Hard anodising is an advanced electrochemical process that creates a thick, dense, wear-resistant oxide layer on aluminium. It’s commonly used in demanding industrial applications where components are exposed to friction, extreme temperatures, or corrosive environments.
If you have questions about this process, we’ve answered four of the most frequently asked ones here:
How Is Hard Anodising Different From Standard Anodising?
The main difference between hard and standard anodising is the thickness and hardness of the oxide layer.
Hard anodising produces a much thicker coating, typically under lower temperatures and higher current densities. This results in a surface that’s far more wear-resistant and often darker in appearance compared to standard anodised finishes.
What Is Hard Anodising Used For?
Hard anodising, like that offered by companies like www.poeton.co.uk/surface-treatments/anodising/hard-anodising, improves the durability and lifespan of aluminium parts that experience heavy wear and tear.
The process is commonly used on components in aerospace, automotive, defence, hydraulic systems, and industrial machinery. It creates a tough surface that can withstand abrasion, reducing maintenance and replacement costs over time.
Is Hard Anodised Aluminium Corrosion Resistant?
Yes, hard anodised aluminium offers strong corrosion resistance due to the dense oxide layer formed on the surface. While it’s highly effective in many environments, the performance can vary depending on sealing quality and exposure conditions.
Can Hard Anodised Surfaces Be Coloured?
Hard anodised surfaces are usually not dyed in bright colours because the thicker coating limits colour absorption. Instead, they tend to have a natural dark grey or black finish, which is often preferred in industrial and technical applications.