Process and technology of sanding and derusting

Dalian desanding and derusting Factory 1. Chemical derusting method: it is mainly a derusting method that uses the chemical reaction between acid and metal oxide to remove the rust products on the metal surface of high-efficiency sand making machine, that is, the so-called acid pickling derusting, which can only be operated in the workshop;

2. Small pneumatic or electric derusting: it is mainly powered by electricity or compressed air, equipped with appropriate derusting device for reciprocating motion or rotary motion to meet the derusting requirements of various occasions;

3. High pressure water abrasive derusting: use the impact of high-pressure water jet (plus the grinding effect of abrasive) and water pry to remove the rust and coating on the steel plate of sand making machine. It is characterized by no dust pollution, no damage to the steel plate, greatly improving the derusting efficiency, up to more than 15m2 / h, and good derusting quality. However, the steel plate after derusting is easy to rust again, so it must be coated with special wet derusting coating, which has a great impact on the coating of general performance coatings;

4. Apply anti-oxidation paint: apply mineral oil, paint or fired enamel, plastic spraying, etc. on the surface of iron products of sanding machine. The steel surface is coated with a layer of metal that is not easy to rust by electroplating, hot plating and other methods, such as zinc, tin, chromium, nickel and so on. These metal surfaces can form a dense oxide film to prevent iron products from rusting due to contact with water, air and other substances. A dense and stable oxide film can also be formed on the surface of iron products by chemical methods to prevent rust of iron products.

The sand blasting process flow of sand blasting includes pretreatment stage and sand blasting process stage:

Pretreatment stage of sand blasting process: it refers to the treatment that should be carried out on the surface of the workpiece before spraying and plating protective layer.

The pretreatment quality of sand blasting process affects the adhesion, appearance, moisture resistance and corrosion resistance of the coating. If the pretreatment is not done well, the corrosion will continue to spread under the coating, causing the coating to fall off in pieces. After careful cleaning of the surface and generally simple cleaning of the workpiece, compared with the coating by exposure method, the service life can be 4-5 times different.

Sand blasting process stage: use compressed air as the power to form a high-speed jet beam, and spray the spraying materials (such as RZG garnet sand and natural emery) to the surface of the workpiece to be treated at high speed, so as to change the appearance of the outer surface of the workpiece. Due to the impact and cutting effect of the 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.