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What are the parameters of valve corrosion
Valve corrosion is the main cause of valve failure. Chemical corrosion and electrochemical corrosion are two forms of valve corrosion. The corrosion rate of the valve depends on the temperature, pressure, and chemical properties of the valve flow stop valve. Once the valve seal is corroded, it needs to be repaired or replaced. The corrosion of the valve cannot be completely eliminated. We can do a good job of corrosion treatment through technical means and effectively reduce the corrosiveness of the valve.
First of all, to understand the corrosion rate, the corrosion rate is the thickness of the body material consumed per unit of time. The corrosion rate can be used to determine the useful life of the valve, and whether there is excessive corrosion of the valve, and whether there is a problem with the selection and use of the valve.
1, complete corrosion resistance: corrosion rate is less than 0.001 mm / year;
2. Extreme corrosion resistance: Corrosion rate 0.001 to 0.01 mm/year;
3, corrosion resistance: corrosion rate of 0.01 to 0.1 mm / year;
4, still corrosion resistance: corrosion rate 0.1 to 1.0 mm / year;
5, poor corrosion resistance: corrosion rate of 1.0 to 10 mm / year;
6, not corrosion: corrosion rate greater than 10 mm / year.
What are the measures to prevent corrosion in the valve manufacturing and design process?
1, the first is the selection of materials This is the most important factor in preventing valve corrosion. Under normal circumstances, water, oil, and gas are usually cast steel valves, if you have a corrosive medium such as acid and alkali, you must choose stainless steel, generally controlled at a temperature below 200 degrees, stainless steel in the medium will produce a passivation film, prevent further corrosion. The highly corrosive medium requires the use of a super corrosion-resistant alloy material at high temperatures. The medium is reducible, and the stainless steel material containing Mo is selected; the medium is oxidizing and the stainless steel material containing Cr is selected.
2, the surface coating paint coating valve surface is also commonly used anti-corrosion means. Elastomeric paint is sprayed on the surface of the elastic seat gate valve.
3. The lining material is used to isolate the medium from the valve body flow path. The lining material includes lining engineering plastic, lining natural rubber and various synthetic rubbers. It can only be used at lower pressures and reduced operating temperatures.
4, the surface plating valve surface chrome plating, nickel plating, copper plating can also effectively control the effect of corrosion.
Sanjing Valve specializes in producing high and medium pressure valves, electric valves, pneumatic valves, power station valves, high temperature valves, American standard valves, forged steel valves, stainless steel valves, hydraulic control valves, etc. Professional solutions include design, customization, complete sets, operations, and services. We are always committed to the leader in China's valve industry and provide you with the latest valve knowledge, best service and technical consultants. If you have any questions, you can call us and we will do our best to provide you with quality service. We are determined to become the world's China valve manufacturer
Article from: Yongjia Sanjing Valve Co., Ltd.