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Surface Treatment (2)
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- Time of issue:2022-02-24 14:33
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(Summary description)The efficiency of blasting treatment is not only limited by the original state of the steel surface and the requirements of the rust removal grade, but also by the compressed air capacity and pressure, the type of abrasive, the diameter of the nozzle, the operation method and the experience of the workers.
Surface Treatment (2)
(Summary description)The efficiency of blasting treatment is not only limited by the original state of the steel surface and the requirements of the rust removal grade, but also by the compressed air capacity and pressure, the type of abrasive, the diameter of the nozzle, the operation method and the experience of the workers.
- Categories:News Center
- Author:
- Origin:
- Time of issue:2022-02-24 14:33
- Views:
There are four main methods of steel surface pretreatment, and the cleanliness and roughness they can achieve are very different:
1. Manual cleaning
The main tools for manual cleaning are shovels, scrapers, rust hammers, wire brushes, rough files, etc. This cleaning method is inefficient, poor in quality, and labor-intensive, and cannot remove all rust and oxide skin. Manual cleaning is only suitable for situations where other cleaning methods cannot be used.
2. Power tool cleaning
Power tool cleaning refers to a semi-mechanized rust removal process that uses various pneumatic or electric rust removal tools (grinding wheels, wire wheels) to drive various grinding materials by the kinetic energy generated by the high-speed rotation of the power tools to achieve the purpose of rust removal.
The biggest disadvantage of tool cleaning is the polishing effect. The polished surface will affect the adhesion of the layer.
The substrate treated by the above two methods is only used as a supplementary means of other processes due to the low quality of rust removal.
3. Flame cleaning
Flame cleaning is to use the high temperature and high heat of the flame to remove the old paint layer, grease, rust, oxide scale and other pollution. When carrying out flame cleaning, the deformation caused by local overheating of the structure should be avoided. The surface after flame cleaning should be brushed off with a wire brush to remove dust and loose oxide scale.
4. Spraying (throwing) treatment
Projectile treatment
In the projecting process, the centrifugal force generated by the impeller of the shot blasting machine rotating at high speed is used to project the rust-removing abrasive to the surface of the steel plate to be derusted at a high linear speed, so that the abrasive has an impact and friction effect on the steel surface, so as to achieve rust removal. A mechanical descaling process method for the purpose.
Projectile rust removal is an advanced rust removal process with high efficiency, low labor intensity, and automatic assembly operations. However, due to its poor adaptability and high investment, it is generally less used in the hydraulic metal structure industry.
Spray treatment
Jet treatment is a mechanical rust removal process that uses compressed air as the power to spray abrasives to the surface of the steel at high speed through hoses and nozzles to impact and cut the steel, so as to achieve the purpose of rust removal. Sandblasting is used for angular abrasives such as quartz sand, emery, iron sand, etc. Because of its low price and wide range of sources, it is the most commonly used in anti-corrosion construction of hydraulic metal structures.
Compared with blasting treatment, blasting treatment has the following advantages:
1. Strong adaptability, can clean both the outer wall and the inner wall of the workpiece;
2. Strong mobility, can be carried out indoors, or can be carried out in the open air or temporary sheds for temporary or surprise operations; less investment and less land occupation;
3. Simple operation and equipment maintenance; wide selection of abrasives.
The efficiency of blasting treatment is not only limited by the original state of the steel surface and the requirements of the rust removal grade, but also by the compressed air capacity and pressure, the type of abrasive, the diameter of the nozzle, the operation method and the experience of the workers.
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