Laser cleaning of rust and paint is an environmental protection work, which can remove oxides and other pollutants. Due to efficiency, more and more applications use laser cleaning. Pulsed fiber lasers (usually greater than 50W) are necessary. Traditional industrial cleaning methods are often considered tedious (and reasonable). Rust removal takes time and effort. The removal of oxides may involve specific hazardous chemicals for each material to be removed. In some cases, blasting and painting may damage the metal underneath. It is usually expensive to deal with these problems, but laser cleaning takes time and effort. This is an economical solution that reduces maintenance. If you doubt these statements of laser technology, please continue to read the role of laser in removing pollutants and coatings.

1. All materials have corrosion threshold: when laser beam is used to remove material layer or coating, laser corrosion will occur, which is the process behind all laser cleaning applications. If the laser beam is used for rust removal, if the laser beam hits the surface, the molecular bond of the dust or rust layer will be destroyed and ejected from the substrate. In a less professional term, as you can imagine, the layer to be removed will only be evaporated by the laser beam. Laser Etching: A simple way to understand the importance of the melting threshold is to throw the ball on the wall. If you don't throw it high enough, it will never reach the other side. Even if you throw the ball a thousand times, you will always fail. This also applies to laser derusting. The laser beam can emit 1000 times, but if the energy is lower than the corrosion threshold of the material used, nothing will be removed. Now each material has different characteristics, because the molecular bond is negative, so each material has a specific melting threshold. In order to successfully remove layers from a given material, the laser beam must transmit an energy higher than the corrosion threshold of a particular material.
2. High selective material removal

Let's continue our analogy and imagine a higher wall behind the first wall. The ball has enough energy to cross the first wall, but not the second wall. The ball bounced off the second wall and landed between the two walls. Similarly, no matter how many balls you throw, you always get the same result. You can pass through the first wall, but never pass through the second wall. Because each material has a corrosion threshold, when you try to remove unnecessary layers from an object, laser cleaning can distinguish between two or more materials. When there is a sufficient difference between the corrosion threshold of a given material and the material to be removed (i.e., the material with a lower corrosion threshold). It can be selected to keep other materials unaffected, for example, the threshold of rust removal is far lower than that of ordinary metals (such as steel and aluminum), as is the case with paint and oil. The large difference between the two allows the contamination and coating to evaporate completely without damaging the base material, but without sufficient energy to cause damage.