Single-Layer Epoxy Anticorrosion Powder Coating (External Coating)

Single-Layer Epoxy Anticorrosion Powder Coating (External Coating) About

1. Product Overview

This product is carefully formulated using epoxy resin and functional curing agents. It features high reaction activity, excellent adhesion, and high cross-linking density. The cured coating film exhibits outstanding properties, including excellent chemical resistance, solvent resistance, cathodic disbondment resistance, flexibility, and impact resistance, providing long-term and reliable corrosion protection for external pipeline surfaces.

2. Product Features

(1) Excellent bonding strength with the substrate.

(2) Excellent leveling performance and high gloss of the coating surface.

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

(4) High surface hardness and dense coating structure, providing excellent resistance against penetration by plant roots and stems.

(5) The coating provides excellent antibacterial protection and resistance against root penetration.

(6) Low melting temperature, high reaction activity, high curing completion rate, and excellent overall coating performance.

3. Powder Coating Performance Parameters

Item	Quality Requirements	Test Method
Appearance	Uniform color, no agglomeration	Visual inspection
Color	According to customer requirements
Density (g/cm)	1.31.5	GB/T 4472
Particle Size Distribution (%)	Powder retained on 150 m sieve 3	GB/T 6554-1986
	Powder retained on 250 m sieve 0.2	GB/T 6554-1986
Non-volatile Content (%)	>99.4	GB/T 6554-1986
Softening Time (s)	100 s (180C)	GB/T 6554-1986
	60 s (200C)	GB/T 6554-1986
	30 s (230C)	GB/T 6554-1986
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, no adhesion defects or wipe marks; slight orange peel is acceptable	Visual inspection
2	Adhesion (Grade)	13	SY/T 0315-2005
3	Cathodic Disbondment Resistance (24 h) (mm)	6.5	SY/T 0315-2005
4	Cathodic Disbondment Resistance (28 days) (mm)	8.5	SY/T 0315-2005
5	Cross-section Porosity Rating	14	SY/T 0315-2005
6	Bond Interface Porosity Rating	14	SY/T 0315-2005
7	Flexural Resistance (3)	No cracks	SY/T 0315-2005
8	Volume Resistivity	>110 m	GB/T 1410
9	Dielectric Strength (MV/m)	>30	GB/T 1408.1
10	Impact Resistance (1.5 J, -30C)	No leakage points	SY/T 0315-2005
11	Chemical Corrosion Resistance	Qualified	SY/T 0315-2005
12	Abrasion Resistance (Sand Drop Method)	>3 L/m	SY/T 0315-2005
13	Salt Spray Resistance (1000 h)	No change in coating film	GB/T 1771-1991

Applicable Standard: SY/T 0315-2005

5. Precautions

(1) The steel pipe surface must be free from oil contamination and moisture. Surface preparation quality should reach Sa2 grade (GB/T 8923). The recommended anchor profile depth is 5090 m. Dust and abrasive residues attached to the steel pipe surface must be completely removed by air blowing. The preheating temperature should be controlled at 180230C.

(2) The product should be stored indoors in a well-ventilated and dry environment at temperatures below 30C, 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 the 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

Widely used for external anticorrosion protection of pipelines in industries including:

• Municipal engineering pipelines
• Water supply pipelines
• Drainage pipelines
• Sewage pipelines
• Circulating water pipelines
• Chemical industry pipelines
• Thermal power plant pipelines
• Other fluid transportation pipeline systems.

Reliable Pipeline Protection

Engineered for industrial-grade performance, this single-layer epoxy coating provides robust protection for water, oil, and gas pipelines. Its unique formulation ensures high dielectric strength (50 kV/mm), low water absorption, and outstanding flexibility, resulting in longer service life and reduced maintenance costs. The product delivers a consistent, aesthetically pleasing finish in blue or green, with color customization available to suit project requirements.


Simple and Efficient Application

The powder coating is applied using electrostatic spraying, ensuring uniform coverage and strong adhesion. With a curing temperature range of 180-220C, the process is optimized for efficiency and compatible with standard industrial pipeline coating operations. The user-friendly powder form comes in 25 kg sealed packs, maintaining product quality during storage and transport.


Certified for Industrial Standards

Our epoxy powder coating complies with renowned standards such as ISO 21809-2, DIN 30671, and SY/T 0315. Rigorous testing assures users of its impact resistance, flexibility, and corrosion protection. Excellent performance in salt spray/fog tests highlights its suitability for harsh external environments where pipelines are exposed to aggressive elements.