There are two common surface treatment methods used for deformation joint devices, typically applied by manufacturers in the industry: anodizing and spraying. Each method offers unique advantages and is chosen based on the specific needs of the project.
1. **Anodizing Treatment**
Anodizing is an electrochemical process that creates a protective oxide layer on the surface of aluminum or its alloys. During this process, the aluminum component is placed on the anode in an electrolyte solution, and an electric current is passed through it. This causes the formation of an oxide film on the surface, which is known as an anodized layer or an electrochemical conversion coating.
The resulting oxide film differs significantly from the naturally occurring oxide layer. It has a unique cellular structure, with each cell resembling a hexagonal cylinder, featuring a rounded top and a star-shaped cross-section. The film consists of two distinct layers. The inner layer, closest to the base metal, is a dense and thin layer of pure aluminum oxide (Al₂O₃), with a thickness ranging from 0.01 to 0.05 micrometers. This layer is hard and acts as a barrier, providing excellent corrosion resistance. The outer layer is porous, composed of aluminum oxide with water molecules incorporated into its structure, making it softer and more suitable for coloring.
In addition to anodizing, aluminum surfaces can also be electroplated. For instance, copper is often plated first, followed by a layer of hard chrome for enhanced durability. Decorative chrome plating is another option for aesthetic purposes. Anodizing can also be colored using various techniques, offering a wide range of design possibilities.
2. **Deformation Joint Spraying**
Spraying is another popular surface treatment method, especially when matching the color of the surrounding wall or structure is important. The aluminum surface can be painted to match the desired color, creating a visually appealing and durable finish. This method is particularly useful in architectural applications where aesthetics play a key role.
While spraying provides a smooth and attractive appearance, it is generally more expensive than anodizing. However, it allows for greater flexibility in color choices and can be tailored to meet specific design requirements. Additionally, the sprayed coating offers good adhesion and protection against environmental factors.
In summary, both anodizing and spraying have their own benefits. Anodizing is cost-effective, durable, and provides a natural metallic look, while spraying offers more color options and a polished finish. Choosing between the two depends on the project's functional and aesthetic demands.
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