Pickling after the construction phase:
• Provides complete removal of oxide skin and impurities;
• Restores corrosion resistance and returns to the quality level of the original base material;
• Removes the naturally occurring chromium oxide skin and activates the surface.
Passivation is a processing technique, which usually follows after pickling and rinsing, with the surface provided with a passive coating. The actual passivation takes place in stainless steel by treatment in a nitric acid bath, thus returning the passive state by restoring the layer of chromium oxide. Due to this treatment, the underlying metal gets its original corrosion protection back.
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