Why does the Stainless Steel Screen Break or Turn Black?

Oct. 29, 2020

As an Epoxy Coated Mesh Supplier, I would like to share with you that corrosion is the main cause of the fracture of the stainless steel screen.

The corrosive medium is chloride ions in the humid atmosphere near the sea. The material of the broken wire mesh is poor, and its chemical composition does not meet the relevant technical conditions. The low content of chromium and nickel, and the high content of manganese all reduce the corrosion resistance of 1Crl8Ni9 steel. More dispersed carbide particles and ferrite in the structure greatly reduce the stress corrosion and pitting corrosion resistance of the mesh.

Industrial Filter Epoxy Mesh

Industrial Filter Epoxy Mesh

The stainless steel mesh is mainly an alloy of iron, nickel, and chromium. The three elements can be in different proportions.

At the same iron content, the high chromium content will be bright, the high nickel content will be dark, and the high iron content will be relatively dark. The content ratio cannot be judged by the brightness and darkness.

The black surface of the stainless steel screen is the result of the stainless steel wire being heated and oxidized.

During the drawing process of stainless steel wire, the lubrication of the wire drawing machine is not good, the friction resistance is large, and the surface of the stainless steel wire is heated seriously, which leads to segregation. The internal alloy composition is analyzed. It is very hard and not easy to handle. Lubricating oil should be used to effectively reduce the frictional resistance of stretching, so as not to form an extremely high temperature on the surface of the wire, and to realize the timely dispersion of heat. The speed of the wire drawing machine can also be appropriately reduced to avoid heating and oxidizing the stainless steel wire.

Reasons and treatment methods of stainless steel screen rust

The stainless steel screen is a special existence that is different from the general mesh products. It has a strict series of mesh sizes. What is the cause of the rust of the stainless steel screen? To

Reasons for rust of stainless steel screen:

1. The surface of stainless steel is stored with dust containing other metal elements or attachments of foreign metal particles. In humid air, the condensation between the attachments and stainless steel connects the two into a micro battery, triggering an electrochemical reaction , The protective film is damaged, which is called electrochemical corrosion.

2. The surface of stainless steel adheres to the organic juice (such as melon, vegetable, noodle soup, sputum, etc.), which forms organic acid in the presence of water and oxygen. The organic acid will corrode the metal surface for a long time.

3. The surface of stainless steel adheres to containing acid, alkali, and salt substances (such as alkaline water and lime water splashing on the decoration wall), causing local corrosion.

4. In polluted air (such as the atmosphere containing a large amount of sulfide, carbon oxide, and nitrogen oxide), when it encounters condensed water, it will form sulfuric acid, nitric acid, and acetic acid liquid spots, causing chemical corrosion.

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