Overview of basic knowledge of pulse power supply
Pulse electroplating is an advanced electroplating technology. Based on traditional DC electroplating, it uses pulse current instead of continuous current, thus having significant advantages in coating quality, coating thickness control, energy saving and consumption reduction. This article will delve into the basic principles and processes of pulse plating, the advantages of pulse power supply, and related precautions.
2. Basic principles of pulse plating
Pulse electroplating is based on the principle of electrochemistry. By applying pulse current in the electrolyte, metal ions are reduced and deposited on the cathode to form a coating. Unlike traditional DC plating, the current of pulse plating changes intermittently or periodically. This periodic on-off process can improve the structure, hardness, porosity and other characteristics of the electroplated layer, thereby improving the quality of the electroplated layer.
3. Pulse plating process
1. The pulse power supply applies a periodically changing current to the electrolyte.
2. In each pulse cycle, the current changes between positive and negative directions, resulting in reduction and oxidation reactions of metal ions on the cathode.
3. Metal ions are reduced and deposited on the cathode to form a coating.
4. By controlling pulse parameters (such as pulse width, pulse frequency and pulse amplitude, etc.), the structure and performance of the coating can be accurately controlled.
4. Advantages of pulse power supply
1. Improve coating quality: By controlling pulse parameters, a coating with dense structure, high hardness and corrosion resistance can be obtained.
2. Reduce energy consumption: Since pulse plating uses periodic power on and off, it can effectively reduce waste of electrical energy and reduce energy consumption.
3. Improve coating thickness control accuracy: By accurately controlling pulse parameters, precise control of coating thickness can be achieved.
4. Reduce environmental pollution: Because pulse plating can effectively reduce energy consumption and raw material consumption, thereby reducing environmental pollution.
5. Pulse power supply type
1. Unidirectional pulse power supply: Provides periodic changes in positive and negative currents.
2. Bidirectional pulse power supply: only provides periodic changes in positive and negative currents.
3. DC superimposed pulse power supply: superimpose pulse current on the basis of DC current.
6. Pulse power supply waveform and parameter analysis
1. Pulse width: refers to the duration of each pulse.
2. Pulse frequency: refers to the number of pulses per unit time.
3. Pulse amplitude: refers to the peak current or voltage of each pulse.
Different waveforms (such as rectangular waves, triangular waves, bell-shaped waves, etc.) have different effects on the coating structure and performance. Selecting the appropriate waveform and parameters is the key to obtaining excellent coatings.
7. Precautions for pulse power supply
1. Select the appropriate pulse power type and waveform according to the coating requirements.
2. Precisely control pulse parameters to obtain ideal coating structure and performance.
3. Pay attention to the influence of electrolyte concentration and temperature on the pulse plating effect.
4. Regularly inspect and maintain pulse power supply equipment to ensure its normal operation.
5. Follow safety regulations during operation to avoid possible accidents such as electric shock.
As an advanced electroplating technology, pulse plating has significant advantages and application prospects. An in-depth understanding of its basic principles, processes and precautions will help to better apply this technology, improve coating quality, reduce energy consumption, achieve more precise thickness control, and contribute to the development of related fields.
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