Fiberglass Reinforced Plastic (FRP) Corrosion Resistance

Glass fiber reinforced plastic (FRP) corrosion protection is a structural protection technology achieved through the composite of glass fiber reinforced materials and resins, widely used in corrosive environments such as chemical industry, metallurgy, power, and wastewater treatment. The following are its key points:

I. Corrosion Prevention Principle

Material Characteristics: Glass fiber offers high strength (carbon fiber, aramid fiber, basalt fiber, polyphenylene sulfide fiber, ultra-high strength high modulus polyethylene fiber, etc. can be used in special environments), while resins (such as nano-polymer corrosion-resistant materials, epoxy resin, vinyl resin, phenolic resin, etc.) form a dense protective film, blocking the penetration of various corrosive media. The combination of both provides impact resistance, acid and alkali resistance, as well as electrochemical corrosion resistance. Structural Advantages: The surface is smooth and sealed, preventing water and chemical substances from penetrating; the even distribution of glass fiber enhances the overall impermeability.

Section II: Construction Techniques

Surface Treatment: Concrete must be dealkalized and repaired; metallic substrates need to be sandblasted to achieve a Sa2.5 roughness level; optimal humidity is ≤80%, with temperature between 5-25℃. Multi-layer Construction: Three-coat-five-layer technique: Primer → Laying fabric → Resin coating → Repeat for three layers of fabric → Topcoat, five layers of resin; each layer must be compacted and overlap width should be 50mm; Five-coat-seven-layer technique: Used for environments with severe corrosion, such as strong acids and alkalis, where increased fabric and resin thickness is required. Curing and Coating: Naturally cured for 24-48 hours; environmental control is crucial; if acid-resistant tiles are to be applied later, quartz sand should be sprinkled after the topcoat to enhance wear resistance and anti-slip adhesion.

Section 3: Application Scenarios

Chemical Equipment: Alternative to stainless steel for pipeline and tank inner walls

Wastewater Treatment: sewage ponds, effluent ponds, industrial water ponds, oxidation pond corrosion protection;

Section 4: Cautionary Notes

Resin must be mixed according to the ratio (e.g., epoxy resin hardener = 100:20) and used within 30 minutes.

Construction Standard: Anti-corrosion Construction Code for Buildings GB50212-2014