Hard anodizing, also known as Type III anodizing, is a specialized anodizing process designed to create a thick, hard, and highly wear-resistant oxide layer on aluminum and its alloys. Unlike standard (Type II) anodizing, which is primarily used for decorative purposes, hard anodizing focuses on functionality, providing exceptional durability, abrasion resistance, and corrosion protection.
The process is performed under tightly controlled conditions, typically at low temperatures and using higher current densities, which result in a denser and thicker oxide layer. This makes hard anodizing ideal for applications in aerospace, military, automotive, and industrial machinery, where components are subjected to extreme wear or harsh environments.
