Aluminum and aluminum alloy pipes can be hot extruded, cold extruded, cold rolled, cold drawn (including coil drawing), cold bending,

Welding (cold forming + high-frequency welding), spinning, continuous extrusion and other methods of production. At present, there are more than thousands of aluminum alloy pipe varieties.

According to the wall thickness of the pipe can be divided into thin wall pipe and thick wall pipe. The thick wall pipe is mainly produced by hot extrusion method, and the wall thickness is generally 5 ~ 35 mm, and the maximum wall thickness produced by the large extrusion machine can reach more than 65 mm. Thin wall tube can be made by hot extrusion, cold extrusion, cold rolling, cold drawing and other cold deformation methods, the wall thickness is generally 0.5 ~ 5 mm, with the continuous improvement of the cold rolling machine, the emergence of spinning and welding tube method, the minimum wall thickness of aluminum alloy can be as small as 0.1mm.

According to the specifications, it can be divided into large diameter thick wall pipe, large diameter thin wall pipe and small diameter thin wall pipe. According to the section shape, it can be divided into circular tubes, oval tubes, drop tubes, oblate tubes, square tubes, rectangular tubes, hexagonal tubes, octagonal tubes, pentagonal tubes, trapezoidal tubes, ribbed tubes and other special-shaped tubes (FIG. 3-2-4). The change of section along the length direction can be divided into constant section pipe and variable section pipe.

According to the production method, it can be divided into hot extrusion pipe, cold extrusion pipe, Confum extrusion pipe, hot rolled pipe, cold rolled pipe, spinning pipe, cold bending pipe, welded pipe, spiral pipe, coil stretching pipe, bimetal pipe, adhesive nozzle, etc.

According to the use can be divided into military and civilian pipe, shell pipe, container pipe, drilling pipe, casing, waveguide, heating pipe, condensation tube, evaporator tube, nozzle tube, agricultural irrigation pipe, flagpole, electric pole, pantograph rod and other structural parts of the pipe and decorative pipe, daily necessities and other pipes.

Brief analysis of chemical conversion treatment of aluminium and aluminium alloys

The chemical conversion of aluminum and aluminum alloys is formed by the direct reaction of the aluminum surface with the chemical oxidant in the solution, and this process does not need to be applied voltage, also known as chemical oxidation treatment. Chemical conversion can be divided into two categories according to its solution properties: alkaline and acidic, and according to its film properties, there are oxide film, phosphate film, chromate film and chromate phosphate film. The obtained films are collectively referred to as chemical conversion films.

The chemical conversion film has a wide range of uses. In addition to the general protective effect, the conversion film obtained by some process formulas also has a decorative effect (the appearance needs to be coated with gloss paint), and some can improve the bonding strength with the coating; Some can still maintain the original conductive properties after chemical conversion treatment, so the film is also called conductive conversion film.

The chemical conversion process is simple to operate, the required equipment is simple, the production efficiency is high, the production cost is low, the conversion film obtained has a wide range of applications, and it is a coating variety with broad prospects and popularization value.

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