Sand blasting and shot blasting to promote the reuse of iron and steel

Dalian sand blasting is a method to clean the surface of parts by blowing quartz sand out at high speed with compressed air. It is also called sand blowing in the factory. It can not only remove rust, but also remove oil. It is very useful for coating. It is often used for rust removal on the surface of parts; Surface modification of parts (this is the purpose of small wet sand blasting machine sold in the market. The sand is usually corundum and the medium is water);

In the steel structure, the application of high-strength bolts for connection is a relatively advanced method. Because the high-strength connection uses the friction between the joint surfaces to transfer the force, the quality requirements of the joint surface are very high. At this time, the joint surface must be treated by sand blasting. Shot blasting is to use the high-speed rotating impeller to throw out small steel shot or small iron shot and hit the surface of the part at high speed, so the oxide layer on the surface of the part can be removed. At the same time, steel shot or iron shot impacts the part surface at high speed, resulting in lattice distortion and deformation of the part surface and increasing the surface hardness. It is a method to clean the part surface. Shot blasting is often used to clean the casting surface or strengthen the part surface.

After the steel materials enter the factory, the raw materials of the steel shall be treated before processing to remove the scale and rust on the surface. After reaching the rust removal standard, the steel shall be coated with temporary protective primer to ensure that the steel will not continue to be corroded in the process of processing and manufacturing components. This stage of steel plate treatment is called steel surface pretreatment, which has the advantages of convenient construction, ensuring coating quality, saving manpower and financial resources Shorten the construction period of later coating works.

Shipbuilding at home. In the container and large machinery industries, Dalian shot blasting generally uses steel pretreatment methods, including shot blasting abrasive treatment, shot blasting abrasive treatment and acid pickling treatment. In order to obtain high-efficiency and high-quality automatic flow operation, there are only shot blasting and shot blasting treatment at present.

There are many anti rust methods, but the anti rust film can not cause harm to the coating, which is not considered by many people. The radiator industry mostly adopts low concentration sodium nitrite aqueous solution for passivation and rust prevention, and other inorganic salts are also used for rust prevention between processes. These methods will have an adverse impact on the coating quality.