What is Anodizing? PDF Print E-mail

• Anodizing is NOT painting
• Anodizing is NOT laquering or clear-coating
• Anodizing is NOT a surface only treatment

Anodizing is an electrochemical process that converts metal into a decorative, durable, corrosion-resistant, anodic oxide finish. Aluminum is ideally suited to anodizing, although other nonferrous metals, such as titanium, can also be anodized.

Anodizing is accomplished by immersing the aluminum in an acid bath through which an electric current is passed. As the current is applied a chemical process takes place on and into the surface of the aluminum part giving it a durable, pentrating, aluminum oxide layer. The structure of the aluminum oxide allows it to be dyed, not only on the surface but into it, integrating the color into the metal itself.


Anodizing's Benefits

The unique anodized finish is the only one in the metals industry that satisfies each of the factors that must be considered when selecting a high performance aluminum finish:

  • Durability. Most anodized products have an extremely long life span and offer significant economic advantages through maintenance and operating savings. Anodizing is a reacted finish that is integrated with the underlying aluminum for total bonding and unmatched adhesion.
  • Color Stability. Exterior anodic coatings provide good stability to ultraviolet rays and do not chip or peel.
  • Ease of Maintenance. Scars and wear from fabrication, handling, installation, frequent surface dirt cleaning and usage are virtually non-existent.
  • Aesthetics. Anodizing offers a large number of gloss and color choices and minimizes or eliminates color variations. Unlike other finishes, anodizing allows the aluminum to maintain its metallic appearance.
  • Health and Safety. Anodizing is a safe process that is not harmful to human health. An anodized finish is chemically stable, will not decompose; is non-toxic; and is heat-resistant to the melting point of aluminum (1,221 degrees F.) Because the anodizing process is a reinforcement of a naturally occurring oxide process, it is non-hazardous and produces no harmful or dangerous by-products.