Austenitic stainless steel has good corrosion resistance, high temperature oxidation resistance, good low temperature performance and good mechanical and processing properties. Therefore widely used in chemical, petroleum, power, nuclear engineering, aerospace, marine, pharmaceutical, light industry, textile and other sectors. Its main purpose is a corrosion preventive. Rely mainly on surface passivation film of stainless steel corrosion-resistant, if the film is incomplete or defective, the stainless steel will continue to be corrosion. The project usually pickling passivation of stainless steel corrosion potential was greater. In forming of stainless steel equipment and components, assembly, welding, weld inspection (such as the process of flaw detection, pressure test) and construction of marking a surface of oil, rust, non-metal dirt, the low melting point metal contaminants, paints, welding slag and spatter, these substances affect the stainless steel equipment and components used in surface quality, destruction of the surface oxide film, reducing the resistance to overall corrosion of steel and resistance to localized corrosion (pitting, crevice corrosion), and even lead stress corrosion cracking.
Stainless steel surface cleaning, pickling and passivation, in addition to maximize corrosion resistance, but to prevent product contamination and beautiful role. In GBl50 a 1998 steel pressure vessel regulations, anti-corrosion requirements of stainless steel and composite steel plate surface of the container should be carried out pickling passivation ".
This provision is in terms of pressure vessels for petrochemical, because these devices are used for occasions of direct contact with the corrosive medium, corrosion resistance to ensure that corrosion is proposed that acid passivation is necessary. Other industrial sectors, such as not out of a preservative, based only on the cleanliness and appearance requirements, and you do not need stainless steel pickling passivation. But also need to weld on stainless steel equipment, pickling passivation. Nuclear engineering, some of the chemical plant and other uses demanding, acid passivation, but also the medium of high-purity final fine cleaning or finishing processing machinery, chemical and electrolytic polishing.
Other News:
The necessity of austenitic stainless steel pickling passivation
Strong typhoon raid has caused many fallen trees and other accidents is at least
Angular contact ball bearing seal technology precautionary approach to noise
Steel prices plunged more than the market undermined confidence
How best to extend the ntn roller bearing service life
Steel prices to new lows to buy the dips still cautious
Inner ring fixed on the FAG bearing temperature
Multi-factor constraints steel mills prefer to drop in steel prices is not cut
