Do valve parts forgings need regular anti-corrosion treatment?

Valve parts forgings usually require regular anti-corrosion treatment, as their working environment and material characteristics determine the existence of corrosion risks. In chemical, petroleum, marine engineering and other scenarios, valves are exposed to corrosive media (such as acid, alkali, salt solution or humid air) for a long time. Even if corrosion-resistant materials such as stainless steel and alloy steel are used for forgings, corrosion problems may still occur due to medium concentration, temperature fluctuations or local stress concentration. For example, stainless steel is prone to pitting corrosion in environments containing chloride ions, while alloy steel may fail due to intensified oxidation at high temperatures and pressures.
Anti corrosion treatment can be achieved through surface coating (such as galvanizing, spraying), chemical conversion coating (such as phosphating, passivation), or injection of corrosion inhibitors. For example, in marine environments, coating the surface of valves with epoxy resin can significantly reduce the salt spray corrosion rate; For high-temperature working conditions, the use of high-temperature resistant ceramic coatings can prevent the peeling of oxide skin. Regular treatment can not only extend the service life of valves, but also avoid safety hazards such as leakage and jamming caused by corrosion, ensuring the stable operation of the process system.
It should be noted that the anti-corrosion cycle needs to be comprehensively evaluated based on the characteristics of the medium, working conditions, and material corrosion resistance. For example, valves in acidic media require coating integrity checks every six months, while in ordinary freshwater environments, this can be extended to 1-2 years. By establishing a scientific maintenance plan, it is possible to effectively balance costs and equipment reliability, and reduce the risk of unplanned downtime.