Oxidation processing of aluminum alloy is a common surface treatment process. By forming a dense oxide film on the surface of aluminum alloy, the corrosion resistance and wear resistance of the material can be effectively improved. In order to ensure the quality of aluminum alloy oxidation processing, the following are several key quality control methods:
1. Strictly control oxidation process parameters
In the process of aluminum alloy oxidation processing, the choice of process parameters is very important. It mainly includes the concentration, temperature, current density and processing time of the electrolyte. These parameters directly affect the thickness, density and uniformity of the oxide film.
Electrolyte concentration: According to different product needs, choose the appropriate concentration of electrolyte to ensure the quality of oxide film.
Temperature control: Maintain a constant electrolyte temperature to avoid excessive temperature resulting in loose oxide film, or too low temperature resulting in slow oxidation rate.
Current density: Reasonable control of current density to ensure uniformity and thickness of oxide film. Too high current density may cause local burn of oxide film, too low current density will affect the oxidation efficiency.
Treatment time: Depending on the required oxide film thickness, determine the appropriate treatment time. Too short time will lead to insufficient thickness of the oxide film, and too long time may cause excessive growth of the film and affect the binding force.
2. Seal holes
The sealing treatment of aluminum alloy after oxidation is an important step to ensure the quality of oxide film. The sealing treatment can effectively prevent the oxide film from being corroded and polluted during use.
Hot water sealing: Water and impurities in the oxide film can be discharged through hot water sealing, improving the density and corrosion resistance of the film layer.
Steam sealing: Steam sealing can form a dense protective layer on the surface of the oxide film to further improve oxidation resistance and corrosion resistance.
Chemical sealing: The use of chemical reagents for sealing treatment can form a chemically stable protective layer on the surface of the oxide film, enhancing the weather resistance and corrosion resistance of the film.
3. Quality inspection
In each step of aluminum alloy oxidation processing, strict quality testing is required to ensure the quality of the final product.
Film thickness detection: Use a professional film thickness measuring instrument to detect whether the thickness of the oxide film meets the requirements.
Hardness testing: Through hardness testing, the wear resistance and hardness of the oxide film are assessed to ensure that it meets the requirements of use.
Corrosion resistance test: Salt spray test or other corrosion resistance test is performed to evaluate the corrosion resistance of the oxide film.
Appearance inspection: Check whether the surface of the oxide film has cracks, bubbles, color differences and other defects to ensure its appearance quality.
4. Reasonable processing sequence
In the order of aluminum alloy oxidation processing and mechanical processing, it is necessary to make reasonable arrangements according to the specific situation.
First machining after oxidation: For some precision parts, it can be machined first and then oxidized, which can ensure the dimensional accuracy and surface quality of the parts. However, it should be noted that damage to the oxide film should be avoided during machining.
First oxidation and then machining: For some parts that require special surface treatment, oxidation treatment can be carried out first, and then the necessary machining. At this time, the damage to the oxide film should be minimized to ensure its integrity and quality.
5. Environmental control
The cleanliness and temperature and humidity of the processing environment also have an important impact on the quality of aluminum alloy oxidation processing.
Cleanliness: Keep the processing environment clean to avoid dust and pollutants on the oxide film pollution.
Temperature and humidity: Control the temperature and humidity of the processing environment to avoid excessive humidity resulting in moisture absorption of the oxide film, or excessive temperature resulting in aging of the oxide film.
6. Raw material quality control
High quality raw materials are the basis to ensure the quality of aluminum alloy oxidation processing. Select high-quality aluminum alloy materials, and carry out strict inspection to ensure that its composition and performance meet the requirements.
7. Operator training
The professional skills and responsibility of the operator also have an important impact on the quality of aluminum alloy oxidation processing. Regular training of operators to improve their operational skills and quality awareness, to ensure that each process can be carried out in strict accordance with the process requirements.
Through the above method, the quality of aluminum alloy oxidation processing can be effectively controlled to ensure the quality and performance of the final product. In the actual production process, it is also necessary to continuously optimize and improve the process flow according to the specific situation to improve production efficiency and product quality.