Which material is used to remove corrosion from highly stressed steel surfaces?

• A. Silicon carbide
• B. Fine grit aluminum oxide
• C. Aluminum oxide paste
• D. Garnet abrasive

Answer: (B)

Removing corrosion from highly stressed steel surfaces requires an abrasive that cleans effectively without creating surface defects that can become crack initiation sites. Fine grit aluminum oxide provides a controlled, uniform removal of corrosion while leaving a smooth enough finish to preserve the steel’s fatigue strength. It strikes a balance between aggressiveness and surface quality, making it well suited for this purpose. Silicon carbide, though very hard, tends to be more aggressive and can gouge or scratch delicate high‑strength steels, potentially introducing micro-cracks. Garnet is softer and cuts more slowly, so it isn’t as effective for removing corrosion on steel. Aluminum oxide paste is intended for polishing and fine finishing rather than removing heavier corrosion, so it wouldn’t be as efficient or controllable in this scenario.