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How to control the film thickness in the bending oxidation process
Category：answer Publishing time：2025-10-29 01:57:34 Browse： Times
Bending oxidation is a common metal surface treatment process, mainly used to improve the corrosion resistance, wear resistance and decorative properties of materials. In the oxidation process, especially during the anodic oxidation process, the thickness of the oxide film is one of the important indicators to measure product quality. Therefore, how to effectively control the thickness of the oxide film has become a problem that metal sheet processing enterprises must pay attention to.
1. Influence of Anodizing Film Thickness on Performance
The thickness of the anodizing film directly affects the service performance of the sheet metal parts. Generally, a thin film layer leads to a decrease in corrosion resistance and wear resistance, affecting service life; while a thick film layer may cause cracking, peeling off, and other problems, affecting appearance and function. Therefore, precise control of the film thickness is crucial for ensuring product quality in the anodizing process.
Two, Main Factors Affecting the Thickness of the Anodizing Film
1. Electrolyte Composition and Concentration
The type and concentration of the electrolyte directly affect the speed of the anodizing reaction and the quality of the film formation. Common electrolytes include sulfuric acid, oxalic acid, chromic acid, etc. Under different electrolyte systems, the structure and thickness of the anodizing film formed are also different. For example, sulfuric acid anodizing is suitable for obtaining medium thickness, porous anodizing films; while oxalic acid anodizing films are denser and thicker.
2. Current Density
Current density is a key parameter that determines the growth rate of the anodizing film. Within a certain range, as the current density increases, the formation rate of the anodizing film accelerates, and the film thickness also increases. However, an excessively high current density may cause local overheating or film burning, affecting uniformity. Therefore, it is necessary to set the current density reasonably according to the material type and process requirements.
3. Anodizing Time
Extending the anodizing time helps to increase the film thickness, but after a certain period of time, the film growth tends to reach saturation. Excessive anodizing time not only wastes energy but may also cause the film to become loose or cracked. Therefore, it is necessary to control the anodizing time reasonably according to the process specifications.
4. Temperature Control
Excessive electrolyte temperature accelerates the dissolution of the anodizing film, leading to a reduction in film thickness; on the other hand, too low temperature may slow down the reaction rate, affecting production efficiency. Typically, the electrolyte temperature during anodic oxidation should be controlled between 18~22°C, and a cooling system should be equipped to maintain constant temperature.
5. Base Material
Different aluminum alloy compositions have a significant impact on the formation speed and thickness of the anodizing film. Alloys containing more elements such as copper and silicon are not easy to form uniform and dense anodizing films and require adjustments to the electrolyte formula and process parameters to optimize the film thickness.
Three, Film Thickness Detection and Process Optimization
To ensure that the film thickness meets the standard requirements, it is necessary to use a thickness gauge for regular detection. Common thickness measurement methods include eddy current thickness measurement, micro-cutting method, etc. By monitoring the changes in film thickness in real time, it is possible to adjust parameters such as voltage, current density, and electrolyte concentration in a timely manner, thereby effectively controlling the film thickness.
In addition, enterprises can continuously optimize parameter combinations through process tests, establish standardized operation procedures, and improve the consistency and stability of product quality.
Four, Conclusion
The control of the thickness of the anodizing film is a systematic project, involving multiple links such as electrolyte configuration, current parameter setting, and temperature regulation. Only through scientific management and refined operations can the precise control of the film thickness be achieved, thereby improving the surface quality and performance of sheet metal products. In the future, with the development of intelligent manufacturing and automation technology, the control of the film thickness in the anodizing process will be more accurate and efficient, bringing a broader development space for the sheet metal industry.
Bending oxidation is a common metal surface treatment process, mainly used to improve the corrosion resistance, wear resistance and decorative properties of materials. In the oxidation process, especially during the anodic oxidation process, the thickness of the oxide film is one of the important indicators to measure product quality. Therefore, how to effectively control the thickness of the oxide film has become a problem that metal sheet processing enterprises must pay attention to.
1. Influence of Anodizing Film Thickness on Performance
The thickness of the anodizing film directly affects the service performance of the sheet metal parts. Generally, a thin film layer leads to a decrease in corrosion resistance and wear resistance, affecting service life; while a thick film layer may cause cracking, peeling off, and other problems, affecting appearance and function. Therefore, precise control of the film thickness is crucial for ensuring product quality in the anodizing process.
Two, Main Factors Affecting the Thickness of the Anodizing Film
1. Electrolyte Composition and Concentration
The type and concentration of the electrolyte directly affect the speed of the anodizing reaction and the quality of the film formation. Common electrolytes include sulfuric acid, oxalic acid, chromic acid, etc. Under different electrolyte systems, the structure and thickness of the anodizing film formed are also different. For example, sulfuric acid anodizing is suitable for obtaining medium thickness, porous anodizing films; while oxalic acid anodizing films are denser and thicker.
2. Current Density
Current density is a key parameter that determines the growth rate of the anodizing film. Within a certain range, as the current density increases, the formation rate of the anodizing film accelerates, and the film thickness also increases. However, an excessively high current density may cause local overheating or film burning, affecting uniformity. Therefore, it is necessary to set the current density reasonably according to the material type and process requirements.
3. Anodizing Time
Extending the anodizing time helps to increase the film thickness, but after a certain period of time, the film growth tends to reach saturation. Excessive anodizing time not only wastes energy but may also cause the film to become loose or cracked. Therefore, it is necessary to control the anodizing time reasonably according to the process specifications.
4. Temperature Control
Excessive electrolyte temperature accelerates the dissolution of the anodizing film, leading to a reduction in film thickness; on the other hand, too low temperature may slow down the reaction rate, affecting production efficiency. Typically, the electrolyte temperature during anodic oxidation should be controlled between 18~22°C, and a cooling system should be equipped to maintain constant temperature.
5. Base Material
Different aluminum alloy compositions have a significant impact on the formation speed and thickness of the anodizing film. Alloys containing more elements such as copper and silicon are not easy to form uniform and dense anodizing films and require adjustments to the electrolyte formula and process parameters to optimize the film thickness.
Three, Film Thickness Detection and Process Optimization
To ensure that the film thickness meets the standard requirements, it is necessary to use a thickness gauge for regular detection. Common thickness measurement methods include eddy current thickness measurement, micro-cutting method, etc. By monitoring the changes in film thickness in real time, it is possible to adjust parameters such as voltage, current density, and electrolyte concentration in a timely manner, thereby effectively controlling the film thickness.
In addition, enterprises can continuously optimize parameter combinations through process tests, establish standardized operation procedures, and improve the consistency and stability of product quality.
Four, Conclusion
The control of the thickness of the anodizing film is a systematic project, involving multiple links such as electrolyte configuration, current parameter setting, and temperature regulation. Only through scientific management and refined operations can the precise control of the film thickness be achieved, thereby improving the surface quality and performance of sheet metal products. In the future, with the development of intelligent manufacturing and automation technology, the control of the film thickness in the anodizing process will be more accurate and efficient, bringing a broader development space for the sheet metal industry.
