Cnc Machining Anodizing Aluminum Parts

Anodic oxidation is the electrochemical oxidation process of metals or alloys. The process in which aluminum and its alloys form an oxide film on aluminum products (anodes) under the action of an external current under corresponding electrolytes and specific process conditions. Anodizing usually refers to sulfuric acid anodizing, which utilizes electrochemical principles to generate a layer of Al2O3 (aluminum oxide) film on the surface of aluminum and aluminum alloys.

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‌ The main features of anodized aluminum include increased hardness, increased wear resistance, excellent corrosion resistance, good heat resistance and insulation, and can be presented in a variety of colors. ‌

‌ improve hardness and wear resistance ‌ : a layer of dense alumina film is formed on the surface of anodized aluminum oxide, which can significantly improve the hardness and wear resistance of the material. The hardness can reach 200 to 500HV, making the anodized aluminum perform well in the face of scratches and wear ‌1.

‌ Excellent corrosion resistance ‌ : the surface oxide film of anodized aluminum can effectively prevent direct contact between aluminum and air, thus resisting corrosion. This corrosion resistance enables anodized aluminum to be used in harsh environments for a long time without corrosion or oxidation

‌ Good heat resistance and insulation ‌ : the anodized aluminum plate has good heat resistance, and the melting point of the hard anodized film is up to 2320K. At the same time, it also has excellent insulation and breakdown resistance of up to 2000V, which makes anodized aluminum perform well in high temperature environments or electrical applications ‌

‌ can show a variety of colors ‌ : During the surface treatment of anodized aluminum oxide, electrolytic coloring technology can be used to make the material show a variety of colors and luster, which increases its decorative and aesthetic ‌

The difference between ‌‌ hard oxidation and ‌ common oxidation

Film thickness ‌ : The thickness of the hard oxide film is generally greater than 15μm, and the thickness of the ordinary oxide film is thinner.

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‌Surface state ‌ : the common oxidized surface is flat, the hard oxidized surface is rough.

‌Porosity ‌ : common oxidation porosity is high, hard oxidation porosity is low.

Hardness ‌ : general oxidation HV250-350, hard oxidation HV350-550

Application ‌ : Ordinary oxidation is mainly used for decoration, hard oxidation is mainly used for wear resistance, electric resistance and other functional occasions. ‌

‌Color ‌ : hard oxidation color is relatively simple, mainly black, natural, brown, etc., common oxidation color is diverse.

What are the common colors of aluminum anodizing?

‌Natural silver ‌ : This is the color of aluminum formed after cleaning and anodizing, the thickness of the oxide layer is about 5 to 10 nanometers, showing a silvery-white appearance.

‌Black ‌ : The black surface of aluminum is formed by coating it with an organic or metallic dye during the anodizing process. This black oxide layer is thicker and can absorb more light, resulting in a black color.

‌Gold and copper ‌ : These colors are created by coating a metallic dye on a layer of alumina. These dyes reflect different wavelengths of light, giving them a gold or copper color effect.

‌White ‌ : This is the most common base color of aluminum after anodizing, and its hue can be adjusted by controlling the oxidation time and process parameters, such as gray and dark green.

‌Bronzes and yellows ‌ : These colors are usually obtained by controlling the timing and conditions of anodizing, and can be further divided into shades such as deep bronzes, light bronzes, and yellow.

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