Rust refers to the oxide produced when the metal surface comes into contact with oxygen, water and acidic substances in the air, such as Fe0.Fe3O4.FeO3, etc., which is generally called rust. The rust removal methods of diesel generator sets mainly include mechanical method, chemical pickling method and electrochemical corrosion method. The following is a detailed introduction by Starlight Power.
1. The chemical method is a chemical method to dissolve the corrosion products on the metal surface to dissolve them. The principle of this phenomenon is the dissolution of metals by acid and the mechanical action of hydrogen generated in chemical reactions on the rust layer, which causes the rust layer to fall off. Common acids are hydrochloric acid, phosphorus sulfate and so on. Due to the different metal materials, the chemical composition of the rust-dissolving products used is also different. The selective rust remover and its use conditions are mainly determined by factors such as the type of metal, chemical composition, surface condition, dimensional accuracy of parts, and surface quality.
2. Electrochemical corrosion refers to putting parts into the electrolyte of direct current and removing rust through chemical reaction. This method is faster than the chemical method, can better protect the base metal and reduce acid consumption. Generally speaking, there are two situations: one is to treat the derusted part as the anode, and the other is to use the rusted part as the cathode. Anode rust removal is due to the dissolution of metal after electrification, and the oxygen on the anode tears the rust layer, causing the rust layer to separate. Cathodic rust removal is because the hydrogen generated after the cathode is energized can reduce the iron oxide and the hydrogen tears the rust layer, causing the rust to fall off the surface of the part. The first two methods, the main disadvantage of the former is that the current density is too large, it is easy to be excessively corroded, and cause damage to the surface of the parts, so it is suitable for parts with simpler shapes. Although hydrogen is easy to enter the metal, there is no problem of over-corrosion, which causes hydrogen embrittlement and reduces the plasticity of the parts. Therefore, it is necessary to choose an appropriate rust removal method according to the rusted parts. In addition, in actual production, a rust remover prepared from a variety of materials can be used to remove rust and passivate oil. Most metal rooms, except for metals such as zinc and magnesium, can be sprayed, brushed, dipped, etc., regardless of their size.
3. The mechanical method is to use the friction and cutting between the mechanical parts to remove the rust layer on the surface of the parts. Methods such as brushing, polishing, and sandblasting are usually used. Single small batch maintenance depends on manual use of wire brushes, scrapers, emery cloth and other brushes. Scrape or polish the rust layer. Batches of parts or conditional units can be driven by motors or fans to drive various rust removal tools, such as electric grinders, polishing, and rolling. Sand blasting and rust removal is the use of compressed air to spray sand with a certain size on the surface of the workpiece. It can not only remove rust quickly, but also can be used for painting, electroplating and other processes. After sandblasting, the surface remains clean and has a certain degree of roughness, which can enhance the bonding force between the coating and the component. For the surface of irrelevant parts, only mechanical rust removal can be performed.
In addition, the surface of the parts is coated with protective paint, which should be completely or partially removed according to the degree of damage and the requirements of the protective layer. After cleaning, it is ready to be sprayed and painted.
Hand tools are usually used, such as scrapers, sandpaper, wire brushes or hand-held brushes. Pneumatic tools are used for scraping, grinding, brushing, etc. Various organic solvents, alkaline solutions, etc. can be used as paint removers. Apply to the paint layer of the workpiece to dissolve and soften it, and then remove the paint layer with the help of hand tools.
In order to complete each cleaning process, a set of cleaning equipment for different purposes can be used, including spray water guns, bath water guns, spray gun water guns, integral cleaning machines, circulation cleaning machines, etc. In the end, what kind of equipment to choose depends on its use and production place.
Jiangsu Starlight Electricity Equipments Co.,Ltd. is a manufacturer of professional generators, diesel generator sets, Cummins generator sets, Volvo generator sets, etc. The company has advanced testing equipment, excellent production technology, professional manufacturing technology, perfect quality management system, and Strong R&D technical strength. It can provide 15KW-2500KW various specifications of universal, automatic, four protection, automatic switching, low noise and mobile, etc., high-quality, low-energy generating sets to meet customer power needs, and can also meet users' different voltages and different frequencies, as well as the power supply system of multiple units connected in parallel, welcome customers to inquire. For more details, please contact us with email@example.com