(DPS) Recubrimiento en polvo anticorrosión epoxi de doble capa

Surface Finish Options Overview

Introducción del producto:
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.

Uso del producto:
Suitable for complex anti-corrosion environments, especially pipelines crossing through mountainous, river, and hilly areas.

Características del producto:

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.

Rendimiento del polvo:

Powder Coating Performance Parameters

Elemento de prueba	Especificaciones Técnicas	observaciones
Apariencia	Uniform color, no lumps	Inspección visual
Distribución de tamaño de partícula	Residuals ≤4.0 at 150um, ≤0.2 at 250um	Q/CNPC 38-2002 Appendix C
Contenido volátil (%)	≤ 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/T0315-2005
Magnetic Substance Content (%)	≤ 0.002	GB/T6570

Cured Powder Coating Performance Parameters

Elemento de prueba	Especificaciones Técnicas	observaciones
Apariencia	Smooth, uniform color, no bubbles, no cracks, allows slight orange peel	Inspección visual
Adhesion (Grade)	1 - 2	SY/T0315-2005
Negative Electrode at 24h (mm)	≤ 6.5	SY/T0315-2005
Negative Electrode at 28d (mm)	≤ 8	SY/T0315-2005
Cross-sectional Crack Rate	1 - 4	SY/T0315-2005
Coating Surface Porosity Rate	1 - 4	SY/T0315-2005
Bending Resistance (3°)	Sin grietas	SY/T0315-2005
Resistividad de volumen	≤1*10¹³	GB/T1410
Electric Strength (MV/m)	≥ 30	GB/T1408.1
Impact Resistance (1.5J at -30°)	No leakage points	SY/T0315-2005
Resistencia química	Calificado	SY/T0315-2005
Wear Resistance (Abrasion Method)	≤ 3	SY/T0315-2005
Salt Spray Test (1000h)	Coating shows no change	GB / T 1771-1991

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

Condiciones de curado:

Propiedad	Especificaciones	observaciones
Temperatura	200-230 °C durante 3-1.5 minutos	Medium-frequency heating recommended

Parámetros de aplicación:

Parámetro	Especificaciones	Notas
Equipo aplicable	Frictional charging spray, corona electrostatic spray
Espesor de la película	250-500um	Adjustable according to workpiece requirements

Periodo de almacenamiento:

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.