What is alumite(anodizing)　アルマイトとは

Anodizing (anodizing) is an electrolytic treatment of aluminum with an anode (+ electrode).
A surface treatment that artificially creates an oxide film (aluminum oxide).
The main component of alumite is said to be amorphous alumina (Al2O3).
Aluminum easily binds with oxygen and is very thin when exposed to air.
Creates an oxide film.
Because it is protected by this naturally made film, it is generally resistant to rust,
So-called corrosion resistance is said to be good.
However, since this film is very thin, chemical reactions may occur depending on the environment.
It will corrode.
Therefore, surface treatment to protect the surface, that is, alumite is required.

[Properties of anodized aluminum (advantages)]
❑ Corrosion resistance
Untreated aluminum is chemically active and sensitive to moisture, oxygen,
Because it easily reacts with chemicals, the surface is prone to discoloration and corrosion.
Alumite is formed from a chemically stable oxide film and is
Corrosion resistance can be improved by closing the micropores of the film.

❑ Wear resistance
The hardness of aluminum is Hv20-150 (depending on the alloy),
When alumite is applied, it improves to about Hv200-600.
Since wear resistance is also improved, improvement in sliding characteristics can be expected.

❑ Aesthetics
By adsorbing the dye to the micropores of the anodized aluminum film,
It can be colored in various colors.

❑ Insulation
Aluminum, which is a metal, conducts electricity, but the alumite film
Since it is aluminum oxide and has insulating properties, it does not conduct electricity.

❑Heat dissipation
Thermal conductivity is about one-third that of aluminum, but it is highly radioactive such as far-infrared rays.
It is also used for heat dissipation improvement treatment such as heat sinks.


[Properties of anodized aluminum (disadvantages)]
❑Fragile
Since the anodized aluminum film does not have flexibility, the member after anodized treatment
Bending or processing may cause the anodized aluminum film to crack or peel off.

❑Heat resistance
Normal alumite film will not
Cracks and peeling occur due to thermal expansion of the material.




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