Analysis and research indicate that one of the main causes of butterfly valve degradation is corrosion. The interior cavity is severely damaged since it comes into contact with the medium. The medium's transmission is impacted by corrosion because the valve diameter shrinks and the flow resistance rises. The valve body's surface is often positioned below or on the ground. Because the surface is exposed to wet air, rust is likely to occur. Where the inner chamber meets the medium, the valve seat is fully covered. Therefore, the most economical way to prevent corrosion in the external environment is to apply a surface coating treatment to the valve body and valve plate.

The valve body and bonnet's unmachined surfaces are painted with the surface layer color. We can rapidly identify the valve body's material and gain a better understanding of its properties thanks to its color marking.

     The valve body surface is comparatively separated from the surroundings once it has been painted. One term for this protective effect is a shielding effect. It should be noted, though, that a thin coating of paint cannot offer complete protection. When the coating is very thin, the structural pores let oxygen and water molecules flow freely because polymers have a certain amount of breathability. The thickness of the epoxy resin coating on the surface of soft-sealing valves must meet strict specifications. Anti-corrosion coatings should employ solid fillers with excellent shielding qualities and film-forming materials with low air permeability to increase the coating's impermeability. In order for the coating to attain a specific thickness and become dense and non-porous, the number of coating layers should be increased concurrently. 3. Inhibition of corrosion

     To increase the coating's protective effect, the paint's interior ingredients react with the metal to either passivate the metal surface or produce protective compounds. To prevent major negative consequences, you must be mindful of the paint composition when it comes to valves with unique needs. Furthermore, because of the degradation products produced by some oils and the drying effect of metal soaps, cast steel valves used in oil pipelines can also function as organic corrosion inhibitors.

   Electrochemical corrosion will develop beneath the dielectric penetrating layer when it comes into contact with the metal surface. Zinc and other metals that are more active than iron are employed as fillers in coatings. It will serve as a protective sacrificial anode, and zinc's corrosion products, zinc carbonate and zinc chloride based on salt, will fill in the gaps in the film and make it tight, significantly lowering corrosion and prolonging the valve's service life.

The three primary surface treatment techniques for valves are powder coating, galvanizing, and paint coating. Paint has a brief protection period and cannot be utilized for extended periods of time in a working environment. Pipelines are the primary application for the galvanizing process. Both electro-galvanizing and hot-dip galvanizing are employed. It's a complicated process. Phosphating and pickling are used in the pretreatment. The workpiece's surface will have residues of acid and alkali, which will cause corrosion. The galvanized layer is easily removed due to hidden risk. Galvanized steel resists corrosion for three to five years. Our JONLOO valves' powder coating provides thick coating, corrosion resistance, erosion resistance, and other qualities that can satisfy the valves' needs under water system operating conditions.

     Characteristics:

     ·Corrosion resistance: Steel bars coated with epoxy resin exhibit good corrosion resistance and a markedly diminished bonding strength with concrete. They are appropriate for use in corrosive media or humid industrial settings.

     ·Strong adherence: The epoxy resin molecular chain's polar hydroxyl groups and ether linkages give it a high degree of adhesion to a variety of materials. When epoxy resin cures, it shrinks little, internal tension is little, and the protective surface coating is difficult to remove and fails.

     ·Electrical characteristics: The cured epoxy resin system has good dielectric qualities, resistance to surface leakage, and resistance to arcs, making it a superb insulator.

     ·Mold Resistant: The cured epoxy resin system can withstand harsh tropical temperatures and is resistant to the majority of molds.

     Because of their exceptional resistance to corrosion, nylon sheets have found practical usage in a variety of applications, including the desalination of seawater, mud, water, and food.

    ·Performance outdoors: The salt spray test can be passed by the nylon plate covering. After more than 25 years in sea water, it hasn't flaked off, indicating that the metal components haven't corroded.

     ·Wear resistance: Excellent resistance to wear.

     ·Impact resistance: Doesn't tear off when struck hard.

The spraying process is workpiece pretreatment → dust removal → preheating → spraying (primer - trimming - topcoat) → solidification → cooling.

Using a spray Electrostatic spraying is the primary method of spraying. Electrostatic spraying can be separated into two categories based on the size of the workpiece: production line production and unit production. The workpiece turnover method is the primary distinction between the two procedures, which are identical. The spray unit is manually raised, and the spray manufacturing line uses a transmission chain for automatic transmission. The coating's thickness is regulated between 250 and 300. The protective effectiveness will be diminished if the thickness is less than 150 μm. Over 500 μm of thickness will result in decreased impact resistance, decreased coating adherence, and increased powder consumption.