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Anti-corrosion methods (or measures) of metal valves and the application of synthetic material valves

by:Sino Valves     2021-03-09
Corrosion of the valve is usually understood as the damage to the metal material of the valve under the action of a chemical or electrochemical environment. Since the 'corrosion' phenomenon occurs in the spontaneous interaction between the metal and the surrounding environment, how to isolate the metal from the surrounding environment or use more non-metallic synthetic materials has become a common concern. As we all know, the corrosion damage of metal has a considerable impact on the life, reliability and service life of the valve. The effect of mechanical and corrosive factors on metals greatly increases the total wear on the contact surface. The total amount of wear on the friction surface of the valve during operation. During the operation of the valve, the friction surface will be worn and damaged due to the simultaneous mechanical action and the chemical or electrochemical interaction between the metal and the environment. For valves, the climatic conditions of their pipelines are complicated; the presence of hydrogen sulfide, carbon dioxide and certain organic acids in media such as oil, natural gas, and oil layer water increases the destructive power of the metal surface and quickly loses its ability to work. Because the chemical corrosion of metals depends on the temperature, the mechanical load of the friction parts, the sulfide contained in the lubricating material and the stability of its acid resistance, the duration of contact with the medium, and the catalytic effect of the metal on the nitriding process, corrosion and erosion The conversion speed of the molecules of the substance to the metal, etc. Therefore, the anti-corrosion methods (or measures) of metal valves and the application of synthetic material valves have become one of the themes of current research in the valve industry. 1. The anti-corrosion of metal valves can be understood as coating the metal valve with a protective layer (such as paint, pigment, lubricating material, etc.) that protects it from corrosion, so that the valve can be manufactured, stored, transported or It is not corroded during the whole use. The anti-corrosion method of metal valves depends on the required protection period, transportation and storage conditions, valve structure characteristics and materials. Of course, it is suitable to consider the economic effect of removing anti-corrosion. There are four main methods for anti-corrosion of metal valves and their parts: putting volatile corrosion inhibitors into the steam atmosphere (wrapped with barrier paper, blowing to inhibit air from passing through the product chamber, etc.). Use blocked water and alcohol solutions. Apply a thin layer of anti-corrosion (protective) material to the surface of the valve and its parts. Coat the surface of the valve and its parts with a thin layer of hindered film or polymer. (Note: The current valve manufacturing enterprises widely use lubricating materials and water-blocking solution flow to prevent corrosion.) Second, the application of material valves Synthetic material valves are better than metal valves in many corrosive conditions. The first is corrosion resistance. Performance, followed by net weight, as for its strength, depends on the shape, arrangement and number of reinforcing fibers. (Generally speaking, the greater the percentage of fiber, the greater the strength of the synthetic material.) In valve applications, the weight content of the fiber basically ranges from 30%-40%, and its chemical stability is mainly determined by the potting in the final product The resin body characteristics of the fiber are determined. In a synthetic material valve, the solid polymer body can be either a thermoplastic (such as PVC-polyvinylidene fluoride, PPS-polyphenylene sulfide, etc.) or a thermosetting resin (such as polyester, vinyl and epoxy resin) Wait). Thermosetting resin maintains its strength at medium temperature better than thermoplastics (ie, thermosetting resin has a higher heat distortion temperature). (Note: In the operating conditions, the measurement of the thermal resistance of synthetic materials is called the heat distortion temperature.)
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