Question

what is annodising?​

Answer 1

Answer:

coat (a metal, especially aluminium) with a protective oxide layer by an electrolytic process in which the metal forms the anode.

"the anodized frames

Answer 2

Anodising is an electrolytic process for producing thick oxide coatings, usually on aluminium and its alloys. The oxide layer is typically 5 to 30µm in thickness and is used to give improved surface resistance to wear and corrosion, or as a decorative layer.