ELECTRICAL CONTACT BETWEEN
Posted: Mon Feb 17, 2025 8:25 am
The anode current density should be in the range of 1.6 - 4 Amperes per square decimeter. In such limits, a beautiful, colored and dense protective anode layer will grow. It is best to maintain a current density of 2 to 2.2 Amperes / dm2. With a lower current, the coating will grow slowly and not thick. With a current greater than 4 Amperes / dm2, an electrical breakdown may occur, and the product will quickly etch.
The cathode current density should be low. The chinese overseas australia data this value, the better, because it provides a uniform and soft mode of current density distribution over the surface of the workpiece, especially if it is large. Therefore, remember that the area of the lead cathode should be twice as large as the area of the workpiece (anode).
The process of anodizing an aluminum profile does not specify the value of the anode-cathode voltage. However, if your circuit has non-zero resistance, then you need a decent voltage of the power supply. Moreover, it is desirable that you use a power supply with several output voltages. And here is why.
The protective layer that grows on the product is a dielectric. As it grows, its electrical resistance constantly increases. In order to maintain the required current density, the current strength must be adjusted several times throughout the process using a variable resistor.
However, the voltage may not be enough when the anode layer becomes thick enough. In this case, you need to add voltage. Therefore, the power supply must provide at least two voltages at the output.
Anodizing bath
Before work, it is necessary to prepare the equipment for anodizing. Usually, several baths are required: for processing small parts, short and long items. They should be made of aluminum. Polyethylene is also a suitable option. As a small container, you can use a food container or a long plastic flower pot.
It is advisable to cover the bottom and walls of the plastic bath with aluminum sheets. You can cut a pattern out of an aluminum sheet and bend an improvised "container". The point of this is to ensure uniform current density on all sides of the product.
The cathode current density should be low. The chinese overseas australia data this value, the better, because it provides a uniform and soft mode of current density distribution over the surface of the workpiece, especially if it is large. Therefore, remember that the area of the lead cathode should be twice as large as the area of the workpiece (anode).
The process of anodizing an aluminum profile does not specify the value of the anode-cathode voltage. However, if your circuit has non-zero resistance, then you need a decent voltage of the power supply. Moreover, it is desirable that you use a power supply with several output voltages. And here is why.
The protective layer that grows on the product is a dielectric. As it grows, its electrical resistance constantly increases. In order to maintain the required current density, the current strength must be adjusted several times throughout the process using a variable resistor.
However, the voltage may not be enough when the anode layer becomes thick enough. In this case, you need to add voltage. Therefore, the power supply must provide at least two voltages at the output.
Anodizing bath
Before work, it is necessary to prepare the equipment for anodizing. Usually, several baths are required: for processing small parts, short and long items. They should be made of aluminum. Polyethylene is also a suitable option. As a small container, you can use a food container or a long plastic flower pot.
It is advisable to cover the bottom and walls of the plastic bath with aluminum sheets. You can cut a pattern out of an aluminum sheet and bend an improvised "container". The point of this is to ensure uniform current density on all sides of the product.