Sulphuric acid anodising is one of the most widely used techniques for enhancing the performance and durability of aluminium components. Recognised across engineering and manufacturing sectors, the process offers a reliable way to improve surface hardness, corrosion resistance and overall component longevity.
How the Process Works
Sulphuric acid anodising involves immersing aluminium in an electrolytic bath and passing a direct current through the solution. This transforms the outer metal layer into aluminium oxide, creating a surface that is harder and more resistant than untreated aluminium.
Once the anodic layer has formed, components are sealed in hot water or specialist solutions to close the microscopic pores and improve corrosion resistance. The final finish can vary depending on type, preparation and treatment, meaning careful process control is essential for consistency.
Why Sulphuric Acid Anodising Is Valued
The technique, which is used by https://www.poeton.co.uk/surface-treatments/anodising/sulphuric-acid-anodising, is widely adopted for its balance of performance and cost-efficiency. Sulphuric acid anodising suits a broad range of aluminium grades and can create coatings with typical thicknesses of 5-25 µm. These films offer good corrosion resistance, improved wear performance and an electrically insulating surface, making them suitable for applications ranging from consumer products to aerospace components.
Because the oxide layer forms as a conversion of the aluminium surface, it is both durable and metallurgically bonded to the substrate. However, the process may highlight imperfections, so surface preparation remains an important part of achieving a uniform appearance.
With its combination of practicality and proven performance, sulphuric acid anodising continues to play a central role in modern materials engineering.