Mechanical Knowledge

How Many Anodizing Colors We Could Support For Your CNC Machined Parts?

Aluminum anodizing is an electrochemical process in which an oxide (anodic) layer is chemically built on the surface of the metal. This oxide layer acts as an insulator and can be dyed in a wide variety of colors. Anodizing provides surface corrosion protection along with an excellent substrate for decorative finishes. Firstly we would like to share some basic information for the process of the anodizing.

1. How is Aluminum Anodized?
To prepare aluminum for anodizing, the surface is first thoroughly cleaned and rinsed and then placed into a bath of some electrolytic solution like sulfuric acid. An electrolyte is an electrically conductive solution with lots of positive and negative ions that it wants to swap.
A positive electric charge is applied to the aluminum, making it the “anode”, while a negative charge is applied to plates suspended in the electrolyte. The electric current in this circuit causes positive ions to be attracted to the negative plates, and negative ions to flock to the positive anode, the piece of aluminum.

2. How is Color Added to Metal Anodizing?
Colored aluminum is what most of us picture when we think of anodizing. That’s the real genius of this process. The nice, stable pores etched into the surface are ideal for introducing tints or pigments.
The pigment fills all the empty pores up to the surface, where it’s then permanently sealed off. That’s why anodized colors are so durable – they can’t be scratched off from the surface because in fact the colors are deep down and can only be removed by grinding away the substrate.

3. Why is it Impossible to Anodize an Entire Part?
Anodizing requires that a part is immersed in a series of chemical baths. Holding a part in position requires that it be mounted on a hanger of some kind to keep it from falling to the bottom of the tank. Wherever the holding fixture touches the part, that area will be blocked and the anodizing chemicals won’t work properly. That’s why it’s smart to design a place on your part which can be used for holding but which won’t be adversely affected cosmetically.

So if you are looking to add color to your anodized products without losing the protective and functional characteristics of anodized aluminum, just let us know!

KUNSHAN DESHENGRUI MACHINERY CO., LTD can provide CNC Machining service, which specialized in developing, manufacturing and exporting mechanical products for many years. You can contact us to talk about the process, we can be reached by email rita@desheng-precision.com.

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