Why Anodizing Aluminum?

Mar 19, 2021

What's The Anodizing?
Anodizing is an electrochemical process that changes the surface of metal prototypes or parts. The oxide layer formed on the metal surface can improve corrosion resistance, improve aesthetics and prevent the surface from being scratched. It is an extremely durable post-treatment method.

How Is Aluminum Anodized?
The surface of the aluminum needs to be cleaned and rinsed, and then placed in an electrolyte containing sulfuric acid or chromic acid. Electrolyte is a conductive solution with a lot of positive and negative ions. The positive charge passes through the aluminum, and the negative charge is applied to the plate in the electrolyte. The current causes positive ions to be attracted to the negative plate, while negative ions are attracted to the positive stage of the aluminum plate, which is called the anode.

The electrochemical reaction results in the formation of holes on the aluminum surface, which corrode down to the base of the part in a uniform geometric pattern. The aluminum surface and the negatively charged ions combine to form alumina, also known as a barrier layer, which can prevent further oxidation and corrosion of the surface of the part.

 The two most commonly used variants of anodized aluminum process are Anodized type II and Anodized type III, in which type III is also called "hard anodizing", both of which use sulfuric acid and are suitable for coloration. Compared with type II, type III can provide better corrosion protection and wear resistance.

What Other Materials Can Be Anodized?
Anodizing is also suitable for metals such as magnesium and titanium. The oxide layer formed protects these parts from corrosion and damage by other chemicals. It is widely used in the architectural industry because it is cheap and durable.

The Benefits of Anodizing Aluminum Parts

  • Improved corrosion resistance

  • Improved product durability

  • Have better heat insulation effect

  • Increase the hardness of the surface

  • Improve wear resistance

  • Better base for coloring

The multi-vacancy layer produced by anodizing is very suitable for painting or coloring, provides a series of color finish options for aluminum parts.

Is the anodizing suitable for your parts?
Contact Youde today ,we would be happy to discuss your project details and provide a no-obligation quote for our services.