Anodising converts an aluminium surface into a controlled oxide that is integral, hard, and stable. Part of the layer grows into the metal and part builds above it, so dimensional change is modest when specified correctly. As pores accept dye before sealing, the process delivers colour options alongside dependable wear and corrosion resistance. From bike components to architectural trims, a well-run line produces consistent finishes for everyday and demanding applications.
How anodising works
Parts are cleaned, etched, and racked for good electrical contact, then immersed as the anode in a sulphuric electrolyte while the current builds the oxide. Temperature, acid strength, and current density steer thickness, hardness, and dye take-up. After rinsing, optional colouring and a final hot-water or nickel acetate seal closes the pores.
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Six benefits
- Corrosion resistance increases markedly once sealed.
- Durability improves as surface hardness rises.
- Coatings are thin and light, so weight targets remain intact.
- Adhesion for paints and solid lubricants is better due to porosity.
- Colours and textures are versatile, from clear satin to deep black.
- Costs scale well for batches.
Finishes, care, and uses
Choose alloys that anodise cleanly, specify thickness and colour early, and request test coupons where tolerances are tight. Maintenance is straightforward: wash with mild detergent, avoid abrasives, and reseal only for harsh exposure. Hard anodising suits valve parts, tooling, optical housings, and cycle components.
With sound preparation and sealing, anodised aluminium balances appearance, longevity, and cost.