Film layer after anodising of aluminium discs

Film layer after anodising of aluminium discs

The anodic oxidation process results in a dense film layer (from tens to hundreds of microns) on the surface of the aluminium disc and its aluminium alloy discs that is much thicker than the natural oxide film. This layer of artificial oxide film is then closed, and the crystalline oxide film is transformed into a crystalline oxide film, and the pores are also closed, so that the surface gloss of aluminium alloy discs can remain unchanged for a long time, and the corrosion resistance and mechanical strength are improved, and a decorative appearance can be obtained by dyeing. Today, we will take a look at the hard wear-resistant layer and the electrical insulation layer that will appear after the anodic oxidation treatment of aluminium alloy discs.

Let's start by looking at the hard wear layer that occurs after anodising. In sulphuric acid or oxalic acid solution can be adjusted by the anodising process conditions to obtain a thick and hard film layer, using the pore and absorption properties of the film layer to store the selective oil, effectively applied to the conditions of work in the friction state, while having the characteristics of lubrication and wear resistance, such as the engine cylinder and piston of the car and tractor.

Let's look together again at the insulating layer of electricity that occurs after the anodic oxidation treatment of aluminium alloy rounds. The oxide layer of aluminium and its alloy has the characteristic of large resistance, the thickness of the film layer is proportional to the resistance, this characteristic has certain practical significance as electrical insulation, it can be used as a dielectric for capacitors, also can use aluminium oxide as the outer skin of cables, for its surface as an insulating layer to replace the rubber skin and plastic skin in the international more popular, the film thickness is 27.5μm, its wear voltage is 441V. if the use of Phenolic resin for the film hole filling, its penetration voltage can be increased by 2 times, in oxalic acid solution, when the film thickness increases, can obtain resistance 200Ω, breakdown voltage of 980V quality insulation layer, of course, the use of this feature in addition to the wire, can also be used for other aluminum disc manufacturing of household appliances and other aspects.