الأنودة هي عملية كهروكيميائية تستخدم لزيادة سمك ومتانة طبقة الأكسيد الطبيعي على سطح الأجزاء المعدنية, عادة الألومنيوم. The process involves immersing the metal part in an electrolyte bath and applying a current to the part, which causes the formation of a thicker and more stable oxide layer on the surface.

Anodizing can also be used to add color to the surface of the metal part by using dyes or pigments during the anodizing process. The benefits of anodizing include improved corrosion resistance, improved durability, and the ability to add color to the surface of the metal part without the need for paint or other coatings.