How Much Do You Know About Aluminum Anodized?

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There are two main methods of anodized treatment of aluminum and aluminum alloys:

Chemical Anodized

  The anodized film is thin, with a thickness of about 0.5 to 4 μm, and is porous, soft, and has good adsorption properties. It can be used as the bottom layer of organic coatings, but its wear resistance and corrosion resistance are not as good as anodic oxide films;The chemical anodization treatment equipment of aluminum and aluminum alloys is simple, easy to operate, high production efficiency, does not consume electricity, has a wide range of applications, and is not limited by the size and shape of parts.

  The process of chemical anodization of aluminum and aluminum alloys can be divided into two categories: alkaline oxidation and acid oxidation according to their solution properties.According to the film properties, it can be divided into: anodized film, phosphate film, chromate film, chromate-phosphate film.

Anodzing

   Aluminum is a relatively active metal with a standard potential of -1.66v. It can naturally form an oxide film with a thickness of about 0.01 to 0.1 microns in the air. This oxide film is amorphous, thin and porous, and has poor corrosion resistance. However, if aluminum and its alloys are placed in a suitable electrolyte, the aluminum product is used as the anode, and an oxide film is formed on the surface under the action of an applied current. This method is called anodic oxidation.

  By selecting different types and concentrations of electrolytes and controlling the process conditions during oxidation, anodized films with different properties and thicknesses of about tens to hundreds of microns can be obtained. etc. have been significantly improved and improved.

Process

   There are many anodizing methods for aluminum and its aluminum alloys, commonly used are sulfuric acid anodizing, chromic acid anodizing, oxalic acid anodizing, hard anodizing and porcelain anodizing.

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