Professional E Coating Line for Metal Parts with Pre-spray Treatment and Electrophoretic Deposition Process

Technical Definition
Electrophoretic coating (also called E-coating, electrocoating, or electrophoretic deposition) is an electrochemical process where electrically conductive parts are immersed in a water-based paint solution. Through applied direct current, paint particles migrate and deposit uniformly onto the substrate surface, creating a continuous protective film.

Key Process Characteristics

• Water-Based Chemistry: Utilizes environmentally friendly aqueous paint emulsions

• Electrochemical Deposition: DC power enables controlled paint particle migration

• Automatic Thickness Control: Film thickness regulated by voltage and duration

• Complete Coverage: Recessed areas and complex geometries receive uniform coating

Production Line Process Sequence

1. Manual Loading: Operators place parts onto conveyor system

2. Pre-treatment Stage:

   • Chemical cleaning and surface activation

   • Phosphating or conversion coating

3. Electrophoretic Deposition:

   • Cathodic electrocoating tank (20-30°C)

   • Temperature-controlled air conditioning system

4. Post-treatment:

   • Ultrafiltration (UF) rinse recovery

   • Closed-loop water recycling

5. Curing Process:

   • Paint film cross-linking (160-200°C)

6. Cooling Phase:

   • Ambient temperature stabilization

7. Manual Unloading:

   • Finished parts removal

Industry Applications

• Automotive components (battery boxes, chassis)

• Appliance manufacturing

• Industrial equipment

• Consumer products