The Dual-Layer Epoxy Anti-Corrosion Powder Coating (External Coating) is designed for highly demanding anti-corrosion applications, especially pipelines crossing mountainous areas, rivers, and hilly regions. You can apply this dual-layer coating via electrostatic spraying, where the base layer provides excellent corrosion resistance, and the outer layer enhances surface protection, hardness, and scratch resistance.
This coating demonstrates strong adhesion, high impermeability, resistance to plant root penetration, and excellent performance under high-temperature cathodic disbondment, ensuring long-term durability in complex environmental conditions.
You can use Dual-Layer Epoxy Anti-Corrosion Powder Coating in environments where corrosion protection and mechanical durability are critical. Typical applications include:
| Industry / Field | Typical Products / Parts | Benefits |
|---|---|---|
| Oil & Gas Pipelines | Transmission pipelines crossing rivers, mountains, or hills | Excellent corrosion resistance, high adhesion, protection against soil and root penetration |
| Industrial Pipelines | Chemical and process pipelines | Durable, scratch-resistant, and impermeable coating |
| Infrastructure | Water pipelines, high-risk outdoor metal structures | Long-term anti-corrosion performance in extreme environmental conditions |
This powder coating is formulated to meet international anti-corrosion and coating performance standards:
ISO 2808 – Paints and varnishes – Determination of film thickness
ISO 2409 – Cross-cut adhesion test
ISO 4624 – Pull-off adhesion strength
ISO 17872 – Cathodic disbondment resistance
ISO 1519 / ISO 1520 – Flexibility and cupping test
ISO 6272 – Impact resistance of coatings
ISO 2409 – Scratch and abrasion resistance evaluation
ISO 4628 – Evaluation of visual defects on coating surfaces
These standards ensure the coating maintains mechanical integrity, adhesion, and anti-corrosion properties under field conditions.
| Item | Description |
|---|---|
| Product Type | Dual-layer epoxy anti-corrosion powder coating (external coating) |
| Appearance | Uniform color, no lumps |
| Volatile Content | ≤0.6% |
| Curing Time | ≤3 min at 230°C |
| Magnetic Substance Content | ≤0.002% |
| Adhesion | ISO 2409: Grade 1–2 |
| Cathodic Disbondment Resistance | 24h ≤6 mm; 28d ≤8 mm (ISO 17872) |
| Base Layer Cross-Section Porosity | Level 1–4 (visual evaluation) |
| Base Layer Bonding Surface Porosity | Level 1–4 |
| Flexibility (Ordinary Grade 2°) | No cracks (0° / -30°) (ISO 1519 / ISO 1520) |
| Flexibility (Enhanced Grade 1.5°) | No cracks (0° / -30°) |
| Impact Resistance | Ordinary Grade 10J, Enhanced Grade 15J (ISO 6272) |
| Scratch Resistance | Ordinary Grade 30 kg ≤350 µm depth, Enhanced Grade 50 kg ≤500 µm depth (ISO 2409 / ISO 4624) |
| Surface Hardness | High (pencil hardness ASTM D3363) |
Dual-Layer Protection
You benefit from a base layer that ensures corrosion resistance and an outer layer that provides enhanced hardness, scratch resistance, and root penetration protection.
Excellent Adhesion and Flexibility
Strong adhesion to the substrate and between layers, combined with excellent flexibility, prevents cracking under mechanical stress.
High Mechanical and Environmental Durability
Resistant to impact, scratch, and high-temperature cathodic disbondment, supporting long-term pipeline integrity.
Uniform Appearance
Smooth, uniform finish with slight allowable orange peel, enhancing both functional and aesthetic quality.
Industrial B2B Application
Suitable for pipelines and structures in extreme environments, providing reliable anti-corrosion performance.
You receive Dual-Layer Epoxy Anti-Corrosion Powder Coating in industrial packaging designed for safe handling, storage, and transport:
| Item | Description |
|---|---|
| Standard Packaging | Sealed inner plastic bag + reinforced outer carton or drum |
| Net Weight | Typically 20 kg per package |
| Storage Conditions | Store in a well-ventilated, dry indoor area below 30°C; away from heat sources, chemical solvents, and strong light |
| Handling | Avoid long-term pressure, stacking height ≤4 layers, keep packaging sealed to prevent moisture and caking |
1. What substrates are compatible with this coating?
You can apply it to steel and metal surfaces, particularly pipelines exposed to complex outdoor environments.
2. How is the dual-layer system structured?
The base layer provides excellent anti-corrosion performance, while the outer layer enhances hardness, scratch resistance, and protection against root penetration.
3. What is the cathodic disbondment resistance?
You can expect ≤6 mm after 24 hours and ≤8 mm after 28 days, measured according to ISO 17872.
4. How resistant is this coating to impact and scratches?
Ordinary grade withstands 10J impact and 30 kg scratch (≤350 µm depth); enhanced grade withstands 15J impact and 50 kg scratch (≤500 µm depth), preventing leakage.
5. What surface preparation is required before application?
You should clean the steel surface of oil and moisture, achieve Sa2½ surface treatment (ISO 8501-1 equivalent), and ensure anchor pattern depth of 50–90 µm.
6. Can this coating be used in high-temperature conditions?
Yes. It exhibits high resistance to cathodic disbondment and thermal stress, suitable for pipelines in extreme climates.
7. How should the powder coating be stored?
Store in a dry, ventilated indoor environment below 30°C, away from chemicals and light. Avoid exceeding four layers when stacking and keep packaging sealed to prevent moisture.
Powder coatings can be categorized by resin system (epoxy, polyester, hybrid, polyurethane), appearance (smooth, texture, hammer, metallic, pearlescent), or performance level (anti-corrosion, heat-resistant, UV-resistant, architectural grade, automotive grade).
Powder coatings offer thousands of colors in gloss, matte, satin, metallic, candy, texture, wrinkle, hammer tone, wood grain, fluorescent, and other custom effects. Special powders can create soft-touch, anti-scratch, anti-fingerprint, or anti-graffiti surfaces.
The process generally includes surface pretreatment (degreasing, phosphating, chromating, sandblasting), drying, electrostatic spraying, curing in an oven, and cooling. A well-controlled pretreatment and curing process ensures strong adhesion and long service life.
Powder coatings are environmentally friendly, solvent-free, and produce minimal waste. They offer excellent corrosion resistance, weather durability, mechanical strength, and uniform film appearance. The coating is tough, impact-resistant, scratch-resistant, and has a long lifespan.
Powder coatings are widely used in appliances, aluminum profiles, architectural components, automotive parts, bicycles, furniture, outdoor equipment, machinery, electrical cabinets, pipeline systems, and general industrial and consumer goods.
Powder coating is a dry finishing technology where finely ground powder is electrostatically sprayed onto a metal or non-metal surface and then cured at high temperature. After curing, the powder melts into a continuous, durable, and decorative coating layer.
Powder coating protects the substrate from corrosion, weathering, chemical attack, and mechanical wear. It also provides decorative appearance with rich colors, gloss levels, textures, and special effects.
In many industrial applications, powder coating outperforms liquid paint. It forms a thicker and tougher coating, resists corrosion and chemicals better, and does not contain VOCs. It also provides excellent consistency and cost-effective mass production.
It is called powder coating because the coating material is a solid powder instead of a liquid paint. The coating is formed by melting and curing powder particles under heat.
Powder coatings include several families depending on resin chemistry:
• Epoxy powders
• Polyester powders
• Epoxy-polyester hybrid powders
• Polyurethane powders
• Acrylic powders
• Fluorocarbon (PVDF) powders
Each type has its own performance features such as corrosion resistance, UV resistance, chemical resistance, outdoor durability, or decorative properties.
Powder coatings are based on thermoset or thermoplastic resins combined with pigments, curing agents, fillers, additives, and in some cases metallic or effect particles. Common substrates include steel, aluminum, galvanized metal, MDF, and certain heat-resistant plastics.
The lifespan depends on powder type, film thickness, application method, pretreatment, and service environment. Indoor coatings can last more than 10–20 years. High-grade outdoor polyester or fluorocarbon powders can last 15–25 years or longer under UV exposure.
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