Application industries, powder Coating

1. Product Overview

This double-layer epoxy powder coating system is carefully formulated using multiple types of epoxy resins and functional curing agents. The primer layer provides excellent corrosion protection similar to other epoxy anticorrosion powder coatings. The outer coating layer maintains excellent anticorrosion performance while further enhancing mechanical protection properties.

It is widely applicable in harsh corrosion environments, especially for pipeline crossings in mountainous areas, rivers, and hilly regions, where enhanced protection performance is required.

2. Product Features

(1) Excellent bonding strength between the primer layer and substrate, as well as between the epoxy coating layers.

(2) Outstanding resistance to penetration and excellent corrosion protection performance.

(3) The outer coating layer features high hardness and a dense coating structure, providing excellent scratch resistance and strong resistance against penetration by plant roots and stems.

(4) The coating system provides excellent resistance to both high temperatures and extremely cold environments.

3. Powder Coating Performance Parameters

Item	Quality Requirements	Test Method
Appearance	Uniform color, no agglomeration	Visual inspection
Particle Size Distribution (%)	Powder retained on 150 μm sieve ≤4; Powder retained on 250 μm sieve ≤0.2	Appendix C of Q/CNPC 38-2002
Volatile Content (%)	≤0.6	Appendix B of Q/CNPC 38-2002
Gel Time (205 ± 3°C) (s)	≥12	Appendix A of Q/CNPC 38-2002
Curing Time (230°C) (min)	≤3	SY/T 0315-2005
Magnetic Material Content (%)	≤0.002	JB/T 6570

4. Performance Parameters of Cured Powder Coating Film

No.	Test Item	Technical Requirements	Test Method
1	Appearance	Smooth surface, uniform color, no bubbles or cracks; slight orange peel is acceptable	Visual inspection
2	Adhesion (24 h or 48 h) (Grade)	1–2	SY/T 0315-2005
3	Cathodic Disbondment Resistance (24 h or 48 h) (mm)	6	SY/T 0315-2005
4	Cathodic Disbondment Resistance (28 days) (mm)	≤8	SY/T 0315-2005
5	Primer Layer Salt Porosity Rating	1–4	SY/T 0315-2005
6	Primer Layer Bond Interface Porosity Rating	1–4	SY/T 0315-2005
7	Flexural Resistance, 2° (0°C or -30°C), Standard Grade	No cracks	Appendix D of Q/CNPC 38-2002
8	Flexural Resistance, 1.5° (0°C or -30°C), Reinforced Grade	No cracks	Appendix D of Q/CNPC 38-2002
9	Impact Resistance, 10J (Standard Grade)	No pinholes	Appendix E of Q/CNPC 38-2002
10	Impact Resistance, 15J (Reinforced Grade)	No pinholes	Appendix E of Q/CNPC 38-2002
11	Scratch Resistance, 30 kg (Standard Grade)	Scratch depth ≤350 μm, no leakage points	Appendix F of Q/CNPC 38-2002
12	Scratch Resistance, 50 kg (Reinforced Grade)	Scratch depth ≤500 μm, no leakage points	Appendix F of Q/CNPC 38-2002

Applicable Standard: Q/CNPC 38-2002

5. Precautions

(1) The steel pipe surface must be free from oil contamination and moisture. Surface preparation quality should reach Sa2½ grade (GB/T 8923). The recommended anchor profile depth is 50–90 μm. Dust and abrasive residues attached to the steel pipe surface must be completely removed by air blowing.

(2) The product should be stored indoors in a well-ventilated and dry environment at temperatures below 30°C, away from heat sources, corrosive chemicals, and chemical solvents. Avoid direct exposure to strong sunlight. The maximum stacking height should not exceed 4 layers. Avoid prolonged compression and ensure that packaging remains sealed to prevent powder caking and moisture absorption, which may affect fluidization performance.

6. Applicable Application Process

Suitable for:

Electrostatic spraying

7. Application Areas

Suitable for pipeline anticorrosion applications in complex and harsh environments, especially:

• Pipeline crossings in mountainous areas
• River crossing pipelines
• Hilly region pipelines
• Other buried pipelines requiring enhanced mechanical protection and corrosion resistance.

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