Customized Pretreatment Spray System for Coating Machine in Powder Coating Production Line

Spray Cleaning for Surface Preparation
Before powder coating is applied, workpieces undergo a spray cleaning process to guarantee proper surface conditioning and strong coating adhesion.

Effective Surface Treatment
The spray pretreatment system is designed to:

• Eliminate oils, dirt, and other surface contaminants

• Form a consistent phosphating layer

• Improve corrosion resistance

• Prepare the substrate for excellent powder bonding

Engineered for Flexibility
Each system is built with:

• Advanced engineering solutions

• Custom designs tailored to client requirements

• Configurations adaptable to a wide range of production environments

Modular Pretreatment Sections
Every stage of the system includes:

• Sturdy spray booth construction

• High-precision spray nozzles and pumps

• Built-in solution tanks

• Optional heating modules, customized as needed

The Role of Spray Pretreatment in Powder Coating

Spray pretreatment is a critical stage in the powder coating workflow. By thoroughly cleaning and preparing the substrate, it enhances coating adhesion, extends durability, and improves the final surface appearance. Depending on production requirements, various methods may be used—most commonly multi-stage chemical spray cleaning, phosphating, and conversion coatings.

Common Pretreatment Steps

• Degreasing
  A cleaning solution is sprayed onto the workpiece to eliminate grease, oil, and other surface contaminants. This step is fundamental for achieving strong coating adhesion.

• Phosphating
  In this chemical treatment, a phosphate layer is deposited onto the surface. This thin film improves both adhesion and corrosion resistance, forming a solid foundation for the powder coating.

• Rinsing
  After each chemical stage, the workpiece is rinsed with water to remove residual chemicals and prevent surface contamination.

• Surface Conditioning
  Some systems incorporate a conditioning step, where the surface is roughened using abrasive media. This increases mechanical bonding, particularly useful for difficult substrates.

• Drying
  Before powder application, the parts are dried to remove any remaining moisture. A dry, contaminant-free surface is essential for a defect-free and durable finish.