Why should the aluminum tube be oxidized

Aluminum tube oxidation refers to a material protection technology, also known as surface anodic oxidation, which is to form an oxide film on the surface of aluminum tubes through the external anode current in the electrolyte. 

After anodizing, the corrosion resistance, hardness, wear resistance, insulation and heat resistance of aluminum tube materials or products are greatly improved.

The most anodized metal material is aluminum.

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What is the difference between aluminum alloy pipe and aluminum pipe?

Aluminum pipe and aluminum alloy pipe are still common metal pipe fittings in daily life. People may know what their use attributes are when they are separated, but the concept may be vague when they are put together. In fact, not only individuals can’t distinguish them, but most of them can’t be distinguished when they are put together. Today, Xinlianchang aluminum small series will help you distinguish the difference between the two.

Aluminum pipe is a kind of high-strength hard aluminum, which can be strengthened by heat treatment. It has medium plasticity in annealing, rigid quenching and thermal state, and good spot welding. When gas welding and argon arc welding are used, aluminum pipe tends to form intergranular cracks; The machinability of aluminum pipe after quenching and cold work hardening is good, but it is poor in annealing state. The corrosion resistance is not high. Anodizing and painting methods or aluminum coating on the surface are often used to improve the corrosion resistance.

The density of aluminum alloy pipe is low, but the strength is relatively high. It is close to or higher than high-quality steel. It has good plasticity and can be processed into various profiles. It has excellent conductivity, thermal conductivity and corrosion resistance. It is widely used in industry, and the usage is only second to that of steel. Aluminum alloy pipe can use heat storage to obtain good mechanical properties, physical properties and corrosion resistance.

The anodization of aluminum tubes is generally carried out in an acidic electrolyte with aluminum as the anode. During electrolysis, oxyanions react with aluminum to form an oxide film. 

At the beginning of film formation, the film is not fine enough. Although there is a certain resistance, the negative oxygen ions in the electrolyte can still reach the aluminum surface and continue to form an oxide film.

As the film thickness increases, the resistance increases and the electrolysis current decreases. At this time, the outer oxide film in contact with the electrolyte is chemically dissolved. 

When the oxide formation rate and the chemical dissolution rate on the aluminum surface are gradually balanced, the oxide film can reach the maximum thickness under the electrolytic parameters.

The outer layer of the anodized aluminum film is porous and easily absorbs dyes and colored substances, so it can be dyed to improve its decorative properties. 

After hot water, high temperature steam or nickel salt sealing treatment, the corrosion resistance and wear resistance of the oxide film can be further improved. 

In the industry, except aluminum, magnesium alloy, copper and copper alloy, zinc and zinc alloy, steel, cadmium, tantalum, zirconium and other metals for surface anodic oxidation treatment.

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