Sand blasting of stainless tubes and pipes is a process of cleaning and roughening the surface of the substrate by the impact of high-speed sand flow. It uses compressed air as the power to form a high-speed jet beam to spray the spray material (copper ore sand, quartz sand, emery, iron sand, Hainan sand) to the surface of the workpiece to be treated at a high speed, so that the outer surface or shape of the workpiece changes. Due to the impact and cutting effect of the abrasive on the surface of the workpiece, the surface of the workpiece can obtain a certain degree of cleanliness and different roughness, and the mechanical properties are improved, thus improving the fatigue resistance of the workpiece. In addition, it 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.
The pre-treatment stage of the sandblasting process of stainless tubes and pipes refers to the treatment that should be carried out on the surface of the workpiece before it is sprayed and sprayed with a protective layer. The quality of the pre-treatment of the sandblasting process affects the adhesion, appearance, moisture resistance and corrosion resistance of the coating. If the pretreatment work is not done well, the rust will continue to spread under the coating, causing the coating to fall off in pieces. The surface that has been carefully cleaned and the workpiece that is generally cleaned simply can be compared with the coating by exposure method, and the lifespan can be 4-5 times different. There are many methods of surface cleaning, but the most commonly accepted methods are: solvent cleaning, pickling, hand tools, power tools.
Stainless tubes and pipes sandblasting is to spray quartz sand on the surface of the steel pipe with compressed air flow. The surface cleaning or modification sandblasting can be divided into dry sandblasting and wet sandblasting. The purpose of sandblasting is to remove molding sand and oxide scale on the surface of stainless tubes and pipes after casting, forging or heat treatment. Remove rust, carbon deposits and welding slag from the surfaces of stainless tubes and pipes. Improves the surface roughness of stainless tubes and pipes, thereby improving the adhesion of the covering behind them. Remove the burrs and directional wear marks on the edges of the ends of the stainless tubes and pipes, and make the surfaces of the stainless tubes and pipes dull.
Prepare for dry blasting. Oil-stained stainless tubes and pipes should be degreased before blasting and then air-dried. Because oily or wet surfaces affect the blasting effect. The most widely used abrasive is clean screened quartz sand, due to its low cost and availability. Compressed air should select appropriate pressure according to the wall thickness of stainless tubes and pipes required for sandblasting.