How does the non-acid cleaning rust remover protect the metal substrate?
The non-acid cleaning rust removal machine protects the metal substrate mainly in the following ways:
Advantages of physical rust removal methods
Shot blasting: Shot blasting is the process of using a high-speed stream of projectiles to impact the rust layer on the metal surface. In this process, the size, speed and projection angle of the projectiles are carefully designed. For example, the selection of projectiles with the right particle size can ensure that when removing the rust layer, the metal substrate will not be damaged due to excessive impact force. Moreover, the shot blasting equipment can accurately control the projectile force and direction, so that the projectiles mainly act on the rust layer, and the rust layer is gradually peeled off through multiple impacts, while only a small, negligible deformation is produced on the metal substrate, thereby protecting the original performance and structure of the metal.
High-pressure water jet rust removal: High-pressure water jet rust removal uses a high-pressure water pump to generate strong water flow pressure, spraying water at high speed onto the metal surface. This rust removal method mainly relies on the impact force of water to remove the rust layer. Since water is a relatively mild medium, under the condition of reasonable control of water pressure and spray angle, it can penetrate into the gaps and holes of the rust layer and wash away the rust without chemically reacting with the metal matrix like chemical pickling. At the same time, modern high-pressure water jet rust removal equipment can adjust the water pressure according to the material of the metal and the thickness of the rust layer to avoid damage to the metal matrix due to excessive pressure.
Use of mild chemical or electrochemical methods
Environmentally friendly chemical rust removers: Some non-acid-washing rust removers use environmentally friendly chemical rust removers. The formula of these rust removers is specially designed, and its main ingredients can react chemically with iron oxide and other components in rust, but have low chemical activity to metal elements in the metal matrix. For example, some rust removers containing chelating agents can selectively dissolve rust. After rust removal is completed, the rust remover and rust residue can be removed through a simple rinsing step, and no corrosive substances to the metal will remain on the metal matrix, thereby protecting the metal matrix.
Precise control of electrochemical rust removal: In the process of electrochemical rust removal, the metal matrix is protected by precisely controlling parameters such as current density, electrode material and electrolyte composition. For example, when electrolysis is performed with the workpiece as the anode, the current density is reasonably set so that the rust is preferentially dissolved on the anode surface, while the metal matrix will not be dissolved in large quantities at a suitable current density due to its specific electrode potential and the polarization it is subjected to. At the same time, a suitable electrolyte is selected to ensure that it has good solubility for rust but minimal corrosion to the metal matrix, thereby achieving protection of the metal matrix.