The Dual Pulse Electroplating Rectifier is a core device in the electroplating process that provides a stable DC power source, and its performance directly affects key quality indicators such as coating uniformity, adhesion, and gloss. Below is an introduction to its core functions, main types, and key parameters:
Provide Stable DC Power: It converts industrial AC power (220V/380V) into DC power suitable for electroplating, ensuring stable current and voltage output. This prevents issues such as burning, pinholes, and uneven thickness that can occur due to fluctuations in power supply.
Parameter Regulation: Depending on the type of coating (such as chrome, nickel, zinc) and process requirements, it adjusts the output current (or voltage), waveform, etc., to meet the specific needs of the electroplating process. For example, chrome plating requires high voltage and low current, while copper plating requires a higher current density.
Protection Function: It is equipped with safety mechanisms like overcurrent, overvoltage, and short-circuit protection, which prevent equipment damage or process failure due to abnormal electrolytic solutions (e.g., high concentration or poor electrode contact).
By Technology Principle:
Silicon Rectifier: The earlier mainstream equipment, low cost, and simple structure, but with lower output precision (±5%). The waveform is unidirectional pulsating DC, suitable for standard electroplating where coating quality is not highly critical (e.g., zinc plating of bolts).
Thyristor Rectifier (SCR): By adjusting output with thyristor components, the precision is improved to ±1%~±2%. It can achieve smooth voltage and current regulation, and the waveform can be optimized to approach pure DC. It is widely used in medium- to high-end electroplating like hardware, automotive parts, etc.
High-Frequency Switching Rectifier: Uses high-frequency conversion technology, compact size, high efficiency (over 90%), and extremely high output precision (±0.5%). It supports multiple waveforms (pure DC, pulse, reverse, etc.), making it ideal for precision electroplating (e.g., PCB boards, precious metal plating) and uniform coating on complex-shaped parts.
By Output Characteristics:
Constant Current Type: Maintains a stable output current, with the voltage adjusting automatically according to the load (such as changes in electrolyte resistance). Suitable for processes sensitive to current density (e.g., hard chrome plating).
Constant Voltage Type: Maintains a stable output voltage, with the current varying based on the load. Commonly used for electro-cleaning, activation, and other pre-treatment processes.
Constant Current & Voltage Integrated Type: Allows for mode switching based on process needs, providing greater flexibility and ideal for production lines with multiple process steps.
Output Range: Includes rated current (e.g., 50A, 500A, 1000A) and rated voltage (e.g., 12V, 30V, 100V). These need to be matched based on the surface area of the workpiece and electroplating time.
Regulation Precision: Refers to the control error of the current/voltage. High-precision equipment (e.g., ±0.1%) ensures coating consistency, which is especially important for batch production.
Waveform Quality: Pure DC waveforms are suitable for standard coatings, while pulsed waveforms (such as single pulse, dual pulse) are used to refine crystal grain size, improve coating hardness, and are commonly used in decorative chrome plating or alloy electroplating.
Protection Grade: For example, IP54 (dust and splash proof) is suitable for humid electroplating shop environments, preventing equipment damage from moisture or corrosive gases.
The dual-pulse electroplating rectifier is widely used in various electroplating processes, such as:
Hardware Industry: Zinc plating of fasteners, nuts, washers, small springs, etc.
Automotive Industry: Chrome plating of automotive parts.
Electronics Industry: Nickel plating of electronic components and connectors.
Precious Metal Plating: Gold and silver electroplating.
Additionally, it is suitable for electropolishing, anodizing, and other surface treatment applications requiring high control and precision.
