Sulphuric acid anodising is one of the most common ways aluminium is treated, and there’s a good reason it’s used so often. It strikes a nice balance between durability, reliability, and practicality. The process creates a controlled oxide layer that protects the metal without changing its shape or appearance, which makes it suitable for a wide range of everyday applications.
How the Process Works
With sulphuric acid anodising, aluminium parts are placed into a sulphuric acid solution, and an electric current is passed through them. This triggers a reaction that turns the surface of the metal into a tough oxide layer, rather than simply coating it with something on top. The thickness can be carefully controlled, usually between 2.5 and 25 microns, so parts are protected without changing their size.
For those interested in learning more about sulphuric acid anodising, consider reaching out to a specialist such as www.poeton.co.uk/surface-treatments/anodising/sulphuric-acid-anodising.
The Importance of Porosity
One of the biggest advantages of sulphuric acid anodising is the porous surface it creates. That surface has tiny pores which let dyes soak in evenly, giving you consistent and long-lasting colour. It also helps paints, primers, and sealants stick better, which means products tend to last longer whether they’re decorative or designed for everyday use.
Cost and Practical Benefits
Compared with other anodising methods, sulphuric acid anodising is a practical and cost-effective option. The chemicals aren’t expensive, it runs at moderate temperatures, and it avoids some of the harsher processes used elsewhere, which makes it easier and more economical to use
