[China Aluminum Network] 1. Design and manufacture of fixtures
1.1 Characteristics of the fixture: The fixture used for anodizing is very different from the one used for electroplating. If an electroplating fixture with a similar hook is used as an anodizing fixture, it is not suitable because the fixture and the workpiece surface will be very anodized. Oxidation film is quickly generated. During the process, slight loosening of the fixture and the workpiece will change the position of the contact and impede the flow of current. Therefore, the workpiece must be clamped with a flexible clamp. Only in this way can the anodizing process proceed normally.
1.2 The structure of the fixture: The fixture structure is individual type. If the assembly is used, the riveted or welded area will loosen due to corrosion after several times of use, which will hinder the normal circulation of the current in the anodizing process. At the same time, the fixture should have a certain cross-sectional area. The fixture with a certain cross section also has sufficient elastic force and clamping force, so that the workpiece and the fixture maintain good contact, so as to ensure the normal current circulation when the workpiece is anodized. Avoid burning the workpiece due to bad heat.
1.3 Selection of fixture materials: The fixture is made of hard aluminum, and the hard aluminum material has good elasticity and is durable.
2. Workpiece clamping
2.1 Cleaning the fixture to remove the film: The fixture will also produce an oxide film during the anodizing process. For this reason, be sure to remove the oxide film before using it again before using it again. The film can be removed in aluminum degreasing solution. It is also possible to remove the oxide film at the contact area between the jig and the workpiece with a trowel. This method can also extend the service life of the jig for certain jigs.
2.2 The choice of clamping position: The position of the clamping workpiece should be selected properly. Generally, it should be clamped on the secondary side of the workpiece (that is, the non-decorative part). Otherwise, the contact area between the workpiece and the fixture cannot be covered with the oxide film due to being covered by the fixture. Of course, it will not be able to be dyed. This will show obvious white spots and affect the appearance quality. In addition, the question of whether the recessed parts suspended in the solution after the workpiece is clamped in the solution, such as the generation of gas, should also be considered.
2.3 to prevent the workpiece clamping deformation: The fixture is not the same, clips have a certain degree of flexibility. In particular, care must be taken when clamping a deformed workpiece, and excessive deformation of the workpiece should be avoided.
2.4 To prevent excessive clamping: When the workpiece is clamped too loose, the current between the fixture and the workpiece will be broken. In this case, the workpiece is likely to be burned.
2.5 Anodized parts to be dyed one by one: Some units apply anodization to some small parts using screens or other methods of bandaging. Although this method can save man-hours and increase efficiency under certain circumstances, it can only be used for certain anodizations with low quality requirements. Even if a small number of workpieces cannot form an oxide film at the mutual mask, it is not easily identified. But for workpieces that require black dyeing, this method of clamping is obviously not desirable. Must be clamped one by one to ensure the quality of anodizing.
3. Control of anodizing process conditions
3.1 The relationship between the temperature and the voltage of the solution: The lower the temperature of the solution in the rated range, the higher the required voltage, because the temperature of the oxide film is slower when the temperature of the solution is lower, and the film layer is denser to obtain a certain thickness. The oxide film requires an elevated voltage during the anodization process. When the temperature of the solution is high, the dissolution rate of the oxide film increases, and the resulting oxide film is loose. At this time, reducing the voltage can properly improve the quality of the oxide film.
3.2 The relationship between the temperature and time of the anodizing solution: The lower the solution temperature, the longer the anodizing time required. Because the solution temperature is low, the oxide film is slowly formed. As the temperature of the solution increases, the rate of oxide film formation increases. At this time to shorten the anodizing time, otherwise due to the increase of the outer layer of the oxide film resistance film layer dissolved, the size of the workpiece changes, the phenomenon of rough surface film.
The above measures are only emergency measures taken under the condition that there is no cooling device and no heating device.
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