Hongfa Shunda Aluminum Enclosure Surface Treatment-anodizing

- Mar 05, 2019-

The purpose of this article is to make you to know Hongfa Shunda aluminum case more easily,then help you to custom the correct color and choose the most suitable aluminum box for your products.

About Anodizing


Anodizing is a simple electrochemical process developed more than 75 years ago that forms a protective coating of aluminum oxide on the surface of the aluminum. The lifetime of the finish is proportional to the thickness of the anodic coating applied.
Aluminum oxide is a hard, durable, weather resistant substance that protects the base metal. The coating may be colored by dyeing or may exhibit bronze tones through diffraction phenomena produced by the coating. The coating grows from the base aluminum metal by this electrochemical process. The coating is integral to the metal and can not peel or flake. The structure of the coating is many small hexagonal pores, which are filled with a “seal” that hydrolyzes these pores to fill them with inert aluminum oxide


Strengths Of Anodizing


1.    In general anodizing is lower cost than painting with the exception of coil painted products.

2.    Anodizing is harder than PVDF. Anodizing is better for aluminum in high traffic areas where the coating is subject to physical abuse and abrasive cleaners.

3.    Anodizing cannot peel off. The coating is actually part of the metal.

4.    Anodizing gives aluminum a deeper, richer metallic appearance than is possible with organic coatings. This is because an anodized coating is translucent, and one can see the base metal underneath the coating. This translucence contributes to color variation problems, but anodizers are doing a much better job of controlling the amount of color variation than in the past. Computerized color matching with quantitative, objective color data is now commonplace in most anodizing facilities.

5. Anodizing is unaffected by sunlight. All organic coatings will eventually fail due to exposure to ultra-violet light.

Anodizing process

In the anodizing process, extruded aluminum parts — following a series of cleaning, rinse and etch steps — are immersed in an acid electrolyte bath and an electrical current is passed through the solution. A cathode is mounted to the inside of the anodizing tank, while the aluminum extrusions act as an anode. Oxygen ions are released from the electrolyte and combine with aluminum atoms at the surface of the extrusion being anodized, thereby creating an aluminum oxide layer fully integrated with the underlying aluminum. Dyes can subsequently be applied, with the final step a sealing stage to enhance durability and prevent corrosion.