Anti-rust technology and rust reason analysis of full complement cylindrical roller bearings In the presence of corrosive media and incentives (such as scratches, splashes, slag cutting, etc.), stainless steel can also produce slow corrosion with erosive media. The chemical and electrochemical feedbacks are eroded, and under certain conditions, the erosion rate is fast and the corrosion phenomenon occurs. What are the precautions for the installation and application of the self-priming pump? Especially pitting and crevice erosion. The corrosion mechanism of stainless steel parts is mainly electrochemical corrosion. Techniques for applying anti-rust oil: a. Soaking method: A few small items can be immersed in anti-rust grease, and the cross-tapered roller full complement cylindrical roller bearing allows a layer of anti-rust grease to adhere to its surface. The thickness of the oil film can be achieved by grasping the temperature or viscosity of the anti-rust grease. b. The brushing method is used for outdoor construction equipment or finished products with unusual shapes 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. Spraying method A few large anti-rust objects cannot be oiled by immersion method. The rotary table full complement cylindrical roller bearing is usually 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 must accept good fire protection and task protection. The main components that affect metal corrosion: metal corrosion is caused by various internal and external components, which can be summarized as follows: a. The chemical composition and structure of the metal material itself; b. The surface finish of the metal (oxygen concentration difference battery erosion) ; c. The solution composition and pH value of the thrust cylindrical roller full complement cylindrical roller bearing in contact with the metal surface; d, the ambient temperature and humidity; e, various environmental media in contact with the metal surface. Analysis of the rust causes of stainless steel: 1. Chemical erosion of stainless steel 1.1 Surface contamination Oil stains attached to the surface of the workpiece, dust and acid, alkali, salt, etc. on the surface of the workpiece are converted into corrosive media under certain conditions, and the stainless steel Certain components in the parts produce chemical feedback, resulting in chemical attack and rust. 1.2 Surface scratches All kinds of scratches damage the passive film, which reduces the protection ability of stainless steel. What are the precautions for self-priming pumps in installation applications? , It is easy to produce feedback with chemical medium, resulting in chemical corrosion and rust. 1.3 After cleaning, pickling and passivation, the cleaning is not clean, resulting in residual liquid remaining, which simply corrodes stainless steel parts (chemical corrosion). 2 Electrochemical erosion of stainless steel 2.1 Carbon steel pollution The scratches and erosive media caused by contact with carbon steel parts form galvanic cells and produce electrochemical erosion. 2.2 The adhesion of rust-prone substances such as cutting slag, cross-roller full-complement cylindrical roller bearing splash, etc. and erosive medium form a primary battery and cause electrochemical corrosion. 2.3 The composition and metallographic structure of the heating area of ​​the baking school are changed and uneven, and the galvanic battery is formed with the erosive medium to produce electrochemical corrosion. 2.4 The physical defects of the welding area (undercut, pores, cracks, lack of fusion, incomplete penetration, etc.) and chemical defects (thick grains, poor chromium at grain boundaries, segregation, etc.) and the corrosive medium form a galvanic cell to produce electrochemical erosion Hpsdw5.2.5 The chemical defects of stainless steel (asymmetric composition, S, P impurities, etc.) and surface physical defects (porosity, blisters, cracks, etc.) are beneficial to the formation of galvanic cells with erosive media to produce electrochemical erosion. 2.6 Passivation Pickling and passivation results are not good, resulting in uneven or thin passive film on the surface of stainless steel, which is easy to form electrochemical corrosion. 2.7 The remaining pickling passivation residue after cleaning and the products of chemical corrosion of stainless steel and stainless steel parts form electrochemical corrosion. 3. Intensive stress is easy to cause stress erosion. Many rust conditions and incentives (such as scratches, splashes, cutting slag, etc.) also have a significant adverse effect on the surface quality of the product, which should and must be overcome.
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