Chemical treatment: It mainly uses acidic or alkaline solution to chemically react with oxides and oil on the surface of the workpiece to dissolve it in acidic or alkaline solution to achieve the purpose of removing rust scale and oil stain on the surface of the workpiece. The chemical treatment is suitable for the cleaning of thin plates, but the disadvantage is that if the time is not properly controlled, even if a corrosion inhibitor is added, the steel can be over-etched. For more complicated structural electronic balance parts and perforated parts, after acid pickling by acidic solution, the residual acid immersed in the gap or cavity is difficult to be completely removed. If improperly treated, it will become a hidden danger of corrosion after the workpiece, and the chemical is volatile. The cost is high. It is difficult to handle the chemical discharge after the tinplate. If it is not handled properly, it will cause serious pollution to the environment. As people's environmental awareness increases, this treatment is being replaced by mechanical treatment.
Mechanical treatment: mainly includes shot blasting and shot peening. Shot blasting is a method of accelerating the projectile by centrifugal force and projecting it to the workpiece for rust removal. However, the flexibility of shot blasting is poor, limited by the site, and there is some blindness when cleaning the workpiece. It is easy to produce a dead angle that cannot be cleaned on the inner surface of the workpiece. The structure of the equipment is complex, and there are many wearing parts, especially the parts such as blades are worn out quickly, the maintenance time is high, the cost is high, and the one-time investment is large.
The shot peening is divided into a grinding machine for shot blasting and sand blasting. The surface treatment is carried out by shot peening, and the impact force is large, and the cleaning effect is obvious. However, the treatment of the sheet metal workpiece by the shot peening is easy to deform the workpiece, and the steel shot hits the surface of the workpiece (whether shot blasting or shot peening) to deform the metal substrate. Since Fe3O4 and Fe2O3 have no plasticity, the stripping after peeling, and the oil film and The substrate is deformed together, so the shot blasting and shot peening cannot completely remove the oil stain on the workpiece with oil stains. In the existing surface treatment method of the workpiece, the best cleaning effect is blast cleaning. Sand blasting is suitable for cleaning surfaces with high surface requirements. However, the current general blasting equipment in China is composed of original bulky sand transporting machinery such as hinges, scrapers and bucket elevators. The user needs to build a deep pit and make a waterproof layer to install the machine. The construction cost is high, the maintenance workload and maintenance cost are great, and a large amount of dust can not be removed during the sand blasting process, which seriously affects the health of the operator and pollutes the environment. .
A common instrumental electronic balance in the paint industry is the adjustable applicator for coating film thicknesses of different film thicknesses.
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Http://news.chinawj.com.cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn
Graphite Powder soft, dark gray; greasy feeling, can contaminate the paper. Hardness of 1 to 2, along the vertical direction with the increase in the hardness of the hardness can be increased to 3 to 5. Specific gravity of 1.9 to 2.3. In the isolated oxygen conditions, the melting point of more than 3000 ℃, is one of the most resistant minerals. At room temperature, the chemical properties of Graphite powder is relatively stable, insoluble in water, dilute acid, dilute alkali and organic solvents; materials with high temperature conductive properties, do refractory materials, conductive materials, wear-resistant lubricating materials.
Graphite powder is widely used, according to its different use, we can be divided into the following categories of graphite powder
1. Scale graphite powder
Flake Graphite powder is the most widely used, but also processed into other graphite powder of the original material, scaly graphite powder specifications from 32 to -12000 mesh range, scaly graphite powder toughness is good, with good thermal conductivity and corrosion resistance, can be used as refractory Materials, wear-resistant lubricating materials, conductive materials, casting, Fansha, die and high temperature metallurgical materials
2. Colloidal Graphite powder
Colloidal graphite is formed by the average dispersion of graphite particles below 2u meters in an organic solvent. Colloidal graphite is a viscous suspension of black filaments. Colloidal graphite powder with high quality Natural Flake Graphite performance, in high temperature conditions with special oxidation resistance, self-lubricating and plasticity, at the same time with good conductivity, thermal conductivity and adhesion, mainly used in sealing, metallurgical stripping and other industries
3. Ultrafine graphite powder
Ultrafine graphite powder specifications are generally between 8000 mesh -10000 mesh, mainly used in powder metallurgy release agent, the production of graphite crucible, the battery anode and make conductive materials additives
Nano-graphite powder main specifications for the D30 50 100 400 nm, nano-graphite powder process is more complex, low production rate, so relatively high prices, mainly used in anti-corrosion coatings, lubricants additives, grease additives, precision graphite seal And other industries, in addition, nano-graphite powder in scientific research institutions also has a high application value
5, High Purity Graphite powder
Graphite Powder
Graphite Powder,Nano-Graphite Powder,Graphite Carbon,Carbon Brush For Graphite Powder
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