Antirust treatment of steel after shot blasting

Dalian sanding and derusting generally adopts mechanical methods for cast iron and steel products that cannot be removed by acid pickling and derusting. Sand blasting has been stopped due to serious lung disease. At present, metal shot blasting is widely used, and some equipment such as roll polishing and roll polishing are used for rust removal. The major disadvantages of degreasing and phosphating are that the cost is too high, the antirust period is short, and it is easy to rust in rainy days. After shot blasting, there is a layer of iron powder on the surface of the radiator, which is not easy to wash off after pressing under the action of electrostatic adsorption.

This layer of iron powder will cause a large consumption of phosphating solution; The film formed is also relatively loose; Short phosphating time, easy to rust; In addition, due to the rough surface and large surface area, the phosphating solution is consumed several times. It can be estimated that the consumption of phosphating after shot blasting is nearly 2 times higher than that of direct phosphating of steel pipe, and the phosphating cost is higher than that of zinc phosphating after pickling. The major problem after mechanical rust removal is the problem of rust return between processes. Although many people know, many enterprises still suffer losses due to the wrong treatment methods.

Oil stain, oxide layer and rust on the surface of steel radiator must be removed. Due to the limitation of environmental protection, many enterprises change the pickling and derusting process to shot blasting. The heating after shot blasting needs to be pressed twice, so it has become a thorny problem for enterprises to solve the problem of back rust after pressing. Quartz sand blasting uses compressed air as power to form a high-speed jet beam to spray spraying materials (copper ore, quartz sand, emery, iron sand and Hainan sand) to the workpiece surface to be treated at high speed, so as to change the appearance or shape of the outer surface of the workpiece surface,

Due to the impact and cutting effect of abrasive on the workpiece surface, the workpiece surface can obtain certain cleanliness and different roughness, and the mechanical properties of the workpiece surface can be improved. Therefore, it improves the fatigue resistance of the workpiece, increases the adhesion between it and the coating, prolongs the durability of the coating film, and is also conducive to the leveling and decoration of the coating.

Dalian sand blasting outsourcing service 1 should check the joints of the sand blasting machine. All joints of the sand blasting equipment (air pipe, bobbin interface, etc.) must be firmly installed and reliably connected. In the process of operation, the wear condition of air pipe and gauze tube should also be checked frequently. If there is serious wear condition, it must be replaced immediately. Then there is the need not to face people in the process of operation. In addition, when repairing the sand blasting equipment, be sure to stop the machine, release the air, and then open the cover.