Anodizing power supply is a high-precision DC power supply system designed specifically for the electrochemical oxidation process of metal surfaces. Its technical requirements vary depending on the material, process type, and industry standards. Based on current industry practices and mainstream equipment parameters, the core requirements can be systematically summarized as follows:

1、 Basic electrical parameter requirements

|Parameter category | Ordinary decorative oxidation | Hard anodizing | Micro arc oxidation | General requirements|

|Output voltage | 15-24 V | 60-120 V | 300-600 V | 0-1000 V (customizable)|

|Output current | 10-500 A | 500-10000 A | 100-5000 A | 10-30000 A (wide range adjustable)|

|Current density | 1-2 A/dm 2 | 2-3 A/dm 2 | 3-5 A/dm 2 | Match based on material and electrolyte|

|Ripple factor | ≤ 5% RMS | ≤ 2% RMS | ≤ 1% RMS | ≤ 2% (high-end equipment)|

|Output waveform | Flat wave/DC | Square wave/pulse | High frequency pulse (>1kHz) | Square wave, double pulse, sine wave optional|

|Operating frequency | 50-60 Hz | 20-30 kHz | 1-10 kHz | 20-50 kHz (mainstream high-frequency switching power supply)|

Note: The lower the ripple coefficient, the higher the density of the oxide film, and the better the sealing quality; Square wave output can suppress film dissolution, improve hardness and corrosion resistance.

2、 Technical differences in material adaptability

Aluminum and aluminum alloys:

Ordinary oxidation uses sulfuric acid electrolyte, voltage 15-24V, current density 1-2A/dm 2;

Hard oxidation requires high voltage (80-120V), low temperature (0-5 ℃), and high current, and the power supply needs to have fast constant current switching and temperature compensation functions.

Titanium alloy:

Commonly used in micro arc oxidation, high voltage stability (± 1%) is required, and the electrolyte is mostly alkaline or phosphate system;

The power supply must support pulse frequency regulation and voltage slope control to prevent uneven breakdown.

Magnesium alloy:

Voltage range 10-30V, current density 1-5A/dm 2;

The electrolyte is mostly a fluorine-containing alkaline system (such as HAE method) or an acidic DOW17 system, and the power supply needs to have a corrosion-resistant shell and low-noise output.

3、 Requirements for control and protection functions

Control mode:

Must support automatic switching between constant current (CC)/constant voltage (CV) to achieve dynamic adjustment of the film growth stage;

High end equipment integrates multi-stage process programming (such as soft start, step pressurization, timed shutdown).

Accuracy index:

Voltage stabilization accuracy: ≤± 0.5% FS;

Current stabilization accuracy: ≤± 0.5% FS;

Temperature drift and time drift: ≤ 1% rated value (24-hour continuous operation).

Protection mechanism:

Must have seven layers of protection: overvoltage, overcurrent, short circuit, overheating, phase loss, undervoltage, and abnormal water pressure;

Support automatic reset and sound and light alarm to ensure continuous production safety.

4、 System level technical features

Topology structure:

Adopting IGBT full bridge inverter+synchronous rectification technology, efficiency ≥ 92% (traditional thyristor power supply only 75-85%);

The main transformer uses nanocrystalline soft magnetic alloy material to reduce high-frequency losses, with a volume only 1/5-1/10 of traditional equipment.

Cooling method:

Low power (<10kW): air-cooled;

High power (>50kW): water-cooled or oil immersed water-cooled, temperature rise ≤ 15 ℃ (full load).

Communication and Intelligence:

Supports industrial interfaces such as RS485, Modbus, 4-20mA, 0-10V, etc;

Can be connected to PLC or MES systems to achieve cloud storage, remote monitoring, and automatic parameter tuning of process parameters.

5、 Industry standards and certifications

Chinese standards:

The GB/T 8013 series (such as GB/T 8013.1-2007) specifies the performance of oxide films and indirectly requires stable power output;

There is no mandatory standard for direct power supply parameters, but GB 20943-2025 requires power efficiency (≥ 90%) and standby power consumption (≤ 0.3W).

International certification:

CE and ISO9001 are basic factory certifications;

ISO 2376:2019 specifies the method for testing the breakdown voltage of anodic oxide films, requiring the power output waveform to be pure and free of harmonic interference.

6、 Future Trends and Selection Suggestions

Trend:

Intelligence: AI algorithms dynamically optimize voltage current curves to adapt to different alloy compositions;

Modularization: N+1 redundancy design, supporting online expansion;

Greening: Non electrolytic capacitor design, lifespan increased by more than 3 times.

Suggestions for manufacturing industry selection in Linyi, Shandong:

Aluminum profile enterprises: prioritize the selection of 20-30 kHz high-frequency switching power supply, voltage 0-120V, current 500-5000A, supporting square wave output;

Aerospace support: Select micro arc oxidation power supply (300-600V, pulse frequency>5kHz), ripple<1%, with PLC interface;

Small and medium batch production: Modular digital power supplies (such as Bomei and OSM) are recommended, which support one click calling of process parameters and reduce operational barriers.

The anodizing power supply has evolved from a "simple rectifier" to a process control core, and its performance directly determines the hardness, density, corrosion resistance, and appearance consistency of the oxide film. When selecting, material characteristics should be taken as the guideline, process requirements as the goal, and intelligent control as the wing, in order to achieve efficient, stable, and compliant surface treatment.