Views: 0 Author: Site Editor Publish Time: 2026-07-27 Origin: Site
Epoxy coating is a protective layer applied onto heat exchanger surfaces (aluminum, carbon steel, base metal) to resist chemical corrosion, moisture, salt spray, acid/alkaline fumes. Widely used for ventilation heat recovery cores, air coolers, coil heat exchangers operating in harsh atmospheres.
Main Application Scenarios
Coastal areas: high salt mist / marine corrosive air
Food processing plants: cleaning vapors, mild acid & alkaline steam
Livestock farms: ammonia, humidity & organic waste gas
Light industrial workshops: weak acid/alkaline exhaust gas
Swimming pools: high humidity + chlorine vapors
Wastewater treatment ventilation facilities
Key Advantages of Epoxy Coated Heat Exchangers
Excellent anti-corrosion performance
Forms a continuous barrier film to isolate base metal from corrosive media (salt, chlorine, ammonia, mild chemical vapors), effectively preventing rust and pitting corrosion.
Cost competitive alternative
Far cheaper than fully stainless steel or titanium heat exchangers, delivering balanced corrosion protection for moderately corrosive working conditions.
Good adhesion to metal substrates
Proper pretreatment (degreasing, surface roughening) avoids peeling, blistering under normal operating temperature ranges.
Customizable coating thickness
Standard coating: 30–80 μm; heavy-duty epoxy coating up to 100–150 μm for severe corrosive environments.
Wide compatibility for crossflow / counterflow ventilation heat exchange cores
Can be used on aluminum crossflow & counterflow heat recovery cores for HRV/ERV ventilation systems.
Important Limitations & Technical Notes (critical for quotation & technical communication)
Temperature limit
Most standard epoxy coatings sustain continuous working temperature ≤80°C. High-temperature exhaust will cause coating aging, cracking and delamination. Not suitable for high-temperature flue gas.
Not for strong concentrated chemicals
Cannot resist concentrated strong acid, strong solvent vapor. For heavy industrial strong corrosive gas, stainless steel 316L or titanium material is required.
Coating affects thermal conductivity slightly
Epoxy film creates minor thermal resistance. Heat transfer efficiency will drop moderately compared with uncoated bare metal cores. Design margin needs to be reserved.
Coating quality relies on production process
Pinholes, incomplete coverage will lead to local corrosion failure. Strict quality control (electrostatic spraying, curing process) is essential.
Mechanical vulnerability
Hard impact or sharp scraping can damage the coating layer, creating corrosion starting points. Need care during transportation, installation and cleaning.
