Common rust removal methods in anti-corrosion construction

　　Rust removal is a very important part in the industrial anti-corrosion process. It can be said that rust removal is a process that cannot be bypassed by any coating process. Rust is loose and has weak adhesion to the metal surface. Paint coating on rust will inevitably cause coating Falling off, causing the anti-corrosion coating to fail

　　Sand blasting and rust removal

　　A rust removal method that uses high-pressure air to bring out abrasives and spray them onto the surface of components. The cost of sand is low and it comes from a wide range of sources, such as river sand, sea sand and artificial sand. Nowadays, some recyclable sand blasting rooms are gradually using steel sand and steel shot instead of quartz sand and mineral sand with low reusability rate. Open sandblasting pollutes the environment greatly, has an impact on other operations, is troublesome to clean up the site, and pollutes the environment. Its use has been gradually restricted recently.

　　Vacuum sand blasting uses a vacuum to immediately retract the sprayed sand. This method is used for local rust removal.

　　Sandblasting is divided into two types: dry sandblasting and wet sandblasting

　　Dry sandblasting: Use 0.5-0.7MPa compressed air to drive sand or steel grit and spray it onto the steel surface at high speed to remove rust, oxide scale and various corrosive substances on the metal surface. And make the base material have a certain roughness.

　　Wet sandblasting: Use compressed air to bring out fully wet abrasives and spray them onto the steel surface at high speed to remove rust, oxide scale and various corrosive substances on the metal surface. This solves the problem of dry sandblasting pollution, but there will be flash on the surface of the base material. Rust occurs, so corrosion inhibitors must be added. This method has been widely used abroad.

　　Sand blasting is one of the most commonly used rust removal methods.

　　Shot blasting and rust removal

　　Centrifugal force is used to use a high-speed rotating impeller to throw out abrasives for surface cleaning. A mixture of steel shot and steel sand is often used as a cleaning abrasive. This method generally has high automation and is suitable for assembly line production, but is not suitable for large and special-shaped workpieces.