Knowledge

Why should aluminum sheet be anodized? Henan Henry Aluminum will analyze for you below.

Oxidation treatment can make the metal surface gloss last for a long time, the corrosion resistance and mechanical strength are improved, and the decorative appearance can be obtained by dyeing.

Oxidized aluminum sheet are used in many places. Here are some examples.

(1) Prevention of product corrosion: The film layer obtained by anodization has been properly sealed and has good stability in the atmosphere. No matter the oxide film obtained from sulfuric 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.

(2) Protection and decoration: On the oxide film with high transparency, the oxide film has the characteristics that it can absorb a variety of organic dyes or inorganic pigments. Various bright and colorful colors and patterns can be obtained on the oxide film. The emergence of new processes such as single oxidation multiple coloring, fireworks patterns, wood grain patterns, oxidation 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 lighters, gold pens and crafts.

(3) As a hard wear-resistant layer: In sulfuric acid or oxalic acid solutions, the thickness and thickness of the film can be obtained by adjusting the anodic oxidation process conditions to use the pores and absorption properties of the film layer to store the selected oil. Effectively used in working conditions under friction, and has the characteristics of lubrication and wear resistance, such as engine cylinders and pistons of automobiles and tractors.

(4) As an electrical insulation 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 For dielectric, you can also use alumina sheath as the outer sheath of the cable and use its surface as an insulation layer to replace the rubber sheath and plastic sheath. It is more popular abroad. When the film thickness is 27.5 μm, its breakdown voltage is 441V. If phenolic resin is used for film hole filling, its breakdown voltage can be doubled. When the film thickness is increased in an oxalic acid solution, a high-quality insulation layer with a resistance of 200Ω and a breakdown voltage of 980V can be obtained. Of course, this feature is used. In addition to wires, it can also be used in other electrical appliances.

(5) As the bottom layer for spray painting and electroplating: Because the oxide film layer has porosity and good adsorption ability, and has good binding force with paint film and organic film, it can be used as the bottom layer for spray painting. Phosphoric acid anodized film can be used as the bottom layer for electroplating on aluminum.

(6) For modern construction: Due to the introduction of aluminum alloy electrolytic coloring technology, domestic electrolytic coloring has been increasing in construction aluminum profiles in recent years. It not only has bronze, black, red, etc. suitable for architectural hue, and has excellent wear resistance. For general conventional oxidation, it is particularly worth mentioning that it has very good light resistance. It will not fade in the atmosphere after more than 20 years of sun exposure, which is incomparable with the oxidation coloring method. The aluminum profile oxidized by electrolytic coloring method can be used not only for building doors and windows, but also for shop counters and shelves.

The above is the knowledge of aluminum sheet for oxidation and aluminum plate application. I am glad to share the knowledge with you and make progress together.