What is the difference between anodizing and chemical oxidation of aluminum profiles?
Release time:
2020-06-28 17:28
The concept of anodic oxidation
1.The concept of anodic oxidation
2. The role of anodic oxidation
(1) protection: improve the wear resistance, corrosion resistance and weather corrosion resistance of parts.
(2) decorative: made of natural color bright film, as a color film.
(3) Insulation: As a capacitor dielectric film, aluminum wire coil insulating film can withstand 25V per micron thickness.
(4) Improve the binding force with the organic coating: as the bottom coating.
(5) to improve the bonding force with the inorganic coating layer: as the bottom layer of electroplating and enamel.
(6) Other functions under development: depositing magnetic alloys in porous films for memory elements, solar absorption panels, ultra-high hard films, dry lubrication films, catalyst films, etc.
Chemical oxidation process of aluminum profile
1. The concept of chemical oxidation
The surface of aluminum profile is treated with chemical medium, and the surface is oxidized through chemical reaction to generate a stable anti-rust oxide film, which is called chemical oxidation treatment of aluminum profile. The process of chemical oxidation can be divided into two categories according to the nature of its solution: alkaline oxidation and acidic oxidation.
2, the role of chemical oxidation
(1) Strengthen the anti-rust ability of aluminum alloy.
(2) can play the role of stable contact electric negative.
(3) The conversion film is thin (about 0.5 ~ 4um), soft, conductive, porous, and has good adsorption capacity. It is usually used as the bottom layer of paint or other coatings.
(4) Do not change the mechanical properties of the material.
(5) The equipment is simple, easy to operate and cheap.
(6) does not affect the size of the workpiece.
The difference between anodic oxidation and chemical oxidation of aluminum profiles
(1) Anodic oxidation is carried out under the condition of high-voltage electricity. It is an electrochemical reaction process; chemical oxidation does not require electricity, but only needs to be soaked in liquid medicine. It is a pure chemical reaction.
(2) Anodic oxidation takes a long time, often tens of minutes, while chemical oxidation takes only tens of seconds.
(3) the anodic oxidation of the oxide film thickness of about 5-20 microns (hard anodic oxide film thickness of up to 60-200 microns), with high hardness, good heat resistance and insulation, corrosion resistance is higher than the chemical oxide film, porous, has a good adsorption capacity. The film generated by chemical oxidation is only about 0.01-0.15 microns, soft and not wear-resistant, corrosion resistance is lower than the anodic oxide film, generally should not be used alone.
(4) The oxide film is originally non-conductive, but because the film generated by chemical oxidation is really thin, it can be conductive.
(5) The equipment required for chemical oxidation treatment is simple, easy to operate, high production efficiency and low cost, and has a wide range of applications. It is not limited by the size and shape of the parts. It can oxidize large parts and assemblies (such as spot welds, rivets, Slender pipes, etc.). Coating after chemical oxidation can effectively improve the corrosion resistance of parts.
Aluminum dye
Pionmi Innovation & Technology
Telephone
Mailbox
Address
Room 1404-1406, Block C4, Grand Tech Park, No. 28 Kaitai Avenue, Huangpu District, Guangzhou City