What are the traditional rust removal methods?

Anti-rust methods: baking blue, electroplating, painting, embedding enamel and other methods, the surface can be plated with a layer of active metals such as magnesium, aluminum and zinc. Because zinc is more active than iron, zinc is oxidized and iron is protected from rust. Strong oxidizing substances can be used to passivate the iron surface and form an oxidation protective film.

1, manual derusting is the most primitive derusting method, and the tools used are emery cloth, sandpaper, scraper, wire brush, hammer chisel, etc. Remove rust, scale, scale, impurities and dirt by hand shoveling, grinding, scraping and sweeping. Manual derusting has high labor intensity, low work efficiency and poor labor protection. Generally, after cleaning, the metal surface still has rust and the quality is unstable. However, this rust removal method is simple and adaptable, and it is still a common rust removal method.

2. Mechanical grinding is to remove the rust layer by means of impact and friction with the help of mechanical drive. Abrasive cloth, sandpaper, grinding paste, wire brush, etc. Fixed on the wheel. When the wheel rotates, the rusted and corroded parts of the metal can be polished and polished, and then the rusted objects can be removed.

3. Drum derusting is to put metal workpieces and pig iron castings without special-shaped angles and external threads into a slowly rotating hexagonal or circular drum. Due to the rotation of the drum, dirt such as rust and scale is removed by friction and rolling impact.

4. Flame derusting is suitable for derusting the surface of steel structures and castings with a certain thickness. Its principle is to use the difference of thermal expansion coefficient between metal and oxide scale. The oxide scale will break off after heating, while the rust will break loose due to dehydration during heating.