【China Aluminum Network】 In the acidic electrolyte, aluminum as the anode, after the electrolytic oxidation of the aluminum surface of the material protection technology. Anodized aluminum has a variety of electrolytes, but is basically formulated with sulfuric acid, chromic acid, oxalic acid or boric acid as the main component. One of the more commonly used is sulfuric acid based. The power supply can be DC, AC or AC. The voltage is between 5 and 25 volts and the temperature is below 25°C.

In the electrolysis process, oxygen anions react with aluminum to produce an oxide film. The initial formation of this kind of film is not compact enough and has a certain resistance, so that the negative oxygen ions in the electrolyte can still reach the aluminum surface to form an oxide film. As the film thickness increases, the resistance increases, and the electrolytic current becomes smaller. When the outer oxide film in contact with the electrolyte dissolves at the same time, the rate of oxide formation on the aluminum surface gradually becomes equal to the speed of chemical dissolution. The oxide film can reach a larger thickness under this electrolytic parameter. The structure of the anodic oxide film of aluminum is different from that of other conversion films. A dense layer of 0.01 to 0.1 μm is formed near the metal portion of the base metal, and a honeycomb layer composed of a plurality of hollow hexagonal prisms is formed thereon, and the total thickness is 2 to 100 Micrometers range. The anodized film produced by various electrolytes has different shades of color, some of which are monolithic in color and are used in the construction industry. Some of them can be dyed or used in hydrolysis and metathesis to deposit the formed pigment in the hollow part of the hexagonal column. Beauty.

It also needs to be closed and dried later. Aluminum materials with anodic aluminum oxide films are sometimes more resistant to corrosion than chromated aluminum materials. This aluminum material is widely used in the construction industry and daily hardware products, but also in aircraft, automobiles, and civilian ships. Utilizing a low-temperature, weak electrolyte and a high voltage (100 to 150 V), a hard anodized film can be formed for use in mechanical parts and hydraulic components that come in contact with fibers, paper, and rubber. Filling PTFE in the hexagonal hollow of the common anodized aluminum layer can obtain extremely low friction coefficient parts.

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