Galvanized cable trays can be effectively coated with epoxy-polyester or polyester powder paints to enhance corrosion resistance, durability, and aesthetics.

Recommended Paint Types

1. Epoxy-Polyester Hybrid Coatings These coatings are applied as a powder resin on sendzimir galvanized steel and polymerized at 185–190°C for 15 minutes, achieving a thickness of 60–80 microns. They offer excellent adhesion, corrosion protection, and are suitable for humid, mild chemical, and urban environments .
2. Polyester Powder Coatings Applied similarly on galvanized steel and cured at 190–195°C, polyester coatings provide UV resistance and are suitable for indoor and outdoor use, including aggressive chemical and saline environments. They are ideal for applications where aesthetics are important .
3. Zinc-Rich or Duplex Systems Painting galvanized steel often uses a duplex system: first galvanizing, then applying a compatible paint. This combination ensures long-term corrosion protection and prevents peeling or bubbling due to the smooth zinc surface .

Surface Preparation

Proper surface preparation is critical for adhesion:

• Newly galvanized steel: Smooth and shiny; may require light etching or a primer to improve paint adhesion.
• Partially weathered steel: Dull or slightly oxidized; clean and lightly sand before painting.
• Fully weathered steel: Matte gray; remove debris and contaminants before applying primer or paint . Degreasing and phosphating treatments can further enhance corrosion resistance before painting .

Application Considerations

• Environment: Choose coatings based on exposure to moisture, chemicals, UV, or saline conditions.
• Thickness: Maintain recommended micron thickness (60–80 microns) for optimal protection.
• Curing: Follow proper polymerization temperatures to ensure adhesion and durability.
• Fire Resistance: For high-risk areas, water-based fireproof paints like AF Cable Coat can be applied to cable trays to prevent fire spread, though primarily designed for cables .

Benefits

• Enhanced corrosion resistance in industrial, commercial, and marine environments.
• Improved aesthetic appearance for visible installations.
• Increased service life and reduced maintenance costs.
• Compliance with standards for aggressive atmospheres (C4, C5-I, C5-M) and UV exposure . By selecting the appropriate paint type and following proper surface preparation and application procedures, galvanized cable trays can achieve long-lasting protection and maintain both functional and visual performance.