Dual-Layer Epoxy Anti-Corrosion Powder Coating (External Coating)
We are a manufacturer based in China, specializing in high-quality Dual-Layer Epoxy Anti-Corrosion Powder Coating (External Coating) for industrial clients worldwide. Technical support and custom formulation available.
Category：powder Coating, Special powder coatings | Brand：MT
Introduction
Dual-layer epoxy anti-corrosion powder coating (external coating) combines a corrosion-inhibiting base layer with a hard, dense outer layer. The base gives barrier protection and cathodic-disbondment resistance; the outer layer adds hardness, scratch and root-penetration resistance — built for demanding pipeline routes across mountains, rivers and hilly terrain.
Features
AdhesionStrong bond to steel and between the two epoxy layers.BarrierHigh permeation and corrosion resistance; low cathodic disbondment at high temperature.
Outer LayerHard, dense, scratch-resistant, resists plant-root penetration.UsePipelines crossing mountains, rivers and hilly terrain; electrostatic spray.
Powder Parameters
| Item | Indicator | Test Method |
|---|---|---|
| Appearance | Uniform colour, no lumps | Visual |
| Volatile content, % | ≤ 0.6 | Q/CNPC 38-2002 App. B |
| Curing time at 230°C, min | ≤ 3 | SY/T 0315-2005 |
| Magnetic substance content, % | ≤ 0.002 | GB/T 6570 |
Cured Coating Performance
| Test Item | Indicator | Method |
|---|---|---|
| Appearance | Smooth, uniform, no bubbles/cracks; slight orange peel allowed | Visual |
| Adhesion, grade (24 h / 48 h) | 1–2 | SY/T 0315-2005 |
| Cathodic disbondment, 24/48 h, mm | ≤ 6 | SY/T 0315-2005 |
| Cathodic disbondment, 28 d, mm | ≤ 8 | SY/T 0315-2005 |
| Cross-section porosity, base layer | 1–4 | SY/T 0315-2005 |
| Bonding-surface porosity, base layer | 1–4 | SY/T 0315-2005 |
| Flexibility (0° / −30°), ordinary 2° | No cracks | Q/CNPC 38-2002 App. D |
| Flexibility (0° / −30°), enhanced 1.5° | No cracks | Q/CNPC 38-2002 App. D |
| Impact, 10 J, ordinary | No pinholes | Q/CNPC 38-2002 App. E |
| Impact, 15 J, enhanced | No pinholes | Q/CNPC 38-2002 App. E |
| Scratch, 30 kg, ordinary | Depth ≤ 350 µm, no leakage | Q/CNPC 38-2002 App. F |
| Scratch, 50 kg, enhanced | Depth ≤ 500 µm, no leakage | Q/CNPC 38-2002 App. F |
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