Gray Anodized Aluminum Stereo Device Panel For Amplifier

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Aluminum is a light metal among non-ferrous metals. It is light in texture and has a density of about 1 / 3 of that of steel. It is one of the basic materials of various light structures. Aluminum is silvery white and has a strong reflection ability, so it is often used to manufacture mirrors, reflective and heat-insulating roofs, etc.

To improve the strength and hardness of pure aluminum and maintain the original excellent characteristics of pure aluminum, the aluminum base alloy was obtained by adding an appropriate amount of copper, magnesium, manganese, silicon, zinc, and other elements to pure aluminum are called an aluminum alloy.

Aluminum alloy makes up for the shortcomings of pure aluminum and adds many excellent properties. It is a typical lightweight high-strength material with lightweight, low density, and high strength. The corrosion resistance of aluminum alloy has been greatly improved, the low-temperature performance is good, and the low-temperature brittleness is not shown. It is easy to color and has a good decoration. However, aluminum alloy still has some disadvantages, mainly the small elastic modulus. Although it can reduce temperature stress, it is used as a structural stress-bearing member with small sensitivity and large deformation. Secondly, aluminum alloy has poor heat resistance, a large thermal expansion coefficient, and poor weldability.

Aluminum profile processing

Building aluminum profiles mainly refer to aluminum alloy profiles, and their processing methods can be divided into extrusion method and rolling method. Most of them adopt the extrusion method, and the rolling method is only used when the batch is large, the size and surface requirements are low for medium and small-sized bars and profiles with simple section shapes.

Extrusion is a method of metal pressure machining. There is forward extrusion, reverse extrusion and forward and reverse combined extrusion. Aluminum alloy profiles mainly adopt the forward extrusion method. It is to put the aluminum alloy ingot into the extrusion cylinder and force the metal to flow out through the die hole at the end of the extrusion cylinder under the action of the extrusion shaft to obtain an extruded product with the same size and shape as the die hole. Aluminum extruded materials include pipes, bars, and profiles, of which profiles are the most. The production process of extruded profiles is often different due to the variety, specification, supply, quality requirements, process methods, equipment conditions, and other factors, and is often comprehensively selected and formulated according to specific conditions.

Aluminum profiles also need to be surface treated by neutralizing water washing or anodizing. The treatment method of anodic oxidation treatment is to take the aluminum profile as the anode, release hydrogen on the cathode during water electrolysis in acid solution, and generate oxygen on the anode. The primary oxygen and the trivalent aluminum ions formed on the aluminum anode combine to form an aluminum oxide film. The purpose is to form an artificial oxide film layer thicker than the natural oxide film on the surface of the aluminum profile, conduct a "sealing" treatment, so that the surface of the treated profile is silvery white, and improve the surface hardness, wear resistance and corrosion resistance. At the same time, the smooth and dense film layer also creates conditions for further coloring.

The aluminum profiles after neutralization water washing or anodizing shall be subject to surface coloring treatment. The coloring methods include natural coloring, electrolytic coloring, and painting. Natural coloring and electrolytic coloring are commonly used. The former produces coloring at the same time as anodizing, while the metal ions in the electrolyte containing metal are electrodeposited to the bottom of the pinhole of the aluminum anodized film through electrolysis, and the light diffuses on the metal ions to make the oxide film appear color.