When it comes to aluminium surface treatments, anodising is one of the most effective and durable options available, especially for parts that have been machined to precise specifications. While mass anodisation by batch or bath immersion is common, piece-by-piece anodising after machining is preferred for high-value applications requiring precision, consistency, and optimal surface performance.
Why anodise after machining?
Anodising aluminium after machining ensures that the protective and aesthetic finish covers only the final, exact geometry of the part. This is crucial for components with tight tolerances, complex shapes, or critical contact points. If you anodise a profile before machining, the process of cutting, drilling, or milling can damage the anodic layer—compromising both corrosion resistance and visual finish.
By anodising post-machining, you get:
• Uniform coating on all surfaces
• Protected edges and contact faces
• Improved durability and lifespan
• A flawless, high-end finish
What is piece-by-piece anodisation
Unlike bulk anodising, where parts are submerged in batches, piece-by-piece anodisation refers to treating each machined part individually, either in controlled racks or with specific fixturing. This method allows for:
• Greater quality control
• Tailored thicknesses (e.g. 5µm, 10µm, 15µm+ depending on the application)
• Custom colour anodising
• Reduced risk of contact marks or uneven finish
It’s especially beneficial for sectors where aesthetics and performance are non-negotiable.
Anodisation process overview
The anodising process involves immersing the aluminium part in an electrolytic bath. A controlled current causes oxygen ions to bond with the aluminium surface, forming a layer of aluminium oxide. This oxide layer is:
• Harder than the base metal
• Electrically insulating
• Highly corrosion-resistant
• Porous at first, allowing for dyeing or sealing
ALUCAD offers full control over the anodising parameters—thickness, colour, and sealing—to meet any project’s technical and visual requirements.
Contact us today and discover how our piece-by-piece anodising services can elevate your aluminium components.