Anti-corrosion measures for industrial valves

Valve corrosion is generally considered for damage to the metal material of the valve caused by the chemical or electrochemical environment. Since "corrosion" occurs in the spontaneous interaction between metal and the surrounding environment, corrosion prevention focuses on isolating the metal from the surrounding environment or using more non-synthetic materials. Here 3 way stainless steel ball valve manufacturer in india will discuss the ways to prevent valve corrosion.

Electrochemical protection: Cathodic and anode protection provide electrochemical protection. So-called anode shielding involves adding a direct external current to the metal shield to increase the anode potential in the positive direction. When it is raised to a certain point, a dense protective film forms on the surface of the metal anode, which is a passive film. Safety Concerns Anodic material is easy to deactivate.

Cathodic protection means that the protected metal is used as the cathode, and direct current is applied in the negative direction to reduce the potential. When a potential value is reached, the current wear rate decreases and the metal is protected. Also, you can protect a metal protected by cathodic protection from metal with a higher electrode potential than the protected metal. If zinc is used to conserve iron, then zinc and zinc are considered sacrificial metals. This cathodic protection method is used by cryogenic ball valves manufacturers in india for large valves and core valves and is an inexpensive, simple and effective procedure.

Metal surface treatment: Metal surface treatment processes include plating, surface penetration, surface oxidation passivation, etc. Its objective is to improve the corrosion resistance of metals and improve the mechanical energy of metals. Surface treatments are commonly used in the valve area. The wear-resistant valve stems is a problem that people pay attention to, and people have gained a lot of experience in manufacturing. Surface treatment methods such as nitriding, boron, chrome plating, and nickel plating are also used to improve corrosion resistance, wear resistance, and corrosion resistance. The valve precipitates on contact with air-filled asbestos, water vapour and gas nitride and hard chrome plating (stainless steel is not suitable for ionic nitride).

Choose wear-resistant materials according to the corrosive environment: Corrosion in the actual processing is very complex. Even if you use the valve material for the same medium, the liquid's resistance, pressure, and temperature will be special, and the corrosion of the medium on the substrate will be different. The corrosion rate increases 1 to 3 times for every 10 ° C increase in material temperature. The intensity of the medium has a significant influence on the corrosion of the valve material. When the concentration exceeds 6%, wear is significantly reduced. For example, aluminium is highly corrosive at concentrations of 80 per cent or more in concentrated nitric acid but highly corrosive at medium and low concentrations of nitric acid. While stainless steel is resistant to nitric acid dilution, corrosion is more severe in more than 95% concentrated nitric acid. The above examples show that the correct selection of stainless steel needle valve manufacturers in india will depend on certain conditions. Various wear factors must be evaluated and materials selected following the corresponding anti-corrosion manual.