Anodic oxidation of aluminum oxidation

Aluminum is a relatively active metal, standard potential -1.66 V, in the air can naturally form a layer of about 0.01 ~ 0.1 micron thick oxide film, this layer of oxide film is amorphous, thin and porous, poor corrosion resistance. However, if the aluminum and its alloy are placed in the appropriate electrolyte, the aluminum products as the anode, under the action of external current, so that the surface of the oxide film, this method is called anodic oxidation.

By selecting different types of electrolyte with different concentrations, and controlling the process conditions of oxidation, anodic oxidation films with different properties and thickness of tens to hundreds of microns can be obtained, and their corrosion resistance, wear resistance and decoration have been significantly improved and improved. The electrolytes used for anodic oxidation of Al and aluminum alloys are generally acidic solutions with moderate solubility, and lead is used as the cathode, which only plays a conductive role. During anodic oxidation of aluminum and its alloys, the following reactions occur at the anode:

2Al ---> 6e- + 2Al3+

The following reactions occur at the cathode:

6H2O +6e- ---> 3H2 + 6OH-

At the same time, the acid dissolves the aluminum and the oxide film, and the reaction is as follows:

2Al + 6H+ ---> 2Al3+ +3H2

Al2O3 + 6H+ ---> 2Al3+ + 3H2O

The growth process of oxide film is the process of continuous formation and dissolution of oxide film.

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