3-Layer Polyethylene (FPE) Anti-Corrosion Epoxy Powder Coating

Surface Finish Options Overview

Product Introduction:
This product is formulated using epoxy resin and phenolic epoxy resin, designed and manufactured according to GB/T 23257-2009. It features high reactivity, strong adhesion, high cross-link density, and excellent resistance to chemicals, cathodic disbondment, and impact.

Product Usage:
Suitable for anti-corrosion coatings on various oil and gas pipelines.

Product Features:

Excellent adhesion to the substrate.Appropriate gel time and interfacial properties, easily fusing with the intermediate adhesive layer to form a cohesive unit.Provides protection over a wide temperature range, ensuring long-term corrosion resistance.Superior high-temperature cathodic disbondment resistance.High coverage area and transfer efficiency.Low melting temperature, high reactivity, and high curing completion rate, with good mechanical properties.

Powder Coating Performance Parameters

Test Item	Technical Specification	Remarks
Appearance	Uniform color, no lumps	Visual inspection
Color	As per customer requirements	Color difference meter
Density (g/cm³)	1.4–1.6	GB/T 4472
Particle Size Distribution	Residuals ≤3.0 at 150um, ≤0.2 at 250um	GB/T 6654
Volatile Content (%)	≤0.6	GB/T 6654
Gellation Time at 200°C (s)	≥12	GB/T 6654-1986
Curing Time at 200°C (min)	≤3	GB/T 23257-2009 Appendix A

 

Cured Powder Coating Performance Parameters

Test Item	Technical Specification	Remarks
Adhesion (Grade)	≤2	GB/T 23257-2009 Appendix C
Negative Electrode at 48h5°C (mm)	≤8	GB/T 23257-2009 Appendix D
Negative Electrode at 30±5°C (mm)	≤15	GB/T 23257-2009 Appendix D
Bending Resistance at -20°C, 2.5°	No cracks	GB/T 23257-2009 Appendix E

Application Parameters:

Parameter	Specification	Notes
Applicable Equipment	Frictional charging spray, corona electrostatic spray
Film Thickness	120-150um	Adjustable according to workpiece requirements

 

Health and Safety:

Property	Specification	Notes
Toxicity	Non-toxic	Safe for handling and application
Flammability	Non-flammable	Reduces risk in storage and use
Regulation	GB15607-1995	Follow safety protocols for coating operations

 

Precautions:

Item	Specification	Notes
Mixing Powders	Do not mix with other types
Outdoor Use	Not recommended	May cause fading and chalking
Surface Preparation	Oil-free, water-free, surface treatment to Sa21/2 level (GB/T8923), anchor pattern depth 40-100um, clean surface from dust and abrasives
Storage	Ventilated, dry, below 30°C, away from heat sources, corrosive chemicals, and solvents, avoid strong light, maximum stack height 5 layers, keep packaging sealed
Curing Temperature	Preheat steel pipe surface to above 190°C for better curing completion rate

 

Compliance Standards:
GB/T 23257-2009 “Polyethylene Anti-Corrosion Coating for Buried Steel Pipelines”

Storage and Packaging:

Store in a dry environment below 30°C.Re-seal the packaging immediately after use to prevent moisture absorption.Packaged in 20kg paper boxes with an inner plastic liner.

This comprehensive approach ensures that the product’s quality and performance are maintained, while also providing clear guidelines for safe handling and application.

FAQ

1. What is Powder Coating?

Powder coating is a dry finishing process used to apply a protective and decorative coating on metal or other surfaces. Instead of using liquid paint, fine powder particles (usually made of polyester, epoxy, or hybrid resins) are electrostatically charged and sprayed onto a conductive surface. The coated object is then baked in an oven, where the powder melts, flows, and cures into a smooth, durable finish.

Key features:

Durable, hard finish

Resistant to scratches, corrosion, and UV

Environmentally friendly (no VOCs)

2. Benefits of Powder Coating

Powder coating offers several advantages over traditional liquid painting:

Durability: Resistant to chipping, scratching, fading, and wear.

Corrosion Protection: Provides excellent protection against rust and chemicals.

Environmentally Friendly: No volatile organic compounds (VOCs) and minimal waste.

Efficiency: Overspray can be collected and reused, up to 99% material utilization.

Uniform Finish: Smooth, even coating without runs or drips.

Cost-Effective: Single-coat systems can achieve high film thickness, reducing labor and energy.

Aesthetic Variety: Wide range of colors, textures, and effects.

3. What Temperature to Cure Powder Coating

The curing temperature depends on the type of powder used:

Epoxy powder: ~160–200°C (320–392°F)

Polyester powder: ~180–210°C (356–410°F)

Hybrid (Epoxy-Polyester) powder: ~180–200°C (356–392°F)

Typical curing time: 10–20 minutes depending on thickness and oven type.

Always follow the powder manufacturer’s specifications for best results.

4. Process for Powder Coating

The powder coating process usually follows these steps:

Surface Preparation:

Clean the surface thoroughly (remove oil, grease, rust, or dirt)

Methods: chemical cleaning, sandblasting, or phosphating

Pre-Treatment:

Apply a conversion coating or primer if needed to improve adhesion

Powder Application:

Spray the powder using an electrostatic spray gun or fluidized bed

Curing:

Bake the coated object in an oven at the recommended temperature for the powder type

The powder melts and forms a continuous, smooth film

Cooling & Inspection:

Let the coated item cool

Inspect for defects, uniform coverage, and desired thickness

5. How to Spray Powder Coat

Equipment Needed:

Electrostatic spray gun

Compressed air supply

Powder feed hopper or container

Grounding of the object

Steps:

Ground the object: Ensures the charged powder is attracted to the surface.

Spray evenly: Hold the gun 6–12 inches from the surface, moving in smooth, overlapping strokes.

Apply sufficient powder: Ensure full coverage without excessive buildup.

Cure immediately: Transfer the sprayed item to the curing oven to fuse the powder into a solid coating.

Tips:

Maintain consistent speed and distance while spraying.

Use proper ventilation to reduce airborne powder accumulation.

Test a small area to check film thickness and color before full application.