At present, the sanitary pumps used by China's major petroleum, chemical, pharmaceutical, printing and dyeing chemical companies can be divided into metal pumps and non-metal pumps. However, anti-corrosion is required, and corrosion-resistance is generally made of stainless steel. Stainless steel pumps include stainless steel self-priming sanitary centrifugal pumps and stainless steel magnetic sanitary negative pressure pumps . Most of the non-metallic shells are cast iron and cast steel lined with high molecular polyethylene such as desulfurization pumps and mortar pumps, and also lined with fluorine plastic materials, such as fluorine plastic pumps, fluorine plastic magnetic pumps, and fluorine plastic self-priming pumps. Today we will 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 physical analysis, it can be known that since ordinary chemical pumps are basically two-stage motor pumps with a speed of 2900r/min, cavitation and turbulent corrosion caused by excessively high speed are the main causes of corrosion. F and Cl are separated from the crystal. Questions and local corrosion and increased solid content are another important cause of increased corrosion. Therefore, it is necessary to modify the pump. Through inquiries and tests on related data, stainless steel is selected and a new type of stainless steel magnetic pump is used. The performance parameters of the pump are consistent with the previous pumps, and the speed has been doubled to 1450r/min, the corrosion rate has been significantly reduced, and the dynamic seal is adopted to effectively prevent leakage.
Improve the material of the pump.
Through the analysis of the medium composition, it is decided to choose a high-grade stainless steel, in which the components of Cr, Mo, Ni are proportioned and controlled accordingly, and certain CLl elements are added to improve the F corrosion resistance of the alloy , At the same time improve the level of heat treatment technology of parts and the accuracy of spare parts processing, stainless steel 304: general model; that is, 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. The GB grade is 0Cr18Ni9.
304 L: Same characteristics as 304, but with low carbon, it is more resistant to corrosion and easy to heat treatment, but has poor mechanical properties. It is suitable for welding and products that are not easy to heat treatment.
Practice has proved that the measures taken by our factory are very effective in ensuring the safety and stability of various corrosive media, can obviously solve the problem of corrosion, and have 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.