Which mechanical removal technique is used to remove light corrosion not deeply pitted into metal?

Which mechanical removal technique is used to remove light corrosion not deeply pitted into metal?

• A. Buffing
• B. Polishing
• C. Grinding
• D. Sanding

Answer: (D)

Light surface corrosion that isn’t deeply pitted can be removed with sanding. Sanding uses abrasive paper or belts to remove a thin outer layer of material along with the oxide, giving you control to remove the corrosion without digging into pits or removing excess metal. Grinding would be too aggressive and could remove too much material, potentially altering dimensions. Buffing and polishing are finishing steps focused on shine and surface smoothness and aren’t the best choice for lifting away corrosion layers. After sanding, you can finish with polishing if a smooth, shiny surface is desired.

Light surface corrosion that isn’t deeply pitted can be removed with sanding. Sanding uses abrasive paper or belts to remove a thin outer layer of material along with the oxide, giving you control to remove the corrosion without digging into pits or removing excess metal. Grinding would be too aggressive and could remove too much material, potentially altering dimensions. Buffing and polishing are finishing steps focused on shine and surface smoothness and aren’t the best choice for lifting away corrosion layers. After sanding, you can finish with polishing if a smooth, shiny surface is desired.