Iron plate perforated mesh can be seen in all areas of life. Its unique structure and excellent performance advantages are widely used, but all metal products cannot avoid rust and corrosion, so how can iron plate perforated mesh effectively prevent rust?
1. Protective layer method: Cover the surface of the perforated mesh with a protective layer to isolate the matrix of the perforated mesh from the outside world to prevent rust.
1. Apply oil, vaseline and other greases on the surface of the perforated mesh to prevent rust. This anti-rust method has poor aesthetics. Applying oil on the surface of the perforated mesh is very easy to absorb dust, resulting in a thick layer of sludge on the surface of the perforated mesh.
2. Use spray painting or plastic spraying to prevent rust. After the perforated mesh is cleaned or sandblasted after production, spraying paint on the surface is a common surface rust prevention method. The paint colors are diverse. The perforated mesh after spray painting has a smooth surface and beautiful colors. The electrostatic powder spraying technology developed in recent years has gradually replaced the spray painting treatment. The perforated mesh after electrostatic powder spraying is much better than the effect of spray painting in terms of feel and color.
3. Use galvanizing to prevent rust. After the perforated mesh is produced, hot-dip galvanizing is used to prevent rust. It is a rust prevention method to ensure the long service life of the perforated mesh. The static service life of the perforated mesh after hot-dip galvanizing can reach more than 20 years. There is also a cold galvanizing treatment method, but the anti-rust performance of cold galvanizing is almost the same as that of spray painting and plastic spraying, and it is generally not recommended.
4. Black boiling process. The perforated mesh is heated in a high-concentration sodium hydroxide solution and forms a dense ferroferric oxide protective film under the catalytic action of sodium nitrite. This anti-rust method has the advantages of good curing effect of the generated film layer, good surface quality and good wear resistance.
2. Electrochemical protection method
Use the principle of galvanic cell to protect the perforated mesh and try to eliminate the galvanic cell reaction that causes electrochemical corrosion. Electrochemical protection methods are divided into two categories: anodic protection and cathodic protection. The most widely used is the cathodic protection method. The protected perforated mesh is used as the cathode of the corrosion cell to prevent it from being corroded, so it is also called cathodic protection method.
There are mainly two types of this method:
1. Sacrificial anode protection method: This method is to connect active metals (such as zinc or zinc alloys) to the protected perforated mesh. When electrochemical corrosion occurs, this active metal acts as a negative electrode to undergo oxidation reaction, thereby reducing or preventing the corrosion of the protected perforated mesh. This method is often used to protect perforated meshes that work in water for a long time to prevent corrosion of the perforated mesh.
2. Impressed current protection method: Connect the protected perforated mesh to the negative pole of the power supply, and select another conductive inert material to connect to the positive pole of the power supply. After the power is turned on, the metal surface will accumulate negative charges (electrons), thus inhibiting the metal from losing electrons and achieving the purpose of protection. This method is mainly used to prevent the perforated mesh in soil, seawater and river water from being corroded.
Another method of electrochemical protection is called anodic protection, which is the process of passivating the anode within a certain potential range by applying an external voltage. It can effectively block or prevent the perforated mesh from corroding in acids, alkalis and salts.
3. Treat the corrosive medium
Eliminate the corrosive medium: such as frequently wiping the perforated mesh, applying a desiccant on the surface of the perforated mesh, and adding a small amount of corrosion inhibitor to the corrosive medium to slow down the corrosion rate.
4. Change the material of the iron plate perforated mesh
Using stainless steel plates, aluminum plates, nickel plates or chromium plates that are stronger than iron plates for production can effectively prevent corrosion.
Post time: Sep-03-2024