Anodising often gets talked about as just a finishing step, but there’s more going on beneath the surface than many people realise. It’s used across engineering, construction, and design because it adds protection and flexibility.
There Are Several Types of Anodising
Not all anodising is the same. There are different types, each designed for a specific job. Type I uses chromic acid for a thin layer, Type II relies on sulphuric acid to create a thicker, colour friendly finish, and Type III produces a much harder coating for parts needing extra durability.
It Was First Used for Corrosion Protection
Anodising began to protect aluminium in harsh conditions. Early uses were in marine and aviation settings, where parts were exposed to moisture and corrosion. It worked so well that it quickly became a trusted industrial process.
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Colour Is Absorbed Not Painted
With anodising, colour isn’t painted on. Dyes soak into tiny pores in the metal, which is why anodised finishes last so well without peeling. Most colours work, although white isn’t possible because the pores are too small.
The Surface Is Grown Not Coated
Anodising doesn’t add a layer on top like paint or plating. It changes the surface by growing a tough oxide layer from the aluminium itself, making the finish far more durable.
It Is Considered Environmentally Efficient
Compared with many finishing processes, anodising produces fewer harmful by-products. Some residues can also be recycled, helping reduce overall waste.
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