stainless steel wire mesh
surface cleaning, pickling and passivation, in addition to maximize the corrosion resistance of stainless steel wire mesh, as well as to prevent product contamination and get a beautiful role. In GBl50 a 1998 "steel pressure vessel" provides that "the requirements of corrosion-resistant stainless steel and composite steel plate made of the surface of the container should be pickled passivation."
The necessity of pickling passivation of stainless steel wire mesh
Stainless steel wire mesh has good corrosion resistance, high temperature oxidation resistance, good low temperature performance and excellent mechanical and added r energy. So widely used in chemical, oil, power, nuclear engineering, aerospace, marine, medicine, light industry, textile and other departments. Its main purpose is to rust and rust. Stainless steel corrosion-resistant mainly rely on surface passivation film, if the membrane is incomplete or defective, stainless steel wire mesh will be corroded. Engineering is usually carried out pickling passivation treatment, so that the corrosion resistance of stainless steel to play even greater. In the process of forming, assembling, welding, weld inspection (such as flaw detection, pressure test) and construction marking, stainless steel equipment and components bring surface oil, rust, non-metallic dirt, low melting metal contaminants, paint, Slag and splash, etc. These materials affect the surface quality of stainless steel wire mesh equipment and components, destroy the oxide film on its surface, reduce the overall corrosion resistance and resistance to local corrosion (including pitting, crevice corrosion) Will lead to stress corrosion cracking.
Stainless steel mesh surface cleaning, pickling and passivation, in addition to maximize the increase in corrosion resistance, but also to prevent product contamination and get a beautiful role. In GBl50 a 1998 "steel pressure vessel" provides that the surface of the container made of stainless steel and composite steel plates with corrosion requirements should be subjected to pickling passivation. "This provision is for pressure vessels used in petrochemicals because These devices are used for direct contact with the corrosive media, from the corrosion and corrosion resistance to ensure that pickling passivation is necessary.For other industrial sectors, such as not for the purpose of corrosion, only based on clean and beautiful requirements, And the use of stainless steel is no need to pickling passivation, but the welding of stainless steel equipment also need to pickling passivation of nuclear engineering, some chemical plants and other use of strict requirements, in addition to pickling passivation , But also the use of high-purity medium for the final fine cleaning or mechanical, chemical and electrolytic polishing and other finishing.