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Pickle/Passivate
Pickling is used as part of the acid cleaning process.  This part of the process conditions the surface of the metal and loosens scale for easier removal.
Passivation creates a surface to eliminate contamination and prevent rust. Alloys Cleaning uses this process on stainless steel parts and castings, but not for steel.

Note:  Contact with iron-based tooling after this process can cause the surface to rust.