Valve corrosion, is usually understood as the valve metal material in the chemical or electrochemical environment under the action of the damage suffered. As the "corrosion" phenomenon seen in the metal spontaneous interaction with the surrounding environment were, therefore, how the metal with the surrounding environment isolated or more of the use of non-metallic composite materials, then become common concern.
As we all know, metal corrosion damage on the role of the valve duration, reliability and service life have a considerable impact. The role of mechanical and corrosion factors on the role of the metal substantially increased the total contact surface wear. Valve in the operation, the friction surface of the total amount of wear and tear. Valve in the operation, the friction surface due to the same time, the mechanical role and Metals and the Environment to conduct chemical or electrochemical interaction of wear and damage results. Right valve, its climatic conditions, the complex pipeline of work; oil, gas and reservoir water medium, hydrogen sulfide, carbon dioxide and some organic acids appear to increase the destructive power of the metal surface, which quickly lose their ability to work.
Due to chemical corrosion of metals depends on the temperature, the friction parts of the mechanical load, lubricating materials contained in the sulfide and acid stability and media exposure duration and metals on the nitridation process of a catalyst, corrosion erosion of material elements of the metal conversion speed and so on. Therefore, the metal valve corrosion method (or measures) and synthetic materials, the application of the valve will become the subject of study, one of valve industry.
A metal valve preservation, understood as the metal coated valve to protect against corrosion on the conditions of protective layer (such as paints, pigments, lubricating materials, etc.), so that the valve either in the manufacturing, storage, transport or in the whole process of its use are not subject to corrosion.
The method of corrosion of metal valve determined by the needs of the term of protection, transportation and storage conditions, the valve construction features and materials, of course, to adapt to consider lifting the economic effects of corrosion.
Corrosion of metal valves and parts are mainly four kinds of ways:
1, the volatile corrosion inhibitor into the vapor in the atmosphere (using the resistance of paper parcel, blowing air through the product chamber suppression, etc.).
2, was inhibited using water and alcohol solution.
3, the anti-corrosion (Protection) Apply thin layer materials, the surface of the valve and its components.
4, will be resistance-based polymer thin film, or apply on the surface of the valve and its components.
(Note: At present, the valve manufacturer, widely used in lubricating materials, and water resistance to corrosion of solvent flow.)
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