What property does anodising enhance in aluminium?

Anodising is an electrochemical process that converts the surface of aluminium into a decorative, durable, corrosion-resistant oxide finish. This process enhances the natural oxide layer on aluminium, making it thicker and more protective. The anodised surface is particularly effective at preventing corrosion because it creates a barrier that inhibits the exposure of the underlying metal to moisture and corrosive elements.

Unlike the properties of flexibility, electrical conductivity, or weight, which are not significantly altered by the anodising process, corrosion resistance is greatly improved. The thicker oxide layer acts as a shield, ensuring that aluminium parts can withstand harsher environments, thereby prolonging their lifespan and maintaining their structural integrity. Thus, the most accurate answer regarding what property anodising enhances in aluminium is corrosion resistance.