(DPS) Dual-Layer Epoxy Anti-Corrosion Powder Coating
We are a manufacturer based in China, specializing in high-quality (DPS) Dual-Layer Epoxy Anti-Corrosion Powder Coating for industrial clients worldwide. Technical support and custom formulation available.
Category：powder Coating, Special powder coatings | Brand：MT
Introduction
This dual-layer epoxy anti-corrosion powder coating system is formulated with specialized epoxy resins and functional curing agents. The base layer provides corrosion protection, while the outer layer adds a further protective barrier and improves surface durability. Compared with a three-layer polyethylene (PE) coating structure, this system may offer a lower overall anti-corrosion cost, depending on project conditions.
Applications
Designed for steel pipelines operating in demanding corrosion environments, particularly pipelines crossing mountainous terrain, rivers, and hilly areas.
Product Features
Interlayer Adhesion
Strong adhesion between the substrate and epoxy coating layers.
Corrosion Protection
Resistance to permeation and corrosion, with a high degree of cure.
Surface Durability
A hard, dense outer layer with scratch resistance and resistance to plant-root penetration.
Mechanical Performance
Designed for high-temperature cathodic disbondment resistance and mechanical durability.
Powder Coating Performance
Powder Performance Parameters
| Test Item | Technical Specification | Test Method / Remarks |
|---|---|---|
| Appearance | Uniform color, no lumps | Visual inspection |
| Particle Size Distribution | Residuals ≤ 4.0 at 150 μm; ≤ 0.2 at 250 μm | Q/CNPC 38-2002, Appendix C |
| Volatile Content (%) | ≤ 0.6 | Q/CNPC 38-2002, Appendix B |
| Gellation Time at 205 ± 3°C (s) | ≥ 12 | Q/CNPC 38-2002, Appendix A |
| Curing Time at 230°C (min) | ≤ 3 | SY/T 0315-2005 |
| Magnetic Substance Content (%) | ≤ 0.002 | GB/T 6570 |
Cured Coating Performance Parameters
| Test Item | Technical Specification | Test Method / Remarks |
|---|---|---|
| Appearance | Smooth, uniform color, no bubbles or cracks; slight orange peel permitted | Visual inspection |
| Adhesion (Grade) | 1–2 | SY/T 0315-2005 |
| Cathodic Disbondment at 24 h (mm) | ≤ 6.5 | SY/T 0315-2005 |
| Cathodic Disbondment at 28 d (mm) | ≤ 8 | SY/T 0315-2005 |
| Cross-Sectional Crack Rate | 1–4 | SY/T 0315-2005 |
| Coating Surface Porosity Rate | 1–4 | SY/T 0315-2005 |
| Bending Resistance (3°) | No cracks | SY/T 0315-2005 |
| Volume Resistivity | ≤ 1 × 10¹³ | GB/T 1410 |
| Electric Strength (MV/m) | ≥ 30 | GB/T 1408.1 |
| Impact Resistance (1.5 J at −30°C) | No leakage points | SY/T 0315-2005 |
| Chemical Resistance | Qualified | SY/T 0315-2005 |
| Wear Resistance (Abrasion Method) | ≤ 3 | SY/T 0315-2005 |
| Salt Spray Test (1,000 h) | No visible coating change | GB/T 1771-1991 |
Execution Standard
Q/CNPC 38-2002 — Technical Specification for Double Layer Fusion Bonded Epoxy Powder Coating on Steel Pipes
Curing Conditions
| Property | Specification | Remarks |
|---|---|---|
| Temperature and Time | 200–230°C for 3–1.5 minutes | Medium-frequency heating recommended |
Application Parameters
| Parameter | Specification | Notes |
|---|---|---|
| Applicable Equipment | Tribostatic spray or corona electrostatic spray | Select equipment according to the application process |
| Film Thickness | 250–500 μm | Adjust according to workpiece requirements |
Storage and Packaging
Storage Conditions
Store in a dry environment below 30°C.
Storage Period
Shelf life is 6 months under the specified storage conditions.
Packaging
20 kg paper cartons lined with plastic bags. Reseal opened packaging immediately to limit moisture absorption.
Contact our team for technical details, product specifications, and application recommendations for your pipeline anti-corrosion project.
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