Anodising and Conversion Coating
Anodising is an electrochemical process used to create a durable aluminium oxide layer on metal surfaces. It is frequently used for aluminium and its alloys, to improve corrosion resistance and durability.
Hard-anodised parts are suited to cleanroom environments, have a high melting point and are widely used in a range of industries including aerospace, automotive and manufacturing.
How it Works
Anodising is a rack-based process which can be controlled to achieve a specific thickness of the oxide layer. The greater the thickness, the more wear resistance. Thicker coatings are normally porous however, so a sealing process may then be needed to achieve the desired corrosion resistance.
Anodising can be applied to aluminium and its alloys, though the purer the aluminium, the better it will anodise. Alloys with a high silicon or copper content can present a more technical challenge.
Anodic (anodised) coatings are generally much stronger and more adherent than most paint and metal plating finishes, making them less prone to cracks and peeling over time. The finish may be more brittle however.
Hard Anodising Benefits
Hard anodising results in a thicker and more durable oxide layer. This layer is highly resistant to wear and corrosion, ideal for metal parts used in harsh environments.
Anodised parts are suitable for clean room operations, including laboratories, the food industry or medical environments. This is because anodising is chemically inert and does not flake off.
Aluminium oxide benefits from a high melting point, in the region of 2050°C, compared pure aluminium (658°C).
Get In Touch
Have a question or want to discuss your requirements?
Fill in the form below and a member of our team will be in touch shortly to help with your enquiry.