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Qinsun Instruments Co.,Ltd

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Fax:+86-21-6420 0566

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Powder Coating

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(DPS) Dual-Layer Epoxy Anti-Corrosion Powder Coating

Email:services@moutainchem.com

Specifications:

Product details

Product Introduction:
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.

Product Usage:
Suitable for complex anti-corrosion environments, especially pipelines crossing through mountainous, river, and hilly areas.

Product Features:

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.

Powder Performance:

Powder Coating Performance Parameters

Test ItemTechnical SpecificationRemarks
AppearanceUniform color, no lumpsVisual inspection
Particle Size DistributionResiduals ≤4.0 at 150um, ≤0.2 at 250umQ/CNPC 38-2002 Appendix C
Volatile Content (%)≤0.6Q/CNPC 38-2002 Appendix B
Gellation Time at 205±3°C (s)≥12Q/CNPC 38-2002 Appendix A
Curing Time at 230°C (min)≤3SY/T 0315-2005
Magnetic Substance Content (%)≤0.002GB/T 6570

Cured Powder Coating Performance Parameters

Test ItemTechnical SpecificationRemarks
AppearanceSmooth, uniform color, no bubbles, no cracks, allows slight orange peelVisual inspection
Adhesion (Grade)1-2SY/T 0315-2005
Negative Electrode at 24h (mm)≤6.5SY/T 0315-2005
Negative Electrode at 28d (mm)≤8SY/T 0315-2005
Cross-sectional Crack Rate1-4SY/T 0315-2005
Coating Surface Porosity Rate1-4SY/T 0315-2005
Bending Resistance (3°)No cracksSY/T 0315-2005
Volume Resistivity≤1*10¹³GB/T 1410
Electric Strength (MV/m)≥30GB/T 1408.1
Impact Resistance (1.5J at -30°)No leakage pointsSY/T 0315-2005
Chemical ResistanceQualifiedSY/T 0315-2005
Wear Resistance (Abrasion Method)≤3SY/T 0315-2005
Salt Spray Test (1000h)Coating shows no changeGB/T 1771-1991

Execution Standard:
Q/CNPC 38-2002 “Technical Specification for Double Layer Fusion Bonded Epoxy Powder Coating on Steel Pipes”

Curing Conditions:

PropertySpecificationRemarks
Temperature200-230°C for 3-1.5 minutesMedium-frequency heating recommended

Application Parameters:

ParameterSpecificationNotes
Applicable EquipmentFrictional charging spray, corona electrostatic spray
Film Thickness250-500umAdjustable according to workpiece requirements

Storage Period:

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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