Metal corrosion is the primary cause of valve damage. Anti-corrosion protection is a critical factor to consider in valve design and application. For metal valves, surface coating treatment is the most cost-effective anti-corrosion solution.
Three Core Functions of Valve Surface Coatings
Barrier Protection
After coating the metal valve surface with paint, the substrate is isolated from the corrosive environment, which is defined as barrier protection. However, a single thin coating cannot achieve complete isolation. All polymer film-forming materials are breathable; micro-pores inside thin coatings allow water and oxygen molecules to penetrate freely. Therefore, strict thickness standards are enforced for epoxy coatings on soft-sealed valves.
Thin coatings deliver far weaker isolation performance compared with thick compact coatings. To boost coating impermeability, anti-corrosion paint should adopt low-permeability film-forming agents and high-shielding fillers. Multiple coating layers are required to reach the specified thickness and form a dense, pore-free protective film.
Inhibition Anti-Corrosion Effect
Functional ingredients inside the coating react with metal substrates to passivate the metal surface or form protective films, enhancing overall anti-corrosion performance. For valves customized for special working conditions, paint chemical composition must be carefully checked to avoid irreversible valve failure caused by incompatible media.
For cast steel valves used in oil pipelines, degradation products generated by the reaction between oil media and metallic soap driers in coatings serve as organic corrosion inhibitors to slow down metal oxidation.
Cathodic Electrochemical Protection
Once corrosive media and moisture penetrate the coating and reach the metal base, under-film electrochemical corrosion will occur. Fill the coating with metal powder more active than iron such as zinc to form a sacrificial anode protection system.
Corrosion products of zinc (basic zinc chloride and zinc carbonate) fill tiny gaps inside the coating, densify the protective film, restrain corrosion significantly and extend valve service life.
Our Main Anti-Corrosion Coating: High-Performance Epoxy Coating
Epoxy coating boasts comprehensive outstanding performance, widely applied in water supply, chemical, oil & gas and other harsh working conditions. Its key advantages are listed below:
Excellent Corrosion Resistance
Epoxy coating provides strong resistance against acid, alkali, moisture and corrosive media. Valves coated with epoxy resin maintain stable bonding strength with concrete, ideal for industrial environments with high humidity and strong corrosives.
Superior Adhesion
Epoxy molecular chains contain inherent polar hydroxyl and ether bonds, delivering ultra-high adhesion to cast iron, cast steel, ductile iron and all common valve materials. Low shrinkage rate during curing minimizes internal stress, preventing coating peeling, flaking and long-term failure.
Outstanding Electrical Insulation
Cured epoxy coating features high dielectric strength, excellent tracking resistance and arc resistance, suitable for insulation and anti-corrosion of valves matched with water supply, chemical and electrical projects.
Mold Resistance
Fully cured epoxy resin resists most molds and fungi, maintaining stable protective performance even under high-temperature, high-humidity tropical harsh environments.
High-Performance Valves with Complete After-Sales Support
Anti-corrosion treatment lays the foundation for long-term stable operation of engineering equipment. A durable fluid transmission pipeline system relies on industrial valves equipped with premium anti-corrosion coatings.
XVS Valve specializes in R&D, customization and mass production of industrial valves. We fully comply with international manufacturing standards and strictly control every procedure of surface blasting, spraying and curing. All our valves are coated with high-performance epoxy anti-corrosion coating, manufacturing corrosion-resistant, high-adhesion industrial & water supply valves for diverse harsh working conditions.
If you are searching for a valve supplier with stable quality and on-time delivery, requiring full quality control during procurement, professional one-on-one selection guidance and complete after-sales technical support, feel free to contact us for business cooperation.
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