Aluminum anodizing

The part to be treated forms the anode electrode of the electrical circuit. Anodizing is a rather simple process where aluminum is immersed into an acid electrolyte bath and electrical current is passed through the medium. There are cathodes located on the sides of the anodizing tank and the aluminum pieces act as an anode. Oxygen ions are released from electrolytes to combine with the aluminum atoms at the surface of the part being anodized.

Anodic films can also be used for a number of cosmetic effects, either with thick porous coatings that can absorb dyes or with thin transparent coatings that are thick enough interfere with reflected light.Aluminum alloys are anodized to increase corrosion resistance and to allow dyeing (coloring) and also increases lubrication as well as improved adhesion. The anodic layer is non-conductive.

Anodizing is also used to prevent galling of threaded components and to make dielectric films for electrolytic capacitors.

Anodic films are most commonly applied to protect aluminum alloys.The most common anodizing processes, for example sulfuric acid on aluminum, produce a porous surface which can accept dyes easily. Colors available are virtually endless but are limited to the base alloy and fastness ratings range depending on colors carried in each shop.

Benefits

• Anodized products boast an extremely long life span. Their reacted finish is integrated with the underlying aluminum for total bonding and unmatched adhesion.
• Anodic coatings are easily repeatable, wiill not chip or peel and can withstand ultraviolet rays.
• Anodizing creates a non conductive coating compared to chemical conversion coatings that provide low electrical resistance and preserve electrical conductivity.
• Anodizing combines a lower initial finishing cost combines with lower maintenance costs for greater long-term value.
• Anodizing allows parts to maintain the original metallic finish unlike other types of finishes.
• Anodizing makes maintenance easy – Rinsing parts with mild soap and water will restore the part to its original anodized state.