Tech Tip: Anodization

TECHTIP

CONSIDERING SURFACE FINISH OPTIONS

THE IMPORTANCE OF ANODIZATION

Anodization Dened

Anodizing is an electrochemical process that converts the surface of aluminum into a durable,

corrosion-resistant nish, which is fully integrated with an underlying aluminum substrate so it cannot

chip or peel.

During anodization, an electric current is passed through aluminum that is immersed in an acid

electrolyte bath. This process creates highly controlled oxidation—the enhancement of a naturally

occurring phenomenon where aluminum oxide forms on exposed surfaces (Aluminum Anodizers

Council, AAC).

Benets of Anodized Aluminum

Durability

• The hard, weather-resistant layer of

anodization has a long life span.

Usability

• Cleans easily with mild soap and water

restoring the surface to its original

appearance.

• The smoother surface has less friction,

allowing parts to slide more easily in slots

than mill aluminum.

Aesthetics

• Provides a clean, “nished” look while

allowing the aluminum to maintain its

metallic appearance.

• Even with exposure to UV rays and

natural elements, the orginal color of the

anodized part will remain over its lifetime

Black Anodized Aluminum

Clear Anodized Aluminum

Mill Natural Aluminum

Examples of different surfaces in rails used for solar module mounting.

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TECHTIP CONSIDERING SURFACE FINISH OPTIONS THE IMPORTANCE OF ANODIZATION Anodization Defined Anodizing is an electrochemical process that converts the surface of aluminum into a durable, corrosion-resistant finish, which is fully integrated with an underlying aluminum substrate so it cannot chip or peel. During anodization, an electric current is passed through aluminum that is immersed in an acid electrolyte bath.
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TECHTIP Other Considerations Colored Anodized Aluminum Anodizing is a highly controlled oxidation where the porous surface oxide layer is “sealed” to complete the process. Sealing is accomplished by submerging the aluminum in warm water which hydrates the oxide and shrinks the pores. Putting dyes in the water during the process allows it to permeate the oxide layer, adding color to the aluminum surface.