Automotive Electrophoretic Coating Equipment for Corrosion Resistance

Equipment Description:

1. Process flow and parameters
Typical process steps
Pre-treatment: degreasing (alkaline solution) → phosphating (zinc or iron) → pure water washing → activation;
Electrophoretic coating: anodic electrophoresis (voltage 40-70V, time 2-5 minutes) → UF liquid spraying → pure water washing;
Post-treatment: drying (120-180℃, 20-40 minutes) → cooling → quality inspection.

2. Key parameter examples

3. Application Scenarios and Advantages
Applicable Fields: Corrosion-resistant scenarios such as automobile bodies, home appliance housings, and precision hardware.
Technical Advantages: Through closed-loop water circulation and ultrafiltration recovery systems, the coating utilization rate is increased to more than 90%, and wastewater discharge is reduced by 30%.

Main structures and components:

I. Main structure

1. Electrophoresis tank system

Main tank: Made of PP or stainless steel, designed as a boat-shaped or rectangular structure, the capacity is determined according to the workpiece size and film thickness requirements, and equipped with overflow auxiliary tank to control the liquid level.

Auxiliary tank: used to store overflow tank liquid, with a volume of 1/10 of the main tank, and linked with the main tank through a circulation pump to prevent the paint liquid from settling.

2. Anode system

Anode tube: Made of 316L stainless steel, ruthenium titanium tube or titanium metal, the surface is covered with a double-layer semipermeable membrane (pore size ≤0.1μm) to prevent the diffusion of impurity ions.

Anode liquid circulation module: integrated with liquid storage tank and circulation pump (flow rate 6-10L/min·m²), the conductivity is maintained at ≤1500μS/cm through an acid neutralization system (such as citric acid).

2. Core components

1. Circulation filtration system

Circulation pump: flow rate 1-5m³/h, tank bottom flow rate ≥0.4m/s, liquid surface flow rate ≥0.2m/s, prevent pigment sedimentation 78.

Filter device: coarse filter (50μm filter bag): intercept foreign matter to protect the circulation pump;
Precision filter (5μm filter element): reduce paint film particle defects.

2. Heat exchange system

Plate heat exchanger: adjust the tank liquid temperature to 28±1℃ through 7-10℃ cooling water or 40-45℃ warm water.

3. Ultrafiltration recovery system

Ultrafiltration membrane assembly: roll or tubular ultrafiltration membrane (molecular weight cutoff 5-10kDa), separate concentrated paint liquid and ultrafiltrate, paint recovery rate ≥95%.

UF liquid spray device: pressure 0.3-0.6MPa, used for post-stage flushing of workpieces to reduce paint loss.

‌4. Power supply and control system‌
‌DC rectifier‌: output voltage 40-70V, ripple factor ≤5%, support segmented boost (such as 10-15s to the working voltage).
‌PLC control module‌: real-time monitoring of conductivity, pH value and temperature, touch screen display and storage of data.

‌5. Post-processing equipment‌
‌Spray tank‌: multi-stage countercurrent water washing (pure water conductivity ≤50μS/cm) to remove floating paint.
‌Drying and curing equipment‌: drying room temperature 120-180℃, curing time 20-40 minutes, to ensure the adhesion of the paint film.

Features:

1.High cost performance: Based on the customer's product positioning and development strategy, and with economic affordability as the foundation, we achieve the best cost performance.
2.The advanced and meticulous design concept of the equipment, along with the highly automated industrial equipment, showcases the image of a modern and advanced enterprise.
3. It has high adaptability, meeting the current production requirements and reserving room for development, taking into account the needs of increased production and improved quality in the future.
4.Quality compliance strictly adheres to the ISO900 quality management system, with every minute detail of the entire equipment installation being strictly controlled.