Core Application Areas of Anti-corrosion Coated Steel Pipes

I. Guardians of Urban Lifelines: Municipal and Construction Sector

Water Supply and Drainage Pipeline Systems

Application Scenarios: Urban tap water supply pipes, fire hydrants, sewage discharge pipes, rainwater harvesting systems.

Anti-corrosion Requirements: The water being transported may contain chloride ions, microorganisms, and various acid and alkali impurities; buried pipelines face soil corrosion and stray current interference.

Coating Selection: Internal and external epoxy resin powder coating is the mainstream choice. It has a smooth surface, low resistance, is non-toxic and harmless, meets drinking water standards, and effectively resists chemical corrosion from water, ensuring the safety of water supply for the "last mile."

Building Structures and Gas Transmission

Application Scenarios: Building scaffolding (especially disc-lock scaffolding), structural pipes, gas pipelines for residential use.

Anti-corrosion Requirements: Scaffolding is exposed to wind, rain, and humid air for extended periods, requiring extremely strong rust resistance; gas pipes require absolute safety to prevent leaks.

Coating Selection: Hot-dip galvanized coatings are widely used in scaffolding due to their excellent resistance to atmospheric corrosion and mechanical protection. For gas pipelines, three-layer polyethylene or epoxy resin coatings are often used to ensure long-term sealing and safety in complex underground environments.

II. The "Main Artery" of Energy Transmission: Oil and Gas Industry

This is one of the fields with the highest and most stringent requirements for corrosion protection.

Long-Distance Oil and Gas Pipelines

Application Scenarios: Main oil and gas pipelines traversing deserts, swamps, mountains, and even the seabed.

Corrosion Protection Requirements: Facing soil stress, groundwater, bacteria, extreme temperature variations, and the high pressure and corrosiveness of the transported medium itself.

Coating Selection: Fusion-bonded epoxy powder (FBE) and its reinforced versions are classic internal corrosion-resistant coatings. External corrosion protection commonly uses three-layer polyethylene (3PE) or three-layer polypropylene (3PP) structures, which combine the adhesion of FBE and the mechanical protection of polyethylene, and are considered the "gold standard" for pipeline corrosion protection.

Oilfield Pipelines

Application Scenarios: Oil well casing, drill pipe, and pipelines.

Corrosion Protection Requirements: Direct contact with high-sulfur, high-salt, high-temperature, and high-pressure crude oil and natural gas, creating extremely harsh corrosive environments.

Coating Selection: The inner wall uses a special epoxy or modified epoxy coating to resist media erosion and chemical corrosion; the outer wall uses FBE or double-layer epoxy coatings depending on the downhole or seabed environment to ensure service life under extreme conditions.

III. The "Backbone" of Modern Transportation: Transportation Sector

Bridge Engineering

Application Scenarios: Piers, cables, and steel trusses of cross-sea and cross-river bridges.

Corrosion Protection Requirements: Withstanding the combined effects of multiple corrosive factors such as vehicle exhaust, de-icing agents, seawater salt spray, and ultraviolet radiation.

Coating Selection: Heavy-duty anti-corrosion coating systems typically include a zinc-rich primer (providing cathodic protection), an epoxy intermediate coat (barrier function), and a polyurethane topcoat (weather resistance and decoration), forming a long-lasting comprehensive defense.

Highway Guardrails

Application Scenarios: Corrugated beam guardrails, posts.

Corrosion Protection Requirements: Subjected to year-round sun and rain exposure, and contact with de-icing chemicals such as snow-melting agents, requiring coatings with excellent weather resistance and impact resistance.

Coating Selection: Hot-dip galvanizing or a composite coating of galvanized steel and polyester spraying is the mainstream solution, providing both long-term corrosion protection and color-coded warnings.

IV. The "Barrier" of Hydraulic and Marine Engineering: Applications in Harsh Environments
Hydraulic Engineering

Application Scenarios: Pressure steel pipes, gates, water diversion pipelines, and riverbank protection piles in hydropower stations.

Corrosion Protection Requirements: Long-term immersion in water flow, enduring silt erosion, aquatic organism attachment, and chemical corrosion from the water.

Coating Selection: Solvent-free epoxy glass flake coatings, heavy-duty epoxy coatings, etc., form thick films with strong adhesion, are wear-resistant and erosion-resistant, and effectively cope with the challenges of high-speed water flow.

Marine Engineering

Application Scenarios: Offshore oil platforms, subsea pipelines, port and wharf foundations, ship pipelines.

Corrosion Protection Requirements: This is the harshest corrosive environment, facing high salinity, high humidity, wave impact, marine organism attachment, and complex electrochemical corrosion.

Coating Selection: Utilizing the highest-grade heavy-duty anti-corrosion coating systems, such as thick-film epoxy coatings and polyurethane coatings, often used in conjunction with sacrificial anode cathodic protection systems to form a dual protection of "coating + electrochemical," providing decades of protection for marine steel facilities.

V. The "Bloodline" of Industrial Production: Industrial Processes

Chemicals and Pharmaceuticals

Application Scenarios: Process piping, material transport pipes, reactor-supporting piping.

Corrosion Protection Requirements: Transporting various highly corrosive chemicals such as strong acids, strong alkalis, and organic solvents.

Coating Selection: Depending on the specific medium, special epoxy, phenolic epoxy, or plastic coatings are selected to ensure safe, continuous production and product purity.

Power Industry

Application Scenarios: Desulfurization system pipelines and circulating water pipes in thermal power plants; various process pipelines in nuclear power plants.

Corrosion Protection Requirements: Desulfurization systems face sulfide corrosion from high-temperature, humid flue gas; circulating water pipes face corrosion from microorganisms and water quality.

Coating Selection: High-alloy or glass flake resin linings are commonly used in desulfurization systems; high-performance epoxy coatings are frequently used for circulating water pipes.