Anodic oxidation was used in the production of aluminium profiles in the 1950s. It is the earliest and most widely used surface treatment method for building aluminium profiles. The outstanding feature of anodized profiles is the strong appearance of metal. The so-called anodic oxidation of aluminium materials is an electrolytic oxidation process, in which the surface of aluminium and aluminium alloys is usually transformed into an oxide film, which has protective, decorative and some other functional properties. The anodic oxide film of aluminium is formed in the process of anodic oxidation, which has protective, decorative and other practical properties.

Using metal or alloy parts as anode, electrolysis is used to form oxide film on the surface. Metal oxide films change the surface state and properties, such as surface coloring, improving corrosion resistance, enhancing wear resistance and hardness, and protecting metal surface. The hardness and wear resistance of anodized aluminium or its alloys are improved, reaching 250-500 kg/m2, with good heat resistance, melting point of hard anodic oxide film reaching 2320K, excellent insulation, breakdown voltage reaching 2000V, which enhances the corrosion resistance and does not corrode for thousands of hours in_=0.03NaCl salt spray. . There are a large number of micro-holes in the oxide film, which can absorb various lubricants. It is suitable for making engine cylinders or other wear-resistant parts. The film micro-holes have strong adsorption ability and can be colored into various beautiful colors.

What is the difference between anodization and conductive oxidation? Let's take a look.

1) Anodic oxidation is carried out under the condition of high voltage electricity, which is an electrochemical reaction process; while conductive oxidation (also called chemical oxidation) does not need electricity, it only needs to be immersed in the liquid medicine. It is a purified chemical reaction.

2) Anodic oxidation takes a long time, usually tens of minutes, while conductive oxidation takes only tens of seconds.

3) The film formed by anodic oxidation has several microns to tens of microns, and is hard and wear-resistant; the film formed by conductive oxidation is only 0.01-0.15 microns, and its wear resistance is not very good, but it can conduct electricity and resist atmospheric corrosion, which is its advantage.

4) The oxide film is not conductive, but because the film formed by conductive oxidation is very thin, it is conductive.