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Anodized Aluminum: Learn Its Properties And Common Classifications
Time: 2023-11-20
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What is anodized aluminum?

Anodized aluminum is a multifunctional material that refers to a layer of dense aluminum oxide coated on the surface of aluminum and aluminum alloys. In order to prevent further oxidation, its chemical properties are the same as aluminum oxide. It can utilize the colorless and porous nature of the anodized film to achieve the purpose of dyeing and protecting the aluminum matrix. The preparation principle is the anode effect (also known as anodization).

 Anodized Aluminum

Features of anodized aluminum:

1. Wear and corrosion resistance: The surface of anodized aluminum is harder than ordinary aluminum, which makes it more resistant to scratches and wear. At the same time, the oxide film formed after anodizing on the surface can effectively isolate the erosion of external substances and protect the aluminum plate from corrosion damage. This allows anodized aluminum to maintain stable performance in various corrosive environments and is therefore widely used in various fields that require corrosion resistance.

2. Weather resistance: Its surface oxide film can withstand the influence of the natural environment for a long time, such as sunlight, rain, wind and frost, etc., without oxidation, corrosion and other phenomena. Therefore, anodized aluminum is a very suitable material for outdoor use. At the same time, it has high surface hardness and good scratch resistance, which can effectively protect the aluminum matrix from damage.

3. Color retention: Anodized aluminum is available in a variety of colors, which can be achieved by using organic and inorganic dyes during the anodizing process. These vibrant colors are permanently embedded in the oxide layer, ensuring excellent color retention.

4. Electrical insulation properties: The aluminum oxide in its surface oxide film is an insulating material that can effectively isolate the aluminum alloy from the external current. This electrical insulation property makes anodized aluminum widely used in electronics, electrical and other fields. For example, it can be used as the dielectric layer of capacitors in electronic devices to isolate current; it can be used as an insulating layer in electrical equipment. In addition, the surface oxide film of anodized aluminum also has a large resistance, so it plays a role in improving the electrical insulation of some products.

Common classifications of anodized aluminum:

1. Type I: This classification is chromic acid anodizing, which is generally thin and has poor corrosion resistance. Type I anodized aluminum can be used for decorative finishes, but has limited uses compared to other types.

2. Type II: Sulfuric acid anodizing belongs to this type and is the most commonly used process. It produces a thicker anodized layer and provides greater corrosion resistance and better dye retention. Type II anodizing is suitable for a wide range of applications including construction, consumer products and electrical enclosures.

3. Type III: Also known as hard-coat anodization, this classification produces a dense and thick oxide layer that significantly improves the hardness and wear resistance of the material. Type III anodizing is suitable for applications that are subject to severe wear and tear, such as automotive parts, tools, and industrial equipment.

 Anodized Aluminum1

The difference between anodized aluminum and aluminum:

The main difference between it and ordinary aluminum is the surface properties. While aluminum itself conducts electricity well, is lightweight, and is versatile, anodizing enhances these properties. In addition, the surface of anodized aluminum has a naturally occurring aluminum oxide film, which is extremely stable and is not prone to corrosion. The surface of ordinary aluminum has no corrosion resistance and is easily corroded by pollutants and other substances in the air.

Anodized aluminum is superior to ordinary aluminum in terms of surface quality, corrosion resistance, wear resistance, electrical conductivity, strength and hardness, and decorative properties, which also makes anodized aluminum highly versatile and suitable for a variety of professional applications.

The application of anodized aluminum:

In the construction field, it can be mainly used as indoor and outdoor building materials, such as facades, curtain walls, ceilings, partitions, handrails, etc. Its beautiful appearance and corrosion resistance make it an ideal choice in the construction field.

Medical device field: Its surface has a layer of naturally occurring aluminum oxide film. This film is dense, hard, wear-resistant and corrosion-resistant, so it can effectively protect the aluminum matrix from damage, thereby effectively increasing the service life of the device. , is widely used in the production of medical devices, such as surgical instruments, medical equipment, etc.

Electronics field: Due to its high purity and good electrical insulation properties, it has become a key material in the electronics industry and is often used to make integrated circuits, capacitors, resistors, semiconductors, etc.

 Anodized Aluminum2

Understanding anodized aluminum, its properties, common classifications, and how it differs from regular aluminum is critical to leveraging its advantages in various industries. So whether you’re considering anodized aluminum for construction, automotive, or other applications, its unique features make it a reliable and long-lasting material choice.

Quanshuo Metal Materials is a manufacturer that has passed ISO9001:2015, TUV, SGS, and CE certification. It mainly produces aluminum product, etc., with an annual output of 300,000 tons. Looking forward to your inquiry.

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