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Introduction to anti-corrosion methods for valve components

2020-10-29View Original

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  It is well known that metal corrosion and degradation have a significant impact on the service life, reliability, and operational lifespan of valves. The effects of mechanical and corrosive factors increase the overall wear amount on the contact surface of metals. The total wear of the friction surfaces during the operation of the valve. During operation, the frictional surfaces of the valve suffer wear and damage as a result of both mechanical actions and chemical or electrochemical interactions between the metal and its environment. For valves, the pipeline operating conditions are complex; the presence of hydrogen sulfide, carbon dioxide, and certain organic acids in mediums such as oil, natural gas, and oilfield water increases the corrosive effect on their metal surfaces, causing them to lose their operational capacity rapidly.   The corrosion of valves is generally understood as the degradation of the valve’s metal materials under chemical or electrochemical influences. Since corrosion occurs as a result of the spontaneous interaction between metal and its surrounding environment, how to isolate the metal from that environment or make more use of non-metallic synthetic materials has become a matter of widespread concern.       The chemical corrosion of metals depends on factors such as temperature, the mechanical load on the frictioning parts, the sulfides present in the lubricating materials and their resistance to acids, the duration of contact with the medium, the metal’s catalytic role in the nitridation process, and the rate at which molecules of corrosive substances transform the metal, among others. Therefore, the anti-corrosion methods (or measures) for metal valves and the application of synthetic material valves have become one of the current research topics in the valve industry.         The corrosion protection of metal valves involves applying protective coatings to them – such as paints, pigments, lubricants, and the like – to safeguard them from corrosion throughout the entire process, from manufacturing and storage and transportation to actual use. The method for protecting metal valves from corrosion depends on the desired duration of protection, the conditions of transportation and storage, the structural characteristics of the valves and their materials; of course, the economic benefits associated with eliminating the need for corrosion protection are also taken into consideration.       There are mainly four methods for preventing corrosion of metal valves and their components: 1. Introducing volatile corrosion inhibitors into the steam atmosphere (by wrapping them in inhibitor paper or forcing inhibitor-filled air to pass through the chamber of the product, etc.).       2. Use the inhibited water and alcohol solution.       3. Apply a thin layer of anti-corrosion (protective) material to the surface of the valve and its components.       4. Apply a layer of the passivated film or polymer to the surface of the valve and its components.

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