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The Benefits of Type II Anodizing for Aluminum

Date Added: March 22, 2010 05:41:53 PM
Choosing to anodize a surface is a decision that can greatly affect the quality of a product’s finish. An anodized part can be characterized by its resistance to scratches, corrosion and general wear and tear, while maintaining a pleasing and reflective appearance. It provides insulation and an enhanced finish, as well as effectively protecting the surface of the product. While all anodizing processes can achieve this result, the Type II Anodizing process is the one most frequently used for aluminum applications.

Type II Anodizing is an electrochemical process that takes place in a sulfuric acid bath. When applied to aluminum, it allows the natural oxidation of the aluminum alloy to occur much more rapidly. The process is used in a number of applications worldwide within the automotive, aerospace, and medical industries. Based off the military specifications MIL-A-8625, it is often used for defense and military purposes.

Type II Anodizing has numerous benefits. The oxidation process creates an oxide layer that improves corrosion and wear resistance and makes for a harder finish; surfaces that have been treated with sulfuric anodize (Type II) have greater durability than surfaces treated with type I. It also provides good electrical insulation. The sealed part then becomes stain resistant, making it very easy to clean, and can resist temperatures as high as the melting point of the aluminum itself.

The smooth, clean surface makes it a top candidate for paint adhesion and dyeing - a big feature as it allows the parts to be finished in any number of different colors, which also assists in inventory control, part identification, and aesthetics. Its anti-corrosive properties make it an excellent choice for use in industrial, high humidity, marine, and aerospace conditions. The Type II Anodizing process is a good fit for aluminum alloys because it provides increased longevity for the part, and maintains its durability and physical appearance for many years, even in harsh conditions. Be sure to find a company that has the capability to process aluminum alloys, including all 2000, 6000, and 7000 series wrought alloys, as well as one that is compliant with both industry and military specifications for the Type II process.

For additional information about Type II Anodizing and other anodizing processes, contact Saporito Finishing, a Chicago metal finishing company, at (708) 222-5300 and online at