Product Description
The electrophoretic coating process is extensively utilized in the
automotive industry due to its numerous advantages, such as high
paint utilization, low environmental pollution, automated
production, enhanced safety, and excellent rust, impact, and
corrosion resistance. This process is particularly beneficial for
coating complex-shaped auto parts, including those with intricate
edges, angles, holes, and cavities. It ensures uniform coverage
even in hard-to-reach areas, such as the inner cavities and
crevices of car frames, chassis, and other structural components.
This results in a high-quality, consistent finish and significantly
improves the anti-corrosion properties of the workpieces. To
achieve these outcomes, advanced technology, extensive experience,
efficient service, and a safe, stable production system are
essential.
Application Fields of Electrophoretic Coating Production Lines
Electrophoretic coating production lines are widely employed in
various industries, including:
- Automotive: Traditional and new energy vehicles
- Transportation: Motorcycles, rail transportation, and aerospace
- Industrial Machinery: Agricultural machinery, engineering machinery, and structural
parts
- Consumer Goods: Household appliances, daily hardware, and 3C electronics
- Specialized Industries: Shipbuilding, military, wind power, and sheet metal parts
This technology is particularly valued for its ability to provide
uniform and durable surface treatment across diverse applications.
Features of Jingtu Electrophoretic Coating Lines
With years of expertise, our company has developed electrophoretic
coating lines with the following standout features:
- Modular Design: The equipment is designed, produced, and installed in modular
units, ensuring a visually appealing structure, reliable
performance, and a significantly shortened construction cycle.
- Advanced Filtration Technology: A combination of rotary liquid separators, magnetic filters, and
paper belt filters effectively purifies the tank liquid, enhancing
the overall cleaning efficiency.
- Multi-Stage Oil Removal System: Our proprietary oil-water separator technology delivers
exceptional oil removal performance.
- Eco-Friendly Process: By integrating EDRO technology and a counter-current water
replenishment process, our system achieves zero discharge,
minimizing environmental impact.
Electrophoretic Coating Process
The workflow of electrophoretic coating equipment is as follows:
- Pre-Cleaning: Removal of surface contaminants.
- Loading: Placement of workpieces onto the production line.
- Degreasing: Elimination of oils and greases.
- Washing: Rinsing off residual degreasing agents.
- Rust Removal: Elimination of surface rust.
- Neutralization: Adjustment of surface pH levels.
- Phosphating: Formation of a phosphate layer to enhance coating adhesion.
- Passivation: Improvement of corrosion resistance.
- Electrophoretic Coating: Application of a uniform coating through electrophoresis.
- Tank Cleaning: Removal of excess paint from the workpiece surface.
- Ultrafiltration Washing: Final rinse using ultrafiltration water.
- Drying: Curing of the coating through drying.
- Unloading: Removal of finished workpieces from the line.
Process Parameters
| Parameter Name | Parameter Range/Value | Description |
| Electrophoretic Voltage | 100-400 V | Adjusted based on workpiece material and coating thickness
requirements. |
| Electrophoretic Time | 2-5 minutes | Immersion time in the tank, affecting coating thickness and
uniformity. |
| Tank Liquid Temperature | 28-32 °C | Affects paint fluidity and deposition efficiency. |
| Solid Content of Tank Liquid | 18-22% | Proportion of solid components in the paint, affecting quality and
thickness. |
| pH Value | 5.8-6.5 | Acidity or alkalinity of the tank liquid, influencing paint
stability and deposition. |
| Conductivity | 1200-1600 µS/cm | Reflects the ion concentration in the paint. |
| Coating Thickness | 15-25 µm | Adjusted based on anti-corrosion requirements and workpiece
application. |
Composition of Electrophoretic Coating Equipment
The electrophoretic coating system comprises the following key
components:
- Electrophoretic Tank: The main tank for coating application.
- Transfer Backup Tank: Auxiliary tank for paint storage and transfer.
- Tank Circulation Filtration System: Ensures consistent tank liquid quality.
- Ultrafiltration (UF) Device: Separates and recycles water and impurities.
- Electrode and Electrolyte Circulation System: Maintains the electric field and current.
- Paint Temperature Control System: Regulates paint temperature for optimal results.
- DC Power Supply System: Provides the necessary electrical power.
- Paint Replenishment Device: Automatically maintains paint concentration.
- Post-Electrophoretic Cleaning Device: Cleans residual paint from workpieces.
- Electrophoretic Coating Room (Dust Cover): Protects the coating area from contaminants.
- Electrical Control Cabinet: Manages the operation of the entire system.
These specialized components, along with additional equipment such
as conveyors, drying ovens, and cooling chambers, form a complete
electrophoretic coating production line.
Equipment Parameters
| Parameter Name | Parameter Range/Value | Description |
| Tank Size | Customized based on production needs | Tank dimensions must accommodate workpiece size and production
volume. |
| Ultrafiltration System Flow Rate | 1-2 m³/h | Determines the cleaning efficiency and paint recovery rate. |
| Circulation Pump Flow Rate | 20-40 m³/h | Ensures uniform mixing and deposition of the paint. |
| Curing Temperature | 160-180 °C | Affects coating hardness and adhesion. |
| Curing Time | 20-30 minutes | Ensures complete drying of the coating. |
| Power Supply Capacity | Customized based on tank size and voltage requirements | Must meet the power demands of the electrophoretic process. |
Paint Parameters
| Parameter Name | Parameter Range/Value | Description |
| Paint Type | Cathodic Electrophoretic Paint/Anodic Electrophoretic Paint | Cathodic paint is more commonly used for superior anti-corrosion
performance. |
| Paint Solid Components | Epoxy Resin, Pigments, Additives, etc. | Main components affecting coating performance and appearance. |
| Paint Viscosity | 20-30 s (Ford Cup) | Influences paint fluidity and coating results. |
Environmental Parameters
| Parameter Name | Parameter Range/Value | Description |
| Wastewater Discharge | Near Zero Discharge | Achieved through EDRO technology and counter-current water
replenishment. |
| VOC Emissions | < 50 g/m³ | Volatile Organic Compound emissions, compliant with environmental
standards. |
Quality Control Parameters
| Parameter Name | Parameter Range/Value | Description |
| Coating Adhesion | ≥ 5 MPa | Bonding strength between coating and substrate, evaluated by
cross-cut or pull-off tests. |
| Salt Spray Resistance | ≥ 720 hours | Anti-corrosion performance in salt spray environments. |
| Surface Roughness | Ra < 0.8 µm | Smoothness of the coating surface, affecting appearance and
subsequent processes. |
Conclusion
Jingtu's electrophoretic coating lines combine cutting-edge
technology, efficient design, and eco-friendly processes to deliver
superior coating solutions for the automotive industry and beyond.
With a focus on quality, reliability, and sustainability, our
systems ensure exceptional performance and long-lasting results.
