Valve corrosion and solutions

- May 31, 2018-

1. Corrosion of valves is usually understood as the damage of valve metal materials under the 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 matter of common concern.

2. As we all know, the corrosive damage of metal has a considerable influence on the duration, reliability and service life of the valve. The effect of mechanical and corrosive action factors on the metal greatly increases the total amount of wear on the contact surface. The total amount of wear on the frictional surface of the valve during operation. During operation of the valve, the frictional surface wears and breaks as a result of simultaneous mechanical action and chemical or electrochemical interactions between the metal and the environment. For valves, the complex working climatic conditions of pipelines; the presence of hydrogen sulfide, carbon dioxide, and certain organic acids in media such as oil, natural gas, and reservoir water increase the destructive power of the metal surface and quickly lose their ability to work.

3. Chemical corrosion of metals depends on temperature, mechanical load of friction parts, stability of sulphides contained in lubricating materials and their acid resistance, duration of contact with the media, and catalysis of metals on nitriding process, corrosion leaching The speed of the conversion of the molecule of the erodible material to the metal and so on. Therefore, the application of anti-corrosion methods (or measures) for metal valves and valves for synthetic materials has become one of the themes of current valve industry research.

4. Corrosion prevention of metal valves can be understood as applying protective layers (such as paints, pigments, lubricating materials, etc.) on the metal valves to protect them from corrosion, so that the valves can be manufactured, stored, transported or otherwise The entire process of use is not corroded.

5. The method of anti-corrosion of metal valves depends on the required protection period, transportation and storage conditions, valve construction characteristics and materials. Of course, the economic effects of decontamination are taken into account when adapting.

There are four main methods for corrosion protection of metal valves and their components:

1. Place the volatile corrosion inhibitors into the vapor atmosphere (enclosed with a resist paper, blow the air through the product chamber, etc.).

2. Use blocked water and alcohol solution.

3. Apply a thin layer of anti-corrosion (protection) material to the surface of the valve and its components.

4. Apply a thin film of a hindered film or polymer to the surface of the valve and its components.