Reason And Solutions of Corrosion in Industrial Valves

Corroded Valves: Risks and Hazards

Valve corrosion is the leading cause of valve failure, and valve corrosion may lead to the valve’s short life and lousy performance.Valves play an indispensable role in regulating the flow of fluids across a wide spectrum of industries, from petrochemical plants to water treatment facilities. Yet,one persistent challenge faced by operators and engineers is the insidious threat of valve corrosion.Valve corrosion can result in diminished efficiency,expensive maintenance, and, at its worst, pose safety risks.

What Causes Corrosion on Valves?

To effectively thwart corroded valves,it is crucial to grasp the factors that contribute to this issue. 

Here are some of the primary causes:

Moisture:Valves in industrial settings are frequently exposed to moisture, which can significantly hasten the corrosion process. When moisture combines with oxygen,it can lead to the formation of rust on metal surfaces.

Chemical Exposure:Valves employed in chemical processing plants are especially susceptible to corrosion due to their contact with aggressive and corrosive chemicals.The corrosive combination of chemicals and high temperatures can be exceptionally damaging.

Gases:Specific gases can be corrosive to valve materials. For instance, hydrogen sulfide (H2S) is notorious for causing sulphide stress corrosion cracking, an extremely severe form of corrosion, in carbon steel valves.

Temperature Extremes:Extreme temperatures can expedite valve corrosion by accelerating the reaction rates of chemicals and moisture with valve materials. High temperatures can also give rise to stress corrosion cracking.

Abrasion:Valves can come into contact with abrasive materials in particular applications, such as slurries. This abrasive exposure can compromise protective coatings and expose the valve to corrosion.

How to prevent valve corrosion?

The anti-corrosion of the valve body is mainly based on the correct selection of materials.Although there are abundant anti-corrosion materials,it is not easy to choose the right one, because the problem of corrosion is very complicated. For example, sulfuric acid is very corrosive to steel when the concentration is low,and when the concentration is high, the steel is produced. Passivation film can prevent corrosion;hydrogen only shows strong corrosiveness to steel under high temperature and high pressure.The corrosion performance of chlorine is not great when it is in a dry state,but it is very corrosive when there is a certain humidity,and many materials cannot be used.The difficulty in selecting valve body materials lies in not only considering corrosion issues, but also factors such as pressure resistance and temperature resistance,whether it is economically reasonable,and whether it is easy to purchase.So it must be attentive.

1.The second is to take lining measures,such as lining lead, lining aluminum,lining engineering plastics,lining natural rubber and various synthetic rubbers.If the media conditions permit,this is an economical method.

2.Second,again,when the pressure and temperature are not high,the main material of the fluorine-lined valve can often be very effective in preventing corrosion.

3.In addition,the outer surface of the valve body is also corroded by the atmosphere,and generally steel materials are protected by painting.

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