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| Anti corrosion measures for stainless steel magnetic pump
At present, the chemical pumps used by the major petrochemical, chemical, pharmaceutical, printing and dyeing and other chemical enterprises in China can be divided into metal pumps and non-metallic pumps. However, corrosion prevention is required. Corrosion resistance is generally made of stainless steel. There are stainless steel self-priming pumps and stainless steel magnetic pumps in stainless steel pumps. Most of the non-metallic materials are cast iron shells lined with high molecular polyethylene, such as desulfurization pumps and mortar pumps, and also lined with fluoroplastic materials, such as fluoroplastic pumps, fluoroplastic magnetic pumps, and fluoroplastic self-priming pumps. Today, let's talk about the anti-corrosion measures of the stainless steel magnetic pump in the stainless steel pump. Only with effective measures can the pump have a long life and safe use in chemical production.
According to the physical analysis, since ordinary chemical pumps are basically two-stage motor pumps, with a rotating speed of 2900r/min, cavitation and turbulence corrosion easily caused by excessive rotating speed are the main causes of corrosion, and F, Cl intergranular separation and local corrosion, as well as high solid content are another important causes of corrosion aggravation, so the pump should be modified. Through the query and test of relevant data, stainless steel was selected, A new type of stainless steel magnetic pump is also used. The performance parameters of the pump are consistent with those of the previous pump, while the speed is reduced by one time to 1450r/min, which significantly reduces the corrosion rate. At the same time, the dynamic seal is used to effectively prevent leakage.
Improve the material of the pump
Through the analysis of the medium composition, it is decided to select a high grade stainless steel, in which the composition of Cr, Mo and Ni shall be matched and controlled accordingly. In addition, a certain amount of CLl element shall be added to improve the corrosion resistance of the alloy, while improving the heat treatment process level of parts and the accuracy of spare parts processing. Stainless steel 304: general model; 18/8 stainless steel. Products such as: corrosion resistant containers, tableware, furniture, railings, medical equipment. The standard composition is 18% chromium plus 8% nickel. It is a non-magnetic stainless steel whose metallographic structure cannot be changed by heat treatment. GB grade is 0Cr18Ni9.
304 L: It has the same characteristics as 304, but is low in carbon, so it is more corrosion resistant and easy to heat treat, but has poor mechanical property, and is suitable for welding and not easy to heat treat.
The practice has proved that the measures taken by our factory are very effective to ensure the safety and stability of various corrosion media, can obviously solve the corrosion problem, and has achieved better economic and environmental benefits. Therefore, we believe that with the improvement and development of manufacturing technology in the manufacturing industry, the pump problem in the chemical industry will be gradually solved.
screw vacuum pump of leakage inspecti |
Anti corrosion measures for stainless steel magnetic pump
