There are generally two common surface treatment methods used for deformation joint devices by manufacturers. These include anodizing and spraying. Each method offers unique benefits and is chosen based on the specific requirements of the project.
1. **Anodizing Treatment**
Anodizing is an electrochemical process that creates a protective oxide layer on aluminum and its alloys. During this process, the aluminum part is placed as the anode in an electrolytic solution. When an electric current is applied, oxygen from the electrolyte reacts with the aluminum surface to form an aluminum oxide film. This film is known as an anodized coating or an electrochemical conversion layer.
Unlike naturally formed oxide layers, the anodized film has a unique cellular structure. It consists of hexagonal cylindrical cells with rounded tops and a star-shaped cross-section. The oxide layer has two distinct parts: the inner, dense barrier layer and the outer porous layer. The barrier layer is thin (0.01–0.05 μm) and composed mainly of pure Al₂O₃, which gives it high hardness. The outer porous layer contains aluminum oxide with water molecules, making it softer and more suitable for coloring or further treatments.
Additionally, aluminum surfaces can be electroplated before anodizing. For example, copper plating followed by hard chrome plating increases wear resistance, while decorative chrome plating improves appearance. Anodizing can also be colored using various dyes, offering both functional and aesthetic advantages.
2. **Deformation Joint Spraying**
Spraying is another popular surface treatment method, especially when matching the color of the surrounding walls or structures is important. This technique allows the aluminum surface to be coated with paint or powder coatings in a wide range of colors, creating a uniform and visually appealing finish.
The sprayed coating is not only aesthetically pleasing but also durable, making it ideal for both indoor and outdoor applications. However, compared to anodizing, spray coating tends to be more expensive due to the materials and labor involved. It’s often preferred in projects where visual harmony is a priority, even though it may require more maintenance over time.
In summary, both anodizing and spraying offer effective ways to enhance the performance and appearance of deformation joint devices. The choice between them depends on factors such as cost, durability, aesthetics, and environmental conditions.
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