Aluminum Anodizing Process

What is Anodizing?

By definition, anodizing is "a process to electrolytically coat a metallic surface  with a protective or decorative oxide." The anodic coating consists of hydrated aluminum oxide and is considered resistant to corrosion and abrasion. Coatings are 0.1 to 1.0 mil thick and are essentially transparent, although they may be colored.

Unlike most other finishes, anodizing preserves the natural luster, texture, and beauty of the metal itself. The anodized coating is hard, durable, will never peel, and, under normal conditions, will never wear through.

The Anodizing Process

The Anodizing process begins by immersing the work in a series of solutions where various operations are performed (described below). The solutions are held in open top tanks and the work passes through each unit. The work usually consists of distinct items that are placed on special racks and carried through the process in batches.

Overhead cranes move the racks from one tank to the next. Superior"s facilities have multiple overhead cranes to increase productivity and minimize "down-time." The work is rinsed thoroughly after each operation to avoid contamination and interference in the next solution.