The pretreatment powder coating line is typically composed of the following sections:

1. Pre-cleaning Zone

• Removes large debris and contaminants.

2. Degreasing Section

• Uses chemical solutions to eliminate oils and greases.

3. Rinsing Stations

• Multiple stages to thoroughly wash off chemicals.

4. Surface Adjustment (Optional)

• Prepares the surface for optimal phosphate adhesion.

5. Phosphating/Conversion Coating

• Forms a protective layer to enhance powder adhesion.

6. Passivation/Treatment

• Stabilizes the phosphate layer and improves corrosion resistance.

7. Final Rinsing

• Removes residual chemicals before drying.

8. Drying Oven

• Evaporates water to ensure a dry surface for powder coating.

9. Inspection Area

• Quality check for pretreatment effectiveness.

10. Transition Conveyor

• Transports parts to the powder coating booth.

Each section plays a crucial role in ensuring the surface is properly prepared, leading to a durable and high-quality powder coating finish.

A powder coating line is an efficient and environmentally friendly surface treatment system designed to uniformly apply powder coatings to metal or non-metal workpieces. Its core processes include:

1. Pretreatment (degreasing, phosphating, etc.) →

2. Electrostatic Spraying (powder adheres to the workpiece via high-voltage static electricity) →

3. Curing (heating in an oven to melt and level the powder into a solid coating).

Compared with traditional liquid painting, it offers advantages such as higher paint utilization (up to 95%), zero volatile organic compound (VOC) emissions, greater coating hardness, and a wider color range. Widely used in industries including automotive, household appliances, and building materials.

Here is a case study of our pretreatment powder coating production line in Thailand. China Hengjiu Jinye specializes in surface treatment equipment, offering one-stop services including design, planning, manufacturing, installation, and after-sales support.