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The last process step in chemical cleaning is a critical step, with the purpose of protecting the material against corrosion. Such as the boiler pickling, water rinse, rinse, the metal surface is very clean, very activated, it is vulnerable to corrosion, it must be immediately passivated to clean the metal surface to generate a protective film to reduce corrosion.
In the field of automatic control, there is a special name "channel passivation." If a fault is detected by the -> F-I / O in the fail-safe system (F-SYSTEM), the affected channel or all channels are switched to the safe state, ie the channel of the F-I / O is passivated.Steel Casting Parts Supplier