How do garden tools remove rusty stains?
1. Manual descaling
Manual rust removal is the most primitive rust removal method. Use emery cloth, sandpaper, scraper, wire brush, hammer chisel and other tools to remove rust, scale and impurities by hand shoveling, sanding, scraping and sweeping. Things.
2. Machine city polishing
Mechanical polishing is the use of mechanical driving force to remove the rust layer by impact and friction. For example, by fixing emery cloth, sandpaper, abrasive paste, wire brush, etc. on the wheel, the rusty part of the metal can be polished and polished when the wheel rotates to remove the rust.
3. Derusting the drum
Roller rust removal is to put metal workpieces and pig iron castings without special-shaped angles and external threads in a slow-rotating hexagonal or circular roller. Due to the rotation of the roller, the rust is removed by the impact of friction and rolling. And oxide scale and other dirt.
4. Flame derusting
Flame descaling is suitable for the descaling of steel structures and casting surfaces with a certain thickness. The principle is to use the difference in thermal expansion coefficient between metal and oxide scale. After heating, the oxide scale will break off and the rust will be dehydrated due to heating. , So that the rust layer is broken and loose.
5. Electric spark derusting
Electric spark rust removal is to use the different electrical conductivity and thermal expansion of the oxide scale and steel plate to remove rust. The metal workpiece to be cleaned is used as one electrode, and the round roller is used as the other electrode. When the round roller contacts the workpiece, a short circuit is generated to separate the oxide scale, and the rust is separated from the surface of the workpiece by mechanical impact.