Buried Pipeline Coating - Buried pipeline paint supply to various regions including Sichuan, Chengdu, Yunnan, Chongqing, Guizhou, etc. (Crown Paint 152^0825^6966 Manager Sun) Buried pipeline coating is a specialized anti-corrosion coating designed for underground or underwater metal pipelines (such as petroleum, natural gas, water supply pipelines, etc.). It provides long-term protection for pipelines in harsh environments like humidity, soil corrosion, and chemical media, extending their service life.

Core Features
Excellent Anti-Corrosion
Resists corrosive factors in soil such as moisture, salinity, microorganisms, and acidic substances.
Common anti-corrosion systems: coal tar epoxy, polyurethane, etc.

Strong Adhesion
Closely adheres to metal surfaces (e.g., steel pipes), preventing coating peeling.

Cathodic Disbondment Resistance
Compatible with cathodic protection systems, preventing electrochemical corrosion.

Outstanding Mechanical Properties
Resists soil stress, impact, and abrasion, adapting to underground environmental pressure.

Long-Lasting Durability
Designed lifespan typically exceeds 20 years, reducing maintenance costs.

Common Types of Buried Pipeline Coatings:
1. Coal Tar Epoxy Coating
Features: Low cost, water and soil corrosion resistance, requires reinforcement with fiberglass cloth.
Applications: Municipal water supply, drainage pipelines, medium and low-pressure petroleum pipelines.

2. Fusion-Bonded Epoxy (FBE)
Features: Seamless coating, strong adhesion, chemical corrosion resistance, requires high-temperature curing.
Applications: Long-distance oil/gas transmission pipelines, pipeline weld joint anti-corrosion.

3. Three-Layer Polyethylene (3PE)
Features: Epoxy powder + adhesive + polyethylene, ultra-high mechanical strength and anti-corrosion lifespan (over 30 years).
Applications: High-pressure oil and gas pipelines in harsh environments.

4. Polyurethane Anti-Corrosion Coating
Features: Good elasticity, acid and alkali resistance, excellent low-temperature application performance.
Applications: Chemical pipelines, buried pipelines in cold regions.

5. Epoxy Zinc-Rich Primer + Epoxy Mica Iron Oxide System
Features: Provides cathodic protection, mica iron enhances **barrier properties**.
Applications: Pipelines in highly corrosive soil areas.

Selection Guidelines
General Environments: Coal tar epoxy (cost-effective).
Harsh Environments: 3PE or FBE (high durability).
Flexible Protection Required: Polyurethane (e.g., pipelines in seismic zones).

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