The aluminum tube oxidation treatment technology refers to a material protection technology for forming an oxide film on the surface of an aluminum tube in an electrolyte solution by external application of an anode current, which is also called surface anodization. After the surface of the aluminum tube or product is anodized, its corrosion resistance, hardness, wear resistance, insulation and heat resistance are greatly improved. The metal material that performs the most anodizing treatment is aluminum.
The anodization of the aluminum tube is generally carried out in an acidic electrolyte with aluminum as the anode. During the electrolysis process, the anion of oxygen reacts with aluminum to produce an oxide film. The film is not sufficiently fine at the initial formation, and although there is a certain resistance, the negative oxygen ions in the electrolyte can still reach the aluminum surface to continue to form an oxide film. As the film thickness increases, the electric resistance also becomes large, so that the electrolysis current becomes small. At this time, the outer oxide film in contact with the electrolytic solution is chemically dissolved. When the rate at which the surface of the aluminum forms oxide is gradually balanced with the rate of chemical dissolution, the oxide film can reach the maximum thickness under this electrolysis parameter. The anodized film of aluminum is porous in the outer layer, and it is easy to adsorb dyes and colored substances, so that it can be dyed and improved in decorativeness. After the oxide film is further sealed by hot water, high-temperature steam or nickel salt, the corrosion resistance and wear resistance can be further improved.
In addition to aluminum, industrially surface anodized metals include magnesium alloys, copper and copper alloys, zinc and zinc alloys, steel, cadmium, niobium, zirconium, and the like.