What method is used to remove corrosion off stainless steel?

• A. Chemical removal
• B. Wipe with a clean oily cloth
• C. Mechanical grinding
• D. Sandblasting

Answer: (B)

Light surface corrosion on stainless steel is best addressed with a gentle cleaning that doesn’t remove metal or damage the protective chromium oxide film. Wiping with a clean oily cloth effectively removes loose corrosion products and leaves a thin oil film. That oil creates a temporary protective barrier, reducing moisture and oxygen contact and slowing further corrosion, while preserving the passivated stainless surface.

Chemical removal would involve acids or cleaners that can attack the chromium oxide layer and require thorough rinsing and neutralizing. Mechanical grinding or sandblasting are more aggressive; they remove metal, alter surface finish, and can create new sites for corrosion. For light corrosion, the mild approach of an oily wipe keeps the surface intact and protected, reserving more aggressive techniques for heavier corrosion cases.