Hard oxidation processing technology method:

There are many methods of hard anodizing electrolysis, for example: sulfur. Acid, oxalic acid, sulfosalicylic acid and other inorganic salts and organic acids. The power supply can be divided into DC, AC, AC and DC superposition, pulse and superimposed pulse power supply, etc. The following hard anodizations are widely used at present.

(1) Sulfur. Acid hard anodizing method;

(2) Hard anodic oxidation of oxalic acid.

(3) Mixed acid type hard anodizing Among them, the sulfur-acid method is a hard oxidation method that is widely used at present.

The role and application of hard oxidation

As a hard wear-resistant layer: in sulfur, acid or oxalic acid solution, it is possible to obtain a thick and hard film layer by adjusting the process conditions of anodizing. The pores and absorption properties of the film layer are used to store the selected oil, which is effective It is applied to the working conditions under friction and has the characteristics of lubrication and wear resistance, such as engine cylinders and pistons of automobiles and tractors.

As an electrical insulating layer: the oxide film layer of aluminum and its alloy has the characteristics of large resistance, and the thickness of the film layer is proportional to the resistance. This feature has certain practical significance as electrical insulation, and can be used as a capacitor dielectric Alumina skin can also be used as the outer sheath of the cable, and its surface is used as an insulating layer to replace the plastic sheath and plastic sheath. It is more popular abroad. When the film thickness is 27.5 μm, the penetration voltage is 441V.

The role and application of hard oxidation to prevent product corrosion: due to the proper sealing treatment of the film obtained by anodizing, it has good stability in the atmosphere. Whether it is obtained from sulfur, acid solution, oxalic acid solution or chromic acid solution in the normal process, its corrosion resistance is very good, such as daily aluminum pots, pots, washing machine liners, etc. The chromic acid oxidation method is particularly suitable for aluminum welded parts and riveted parts. Protection and decoration: On the oxide film with high transparency, the oxide film has the characteristics of absorbing a variety of organic dyes or inorganic pigments, and various bright and bright colors and patterns can be obtained on the oxide film, plus many new processes in recent years The appearance of such as multiple oxidation of one color, fireworks pattern, wood grain pattern, oxidized offset printing, porcelain oxidation, etc., make the appearance of aluminum more beautiful and pleasing. This color film is both a decorative layer and an anti-corrosion layer, such as a lighter , Gold pens and crafts.