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| Brand Name: | CHG |
| Model Number: | AC-31 |
| MOQ: | 1 set |
| Price: | 100,000-200,000 USD |
| Payment Terms: | L/C,D/A,D/P,T/T |
| Supply Ability: | 10 sets per year |
Automotive Metal Pretreatment System for Electrophoretic Coating Lines
Integrated Surface Preparation Solution for E-Coating / KTL Applications
This metal pretreatment system is engineered for automotive components requiring electrophoretic coating (E-coating / KTL). The system prepares the workpiece surface before electrophoretic deposition by removing oil, oxides, scale, and other contaminants that may affect coating performance.
A properly designed pretreatment process provides a clean and activated metal surface, helping improve E-coat adhesion, corrosion protection, and coating consistency during subsequent production.
The equipment incorporates automatic process control and monitoring functions for important operating parameters such as bath temperature, liquid level, treatment time, and chemical conditions. Process configuration can be adapted according to the substrate material, workpiece characteristics, required coating performance, and production capacity.
Pretreatment Process Configuration
The pretreatment line incorporates multiple cleaning, rinsing, and surface activation stages before workpieces enter the electrophoretic coating section.
A typical process configuration for this system includes:
Pre-Degreasing → Degreasing → Rinse 1 → Rinse 2 → Acid Treatment → Rinse 3 → Rinse 4 → E-Coating
1. Pre-Degreasing
The first cleaning stage removes loose contamination and a portion of the oil present on the workpiece.
Pre-degreasing reduces the contamination load entering the main degreasing section and helps maintain stable downstream cleaning performance.
2. Degreasing
The workpieces then undergo more intensive chemical cleaning to remove:
Oil
Grease
Processing residues
Organic contamination
Remaining surface dirt
Effective degreasing is essential because residual contamination can interfere with subsequent chemical treatment and electrophoretic coating adhesion.
3. First Rinsing Stage
After degreasing, workpieces are rinsed to remove residual cleaning chemicals and contaminants carried over from the previous process.
This stage helps reduce chemical transfer between treatment sections.
4. Second Rinsing Stage
A further rinsing process improves surface cleanliness and prepares the workpieces for acid treatment.
Multiple rinse stages help maintain more stable chemical conditions throughout the pretreatment system.
5. Acid Surface Treatment
The acid treatment section removes surface oxides, scale, and other inorganic residues remaining on the metal substrate.
This process can help eliminate:
Oxide films
Scale residues
Surface impurities
Remaining inorganic contamination
The treatment creates a more suitable surface condition for subsequent processing and electrophoretic coating.
6. Post-Acid Rinse 1
After acid treatment, the workpieces undergo rinsing to remove residual acid and dissolved contaminants from the surface.
This prevents excessive chemical carryover into downstream sections.
7. Post-Acid Rinse 2
The final rinsing stage further cleans the workpiece before it enters the next coating process.
Maintaining a clean surface at this stage is important for achieving stable electrophoretic deposition and consistent coating quality.
Spray and Immersion Process Combination
Different treatment methods can be incorporated within the same pretreatment line according to process requirements.
Spray sections use strategically arranged rinse rings, pipes, and nozzles to provide effective surface coverage, while immersion treatment can be used where longer contact time or complete workpiece coverage is required.
For this system, the acid treatment section adopts a bath treatment configuration with a 10-meter effective treatment zone, while the surrounding cleaning and rinsing stages use spray treatment.
This combined arrangement provides flexibility in balancing:
Surface treatment effectiveness
Processing time
Chemical consumption
Equipment dimensions
Production capacity
Technical Configuration
|
Item |
Pre-Degreasing |
Degreasing |
Rinse 1 |
Rinse 2 |
Acid Treatment |
Rinse 3 |
Rinse 4 |
|---|---|---|---|---|---|---|---|
|
Rinse Rings |
6 |
6 |
4 |
4 |
Bath |
4 |
4 |
|
Rinse Tubes |
12 |
12 |
8 |
8 |
— |
8 |
8 |
|
Total Nozzles |
144 |
144 |
96 |
96 |
— |
96 |
96 |
|
Effective Treatment Zone |
3.0 m |
2.0 m |
2.0 m |
1.0 m |
10.0 m |
1.3 m |
Customized |
|
Spray Pump Material |
Cast Iron |
Cast Iron |
Cast Iron |
Stainless Steel |
Stainless Steel |
Cast Iron |
Stainless Steel |
|
Bath Level Control |
Automatic |
Automatic |
Cascade |
Automatic |
Automatic |
Cascade |
Automatic |
The above configuration represents a project-specific solution. Equipment specifications can be modified according to the required process, workpiece characteristics, and production conditions.
Workpiece Capacity
The pretreatment system is designed to accommodate automotive metal components with maximum dimensions of approximately:
1.1 m × 4.0 m × 2.0 m
Actual equipment dimensions, treatment zones, conveyor configuration, and process parameters can be engineered according to:
Maximum workpiece dimensions
Individual and carrier loading weight
Production capacity
Workpiece material
Surface condition
Required treatment chemicals
Conveyor speed
Factory space and layout
E-coating process requirements
Automatic Process Monitoring and Control
Stable pretreatment conditions are essential for maintaining repeatable E-coating quality.
Depending on the project requirements, the control system can monitor and manage key operating parameters including:
Bath temperature
Liquid level
Treatment time
Pump operation
Process sequence
Equipment operating status
Alarm conditions
Automatic liquid-level control and cascade rinsing arrangements can also be incorporated according to the requirements of individual process stages.
Advantages of the Pretreatment System
Typical Applications
This type of E-coating pretreatment system can be applied to various metal products, including:
Automotive battery housings
Automotive structural components
Chassis components
Metal frames and brackets
Fabricated steel components
Industrial machinery parts
Other products requiring electrophoretic coating
Customized E-Coating Pretreatment Solutions
Every pretreatment line should be configured according to the actual product, substrate, production capacity, and required coating performance.
Our engineering scope can include:
Pretreatment process design
Spray and immersion treatment equipment
Process tanks and circulation systems
Pumps, piping, and nozzle arrangements
Conveyor and material handling integration
Automatic process control
Equipment layout optimization
Integration with complete KTL / EPD coating systems
Contact us with your workpiece drawings, production capacity, substrate information, coating specifications, and available factory layout for a customized E-coating pretreatment system proposal.
Clarify this is a representative configurationResolve the process-stage numbering
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