How Does Hard Anodising Differ from Other Anodising Methods

Anodising is a popular finishing process for aluminium, improving durability and corrosion resistance. Several anodising methods exist, but each offers different results. Hard anodising is often chosen when components must perform in demanding environments.

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Thickness and Strength

The main difference between standard decorative finishing and hard anodising is the thickness of the oxide layer created on the surface of the material. Whilst standard decorative provides a good finish and some wear protection, hard anodising produces a thicker, harder layer that also provides increased toughness and resistance to scratching.

Because of this extra density, hard anodising is widely used on parts exposed to friction or repeated movement.

For those wanting to know more about hard anodising, consider reaching out to a specialist such as poeton.co.uk/surface-treatments/anodising/hard-anodising.

Process and Performance

Hard anodising is carried out at a lower temperature with a controlled current to produce a harder oxide than other types of anodising. Other types have a greater emphasis on colour consistency and are used for cosmetic finishes. The resulting surface can offer improved heat resistance, electrical insulation and corrosion protection.

Typical Uses

Decorative anodising is carried out on consumer products, articles of general use, architectural components and other items where appearance is important. Hard Anodising is used where parts are subject to heavy loading, pressure, wear, friction or stress. It is particularly common in the engineering field for items such as hydraulic components, valves, aerospace components and other high stress applications.

Understanding these differences helps manufacturers choose a finish that balances cost, appearance and long-term performance.