Sprocket surface treatment is a crucial step in improving the surface quality and properties of the material. There are various types of treatments available that can be used for this purpose. These include blackening treatment which involves surface oxidation, solid lubrication treatment, galvanizing, phosphating treatment, chemical silver plating and RAYDENT surface treatment. Each of these treatments has its unique features that help enhance the sprocket's surface state.
For instance, blackening treatment or surface oxidation is mainly used to increase the hardness and resilience of the sprocket's surface. Solid lubrication treatment involves coating the sprocket with a layer of solid lubricant to improve its wear and corrosion resistance. Galvanizing treatment entails applying a layer of zinc or other metal alloy coating to protect the sprocket from corrosion and other forms of damage.
The phosphating treatment also aims to enhance the sprocket's corrosion resistance properties by adding a layer of iron or zinc phosphate on its surface. Chemical silver plating, on the other hand, is used to improve the sprocket's electrical conductivity and corrosion resistance properties. Finally, RAYDENT surface treatment involves high-precision laser beam processing that improves the surface smoothness and accuracy of the sprocket.
In summary, the surface treatment of a sprocket plays a critical role in improving its service life, performance and reliability. The choice of treatment depends on the specific application requirements, environmental conditions, and other factors that may affect the sprocket's surface properties.
1. Blackening treatment (surface oxidation):
An effective method for alkaline blackening treatment involves immersing the metal in an alkaline solution, followed by heating it to 14CTC. During this process, a chemical reaction occurs on the metal's surface, resulting in the formation of a black film. This film is characterized by its thin thickness and ferric oxide composition, which provides excellent corrosion resistance. Ultimately, the alkaline blackening treatment protects the metal from rusting and enhances its durability significantly.
2. Solid lubrication treatment:
To apply the solid lubricant, simply spray it onto the tooth surface of the wheel. As the lubricant adheres to the surface, it dries and forms a film. This film contains aluminum disulfide particles that have the ability to penetrate the metal structure and provide lubrication. It is especially useful during the initial run-in of the wheel or to prevent fretting corrosion caused by small frictional actions. This lubricant is typically used in situations where traditional lubricating grease cannot be applied.
3. Galvanizing:
Metals are often subjected to surface treatment in order to enhance their resistance against rusting. The latest advances in salt passivation treatment have led to improved appearance characteristics as well. The thickness of the coating can differ, but is typically around 225 μm.
4. Phosphating treatment:
To provide protection against rust and wear, it is recommended to subject the metal to a chemical treatment known as phosphate treatment. This process involves immersing the metal in a heated phosphate solution. The resulting phosphate film is highly effective, offering both rust resistance and lubrication properties, which makes it ideal for treating sliding parts in particular. One effective option for phosphate treatment is the use of PARUHOSU M, an ethium-based phosphating treatment fluid. This treatment has been shown to produce a film thickness of around 315 μm, which is highly protective and durable. By choosing phosphate treatment, you can help ensure the longevity and performance of your metal components.
5. Electroless silver plating:
Electroless plating is known for its excellent resistance to corrosion and wear, making it an ideal choice for various applications. Interestingly, this plating technique does not require any electricity or involve electrolysis when silver plating is performed. This feature makes it a preferred choice for products with intricate shapes and high dimensional accuracy. Moreover, the coating thickness achieved through electroless plating remains consistent, typically ranging from 3 to 10μm.
6. RAYDENT surface treatment:
RAYDENT technology involves using an electroplating-like process to create a black oxide film on the surface of the material. This film is extremely durable, measuring 1-2 μm in thickness, and it secures itself firmly to the metal. As a result, the material becomes highly resistant to rust and wear and displays an elegant black finish.
Note:
The uniform formation of the film on the root of the tooth or inside the hole may be impacted by its shape and size.
It is necessary to clearly indicate that the elimination of hexavalent chromium is mandatory when complying with RoHS regulations. Please ensure that this requirement is explicitly stated.