The air compressor in the electroplating workshop is the core auxiliary equipment, mainly through the provision stable, clean compressed air it drives multiple key links in the electroplating process while ensuring process accuracy and production safety. The following is a detailed description of its specific role and technical requirements:
the core role of air compressor in 1. electroplating workshop
- pneumatic equipment drive
- automatic control compressed air drives the cylinder, solenoid valve and other executive components to realize automatic operation such as automatic addition of plating bath solution, loading and unloading of workpieces, and control of coating thickness.
- Sand blasting/shot peening before electroplating, the compressed air-driven sandblasting machine cleans the oxide layer or oil stain on the surface of the workpiece to improve the adhesion of the coating.
- Stirring and Filtration: The pneumatic stirrer is used to prevent the plating solution from settling, or the filter is driven to remove impurities to maintain the stability of the plating solution.
- Process gas supply
- special electroplating process for example, copper cyanide plating, hard chromium plating, etc., compressed air shall be introduced to stir the plating solution to ensure uniform composition; for some processes (such as electroless nickel plating), compressed air shall be used to remove hydrogen to prevent embrittlement of the coating.
- Exhaust gas treatment the waste gas (such as acid mist and chromium acid mist) produced by electroplating shall be discharged into the purification system through the induced draft fan driven by compressed air, which meets the requirements of environmental protection.
- Cleaning and drying
- blow-dry workpiece after electroplating, use compressed air to dry the surface moisture of the workpiece to prevent water stains from affecting the quality of the coating.
- Equipment cleaning regularly use compressed air to clean the plating tank, hanger and other equipment to avoid corrosion of equipment by residual plating solution.
Special Requirements for Air Compressor in 2. Electroplating Workshop
- high air cleanliness requirements
- oil pollution risk: The oil discharged from the traditional oil air compressor may adhere to the surface of the workpiece, causing the coating to blister, fall off or pinholes, which seriously affects the product quality.
- Solution: must be selected oil-free air compressor(Dry or water lubrication type), ensure that the exhaust oil content is ≤ 0.01 mg/m & sup3;(ISO 8573-1 Class 0 standard) to avoid oil pollution.
- Pressure and Flow Stability
- process sensitivity: Constant pressure (usually 0.6-0.8MPa) is required for stirring and sandblasting of electroplating bath solution. Pressure fluctuation may lead to uneven coating thickness or equipment failure.
- Solution: Configure gas storage tank and pressure regulating valve to stabilize the output pressure; Select variable frequency air compressor to dynamically adjust the power according to the gas consumption, saving energy and reducing pressure fluctuation.
- Corrosion-resistant and explosion-proof design
- environmental Corrosivity: There is acid and alkali mist in the electroplating workshop, and the air compressor shall be coated with anti-corrosion coating (such as epoxy resin) and stainless steel pipes to prevent corrosion of parts.
- Explosion-proof requirements: If there is flammable gas (such as hydrogen) in the workshop, explosion-proof air compressor shall be selected, which meets ATEX or IECEx certification standards.
- Low noise and energy saving
- noise control the electroplating workshop is usually a closed environment, and the noise of the air compressor should be ≤ 75dB(A) to avoid affecting the health of workers.
- Energy saving demand: Under long-term operation, energy consumption accounts for a high proportion of production costs, and water-lubricated oil-free air compressors (energy saving 15%-20%) or frequency conversion models are preferred.
Suggestions on Selection of Air Compressor in 3. Electroplating Workshop
| type of Technology | applicable Scenarios | advantage | precautions |
|---|
| water-lubricated oil-free air compressor | general plating (e. g. galvanized hardware, chrome plating of automotive parts) | approximate oil-free (exhaust contains trace water vapor, easy to remove); energy saving 15%-20%; low maintenance cost. | Need to be equipped with drying equipment; water quality needs to be monitored (to prevent scaling), suitable for both cost and cleanliness of the scene. |
4. typical application cases
case 1:PCB Plating Line
A water-lubricated single-screw air compressor is selected to provide Class 0 compressed air and drive a pneumatic pump that automatically adds copper plating solution to ensure that the uniformity of the coating thickness is ≤ ± 5% and the product qualification rate is increased to 99.5.
Case 2: Car wheel chrome plating workshop
A water-lubricated single-screw air compressor is used. After the exhaust is treated by a cold dryer, the dew point is less than or equal to -40 ℃. The sandblasting machine is driven to clean the surface of the hub, and the chromium plating solution is stirred at the same time. The energy saving is 20% and there is no risk of oil pollution.
5. Summary
the air compressor in the electroplating workshop is the key guarantee for the stability of the process and should be selected according to the following principles:
- cleanliness priority: Oil-free model (water lubrication) is required;
- balance between stability and energy saving: Frequency conversion technology + gas tank can take into account pressure stability and energy consumption;
- environmental Adaptability anti-corrosion, explosion-proof design to extend equipment life;
- cost control: Water-lubricated models are more cost-effective in general electroplating scenarios.
Correct selection can significantly improve the quality of the coating, reduce the scrap rate, while reducing equipment maintenance costs and environmental risks.
