Anodizing is a metal surface treatment process.it can be used in CNC machining parts ,
It refers to a material protection technology that forms an oxide film on the surface of a metal material in an electrolyte solution by applying an anodic current, also known as surface anodic oxidation.
After the metal material or product is anodized on the surface, its corrosion resistance, hardness, wear resistance, insulation and heat resistance are greatly improved. The most anodized metal material is aluminum. The anodization of aluminum is generally carried out in an acidic electrolyte, with aluminum as the anode. During the electrolysis process, the anion of oxygen interacts with aluminum to produce an oxide film. This kind of film is not dense enough when it is first formed. Although it has a certain resistance, the negative oxygen ions in the electrolyte can still reach the surface of aluminum and continue to form an oxide film. As the film thickness increases, the resistance also increases, and thus the electrolysis current decreases. At this time, the outer oxide film in contact with the electrolyte is chemically dissolved. When the rate of oxide formation on the aluminum surface is gradually balanced with the rate of chemical dissolution, the oxide film can reach the maximum thickness under this electrolysis parameter. The outer layer of the anodized film of aluminum is porous, and it is easy to absorb dyes and colored substances, so it can be dyed and improve its decorative properties. After the oxide film is sealed with hot water, high temperature steam or nickel salt, its corrosion resistance and wear resistance can be further improved.
In addition to aluminum, the metals used in industry for surface anodization include magnesium alloys, copper and copper alloys, zinc and zinc alloys, titanium alloys, steel, cadmium, tantalum, zirconium, etc.
Please heck some picture about anodizing as below:
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Post time: May-06-2022