Hello there,
No buffing will not damage passive film.
No buffing will not cause corrosion on later.
Please below ASTM A380 clause 1.1.1.1 (copy-pasted)
Passivation is the process by which a stainless steel will spontaneously form a chemically inactive surface when exposed to air or other oxygen-containing environments. It was at one time considered that an oxidizing treatment was necessary to establish this passive film, but it is now accepted that this film will form spontaneously in an oxygen-containing environment providing that the surface has been thoroughly cleaned or descaled.
Hope it helps.
Regards,
Jaydeep Limbasiya
QC Engineer (Nuclear)
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