Foil for electrolytic capacitors

1. Overview

Aluminum foil for electrolytic capacitors is a key material for manufacturing aluminum electrolytic capacitors, and its quality directly affects the performance and life of the capacitor. The aluminum foil is usually made of high-purity aluminum and processed through rolling, corrosion and chemical processing to improve its charge storage capacity and electrochemical stability. With the development of the electronics industry, the technical requirements for foil for electrolytic capacitors are also constantly improving to meet higher reliability and performance requirements.

2. What is foil for electrolytic capacitors?

Foil for electrolytic capacitors is an aluminum foil material specially used for aluminum electrolytic capacitor plates, which is mainly divided into corrosion foil and chemical foil.

- Corrosion foil: used for the anode plate of the capacitor, a porous structure is formed through special surface treatment to increase the specific surface area and increase the capacitance.

- Chemical foil: can be used for anode or cathode, and an oxide film is formed on the surface through electrochemical treatment to improve dielectric properties and withstand voltage.

 

3. Main features of foil for electrolytic capacitors

1. High-purity aluminum: using 1A97, 1A99, 1A85, 1A90, 1A93, 1A95, 1070A, 3003 and other high-purity aluminum alloys to ensure excellent conductivity and stability.

2. Higher specific capacity: through advanced corrosion and chemical formation processes, the charge storage capacity per unit area of ​​aluminum foil is improved.

3. Strict dimensional tolerance control: ensure product consistency and improve the reliability of capacitors.

4. Good mechanical properties: suitable for subsequent processing such as rolling, stamping, and winding.

 

4. Dimensional tolerance

 

| Item | Specification range | Deviation |

|------------|----------------|----------|

| Core inner diameter | 150mm, 152.4mm | ±1mm |

| | 75mm, 76.2mm | ±0.5mm |

| Width | 500~1000mm | ±1.0mm |

| | 200~500mm | ±0.5mm |

| Thickness | 0.05~0.15mm | ±3% |

| | 0.0015~0.05mm | ±5% |

 

5. Industry standards

Foil for electrolytic capacitors complies with the following national standards:

- GB/T 3190

- GB/T 3199

- GB/T 7999

- GB/T 8170

- GB/T 16865

- GB/T 17432

- GB/T 20975

- GB/T 22638.1

- GB/T 22638.8

6. Production process

The main production processes of foil for electrolytic capacitors include:

- Rolling: Processing aluminum ingots into thin foils through high-precision rolling mills to control thickness accuracy and surface quality.

- Corrosion: Surface treatment of anode aluminum foil to form a porous structure to increase specific surface area.

- Formation: Forming an oxide film on the surface of aluminum foil by electrochemical methods to improve dielectric properties.

 

7. Application fields

Foil for electrolytic capacitors is widely used in the following fields:

- Consumer electronics: smart phones, computers, TVs, power adapters, etc.

- Automotive electronics: new energy vehicle electronic control systems, car audio, power modules, etc.

- Industrial equipment: inverters, motor drives, power electronic equipment, etc.

- Communication equipment: base station power supplies, servers, telecommunications equipment, etc.

 

8. Why choose Chalco?

1. High-quality material supply: Use high-quality aluminum alloy to ensure product consistency and stability.

2. Advanced production process: Strictly control rolling, corrosion, and chemical formation processes to improve product performance.

3. Perfect quality management system: Meet national standards to ensure product reliability.

4. Stable supply capacity: Large production scale, short delivery cycle, meet customer needs.

 

9. Frequently Asked Questions

1. How to choose the appropriate specifications for foil for electrolytic capacitors?

It is necessary to select the appropriate thickness and width according to the voltage and capacity requirements of the capacitor and the manufacturing process requirements.

2. What are the storage conditions for foil for electrolytic capacitors?

It should be stored in a dry, cool, non-corrosive gas environment to avoid oxidation and contamination.

3. How does the quality of aluminum foil affect the performance of the capacitor?

The higher the purity and the more stable the electrochemical performance, the higher the life and reliability of the capacitor.

4. Do you provide customized specifications of aluminum foil?

Aluminum foil products with different thicknesses, widths and processing processes can be provided according to customer needs.