability. When gas welding and argon arc welding are used, aluminum pipes are easy to form intergranular crack. After quenching and cold working, aluminum pipes can be hardened, and the cutting performance is still good, but it is poor in the annealed state. According to their shapes, aluminum pipes are divided into square pipes, round pipes, patterned pipes, special-shaped pipes and so on.

Aluminum alloy pipe is widely used. Aluminum alloy pipe refers to the use of extruding and processing aluminum alloy into metal tubular material. The metal tubular material can have one or more closed through holes, uniform wall thickness and cross section, and low aluminum alloy density, but its strength is high, approaching or exceeding that of high-quality steel, and it has good plasticity. It can be processed into various configuration files. It has excellent electrical conductivity, thermal conductivity and corrosion resistance, and is widely used in industry. Its use is second only to steel, and it is often used in automobiles, ships, aerospace, aviation, electrical appliances, agriculture, electromechanical and household appliances.

The surface treatment of aluminum alloy pipes can be divided into pretreatment and post-treatment. Pretreatment is to remove the scale and oil stains on the surface, increase the adhesion after treatment and improve the appearance. The common surface pretreatment of aluminum alloy pipes is sandblasting, sandblasting and phosphating. Four types of post-treatment are usually used: spraying, oxidation, electroplating and electrophoresis. Due to cost reasons, other surface treatment methods are only used for products with special requirements. Before surface treatment of aluminum alloy pipes, different oxidation treatment processes should be selected according to your own requirements:

1. Anodizing produces a dense aluminum oxide film on the surface of aluminum alloy tube, which makes it react with air again, thus improving the protective performance of aluminum tube. At the same time, the oxide film isolates the internal free ions and makes it unable to conduct electricity.

2. Various colors will be formed on the colored oxide film after anodic oxidation to meet specific use requirements, such as black for optical instrument parts and golden for medals.

3. The chemical oxidation method is used for general protection, and the general processing technology is difficult and the production cost is low.

4. Apply an organic protective layer, which is usually used for oxidation, for external protection and decoration equipment.

Aluminum alloy pipe itself has good corrosion resistance, and it is more difficult to rust after anti-oxidation treatment, which is why aluminum alloy pipe is more durable than ordinary carbon steel pipe and galvanized pipe.

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