Most aluminum alloy prototypes are processed by CNC and are one of the most common metal prototypes. The surface treatment is usually oxidation. So why does the aluminum alloy prototype need to be oxidized? Let’s take a look at how aluminum alloy prototypes oxidize and what are the functions of aluminum alloy prototype oxidation.

Anodizing Type II Parts

Aluminum alloy prototype oxidation treatment process

Aluminum alloy prototype oxidation is a process commonly used by prototype factories for surface treatment of aluminum alloy prototypes. Sandblasting is usually required before oxidation, otherwise it will affect the aesthetics of the aluminum alloy prototype.
If the aluminum alloy prototype you want to make is of natural color, you only need to sand it smooth and then sandblast it.

Let’s talk about the issues that need to be paid attention to when sandblasting aluminum alloy prototypes before oxidation treatment:

  1. Before sandblasting aluminum alloy prototypes, the sand type and particle size must be selected.
  2. The sandblasting should be uniform, the sandblasting pressure should be consistent, the nozzle should move smoothly, and the spraying angle should be consistent. The gun should not be opened and closed directly against the part; the distance between the nozzle and the workpiece should be consistent.
  3. The process after sandblasting is: alkali etching-chemical polishing-anodizing-sealing-drying.

Conditions for coloring the oxide film of aluminum alloy prototypes

  1. The film layer is uniform and has a certain thickness;
  2. Have certain porosity and adsorption properties;
  3. The oxide film itself should be colorless and transparent;
  4. The oxide film should have no mechanical damage.

What electrolyte should be selected for anodizing?
1.The more widely used is sulfuric acid DC anodizing. Compared with other acid anodizing, it has obvious advantages in terms of production cost, characteristics and performance of the oxide film. The main advantages are as follows: 1. Low production cost, sulfuric acid used in the electrolyte The price is low, electrolysis consumes less electricity, and waste liquid treatment is simple, making it a relatively cheap process;

  1. The film has high transparency. Generally, the sulfuric acid oxide film is colorless and transparent, and the purer the aluminum, the better the film transparency;
  2. Good corrosion resistance and wear resistance;
  3. Electrolytic coloring and chemical dyeing are easy.

The role of oxidation of aluminum alloy prototype

  1. Prevent the surface of the prototype from being corroded and extend the service life of the product.
  2. Improve the aesthetics of the prototype. After the prototype is oxidized, the corresponding subsequent surface treatment such as oil spraying, wire drawing, and sandblasting can not only make the surface of the product beautiful and elegant, but also improve the quality of the product.

Determine whether to oxidize based on the usage of the part.

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