What Happens if the Passive Film of Stainless Steel Wire Mesh is Destroyed?
Jan. 21, 2021
As an Epoxy Coated Mesh Supplier, share it with you.
Stainless steel has good corrosion resistance, high temperature oxidation resistance, better low temperature performance and excellent mechanical properties. Therefore, it is widely used in sieving and filtering under acid and alkali environmental conditions, chemical packing, petroleum screen and other industries. Its main purpose is to prevent corrosion and rust. The corrosion resistance of stainless steel wire mesh mainly depends on the surface passivation film. If the film is incomplete or defective, the stainless steel will still be corroded. In engineering, pickling and passivation treatment is usually carried out to make the corrosion resistance potential of stainless steel play a greater role.
In the process of forming, assembling, welding, welding seam inspection of stainless steel equipment and components, such as flaw detection, pressure test and construction marking, etc., surface oil stains, rust, non-metallic dirt, low melting point metal contaminants, paint, welding slag These substances affect the surface quality of stainless steel equipment and components, destroy the oxide film on the surface, and reduce the overall corrosion resistance and local corrosion resistance (including pitting and crevice corrosion) of the stainless steel wire mesh. Causes stress corrosion cracking. The surface cleaning, pickling and passivation of stainless steel wire mesh can not only maximize corrosion resistance, but also prevent product contamination and obtain beautiful appearance.
The surface of containers made of stainless steel wire mesh and composite steel plates with anti-corrosion requirements should be pickled and passivated. This requirement is for filtration used in petrochemical industries, because these equipment are used in direct contact with corrosive media. From the perspective of ensuring corrosion resistance, pickling passivation is necessary. For other industries, if it is not for the purpose of anti-corrosion, it is only based on the requirements of cleanliness and beauty, and the stainless steel material does not need to be pickled and passivated. However, the welds of stainless steel equipment also need to be pickled and passivated, and the passive film of stainless steel wire mesh is repaired to improve the corrosion resistance.
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