What is hard anodizing?（1）

Hard anodizing, also known as hard coating or type III anodizing, is a process used to form wear-resistant and corrosion-resistant coatings on various metals. Anodizing can be divided into two categories: decorative and hard anode screams. The main difference between the two is the thickness and durability of the coating and the exact process used to create the coating.

Anodizing process

Anodizing a metal part involves placing it in a conductive liquid, commonly referred to as an acidic solution, known as an electrolyte. The circuit has a positive electrode (cathode) where electrons enter and a negative electrode (anode) where they leave; in anodization, the metal part becomes a negative electrode. When current passes through the solution, the action of the electrons that leave the circuit through the metal parts results in the accumulation of a tough, corrosion-resistant oxide coating. The coating can be left as it is after treatment, or further enhanced with decorative dyes and other performance-improving additives

Process Manufacturing Hard anodized parts differ from decorative coatings in several ways. It uses usually higher currents and a slightly weaker electrolyte solution. The temperature of the electrolyte solution is also lower, so that the deformation of precision components is smaller and the adhesion of the coating is better. In general, the anodizing process is also considered to be relatively environmentally friendly, and the by-products are recyclable.