ANODIZING

REID METAL FINISHING

WHAT IS ANODIZING?

Aluminum anodizing is an electrochemical process by which aluminum is converted into aluminum oxide on the surface of a part. This coating provides increased corrosion resistance and durability, the ability to be colored through dyeing, electrical insulation, and also acts as an excellent base for primer and for secondary coatings.

TYPES OF ANODIZING

CHROMIC ANODIZING

Chromic Anodizing, also known as Type I,  is a form of anodizing that creates the thinnest coatings, approximately .05 to .1 mils thick. Chromic anodizing is a good choice for a part that is complex and difficult to rinse because chromic acid is less corrosive than the sulfuric acid used in other anodizing methods. Chromic anodizing is commonly used for flight aluminum components that are involved in high-stress situations, such as landing gear.

SULFURIC ANODIZING

Sulfuric Anodizing, also known as Type II, is a form of anodizing that yields coatings less than 1 mil thick. Although it offers mild abrasion resistance, it is more durable than chromic anodizing. Like most anodization methods, corrosion resistance is excellent. The most desirable feature of this form of anodizing would be the excellent results from dyeing—yielding deep and rich colors.

HARDCOAT ANODIZING

Hardcoat Anodizing, or Type III, uses sulfuric acid electrolytes at a lower temperature, and its claim to fame is wear resistance. Hardcoat will produce a Rockwell C-scale rating of 60-70. This makes it an excellent candidate for many wear situations. Products that benefit from Hardcoat Anodizing include – Military, Aerospace, and Medical.

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