Product Introduction:This dual-layer epoxy powder coating system is carefully formulated using
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This dual-layer epoxy powder coating system is carefully formulated using special epoxy resins and functional curing agents. The base layer, like other epoxy anti-corrosion powder coatings, offers excellent anti-corrosion properties. The outer layer, while maintaining anti-corrosion properties, enhances protective performance. Compared to a three-layer PE structure, it offers a lower comprehensive anti-corrosion cost.
Suitable for complex anti-corrosion environments, especially pipelines crossing through mountainous, river, and hilly areas.
Excellent adhesion between the base material and the epoxy layers.
Strong resistance to permeation and corrosion with high curing completion rate.
High hardness of the outer coating, dense coating, scratch-resistant, and good resistance to plant root penetration.
Excellent high-temperature cathodic disbondment resistance and superior mechanical properties.
| Test Item | Technical Specification | Remarks |
|---|---|---|
| Appearance | Uniform color, no lumps | Visual inspection |
| Particle Size Distribution | Residuals ≤4.0 at 150um, ≤0.2 at 250um | 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 |
| Test Item | Technical Specification | Remarks |
|---|---|---|
| Appearance | Smooth, uniform color, no bubbles, no cracks, allows slight orange peel | Visual inspection |
| Adhesion (Grade) | 1-2 | SY/T 0315-2005 |
| Negative Electrode at 24h (mm) | ≤6.5 | SY/T 0315-2005 |
| Negative Electrode at 28d (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 (1.5J at -30°) | 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 (1000h) | Coating shows no change | GB/T 1771-1991 |
Q/CNPC 38-2002 “Technical Specification for Double Layer Fusion Bonded Epoxy Powder Coating on Steel Pipes”
| Property | Specification | Remarks |
|---|---|---|
| Temperature | 200-230°C for 3-1.5 minutes | Medium-frequency heating recommended |
| Parameter | Specification | Notes |
|---|---|---|
| Applicable Equipment | Frictional charging spray, corona electrostatic spray | |
| Film Thickness | 250-500um | Adjustable according to workpiece requirements |
The product can be stored for 6 months in dry conditions below 30°C.
The used coating must be re-sealed immediately to prevent moisture absorption affecting performance.
Packaging: 20kg paper boxes lined with plastic bags.
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