In the presence of corrosive media and incentives (such as scratches, splashes, slag cutting, etc.), full complement cylindrical roller bearings can also undergo slow chemical and electrochemical reactions with corrosive media and be corroded, and Under certain conditions, the corrosion rate is quite fast and rust occurs. What are the precautions for the installation and use of self-priming pumps? Especially pitting and crevice corrosion. The corrosion mechanism of stainless steel parts is mainly electrochemical corrosion. a. Immersion method: Some small items are immersed in anti-rust grease, and the surface of the full-complement cylindrical roller bearing is adhered to a layer of anti-rust grease. Oil film thickness can be achieved by controlling the temperature or viscosity of the anti-rust grease. b. The brushing method is used for outdoor construction equipment or special-shaped products that are not suitable for immersion or spraying. When brushing, attention should be paid not only to avoid accumulation, but also to prevent leakage. c. Spray method Some large anti-rust objects cannot be oiled by immersion method. Generally, the rotary table bearing is sprayed with filtered compressed air with a pressure of about 0.7Mpa in a clean air place. The spray method is suitable for solvent-diluted anti-rust oil or thin-layer anti-rust oil, but perfect fire protection and labor protection measures must be adopted. The main factors affecting metal corrosion: Metal corrosion is caused by various internal and external factors, which can be summed up as follows: a. The chemical composition and structure of the metal material itself; b. The surface finish of the metal (oxygen concentration difference battery corrosion ); c. The composition and pH value of the solution in contact with the metal surface of the thrust cylindrical roller bearing; d. Ambient temperature and humidity; e. Various environmental media in contact with the metal surface. Analysis of the rust causes of stainless steel: 1 Chemical corrosion of stainless steel 1.1 Surface pollution Oil stains attached to the surface of the workpiece, dust of thin-walled cylindrical roller bearings and acids, alkalis, salts, etc. Some components undergo chemical reactions, resulting in chemical corrosion and rust. 1.2 Surface scratches The damage to the passivation film by various scratches reduces the protection ability of stainless steel. What precautions should be taken in the installation and use of self-priming pumps? , easy to react with chemical media, resulting in chemical corrosion and rust. 1.3 Cleaning After pickling and passivation, the cleaning is not clean, resulting in residual liquid remaining, which directly corrodes stainless steel parts (chemical corrosion). 2. Electrochemical corrosion of stainless steel 2.1 Carbon steel pollution The scratches caused by contact with carbon steel parts and the corrosive medium form galvanic cells and cause electrochemical corrosion. 2.2 Cutting The adhesion of rust-prone substances such as slag cutting and splashing of full-complement cylindrical roller bearings and corrosive medium form a primary battery and cause electrochemical corrosion. 2.3 Baking school The composition and metallographic structure of the flame heating area change unevenly, and form a galvanic cell with the corrosive medium to produce electrochemical corrosion. 2.4 Physical defects (undercut, pores, cracks, lack of fusion, lack of penetration, etc.) and chemical defects (coarse grains, poor chromium at grain boundaries, segregation, etc.) in the welding area and corrosive media form galvanic cells to produce electrochemical corrosion Hpsdw5. 2.5 Material Chemical defects (uneven composition, S, P impurities, etc.) and surface physical defects (porosity, blisters, cracks, etc.) of stainless steel are conducive to the formation of galvanic cells with corrosive media to produce electrochemical corrosion. 2.6 Passivation The poor passivation effect of pickling will cause uneven or thin passive film on the surface of stainless steel, which is easy to form electrochemical corrosion. 2.7 Cleaning The remaining pickling passivation residue and the products of chemical corrosion of stainless steel form electrochemical corrosion with stainless steel parts. 3 Stress concentration is easy to cause stress corrosion Many corrosion conditions and inducements (such as scratches, splashes, slag cutting, etc.) also have a significant adverse effect on the appearance quality of the product, and should and must be overcome.
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