Medium grit aluminum oxide paper is used to remove corrosion on?

Question

BlackTom AI · Accepted Answer

Aluminum oxide is a commonly used abrasive for ferrous metals because it cuts efficiently without excessive loading; medium grit gives a balance between removal rate and surface finish. For highly stressed steel parts you must remove corrosion but avoid creating deep scratches or embedding abrasive particles that would act as fatigue crack starters. Therefore medium grit aluminum oxide paper is recommended for corrosion removal on highly stressed steel surfaces.

1) Relevant knowledge points and concepts
- Abrasive type: Aluminum oxide is well-suited to steel because it is hard and durable and produces controlled cutting action on ferrous metals.
- Grit size: “Medium grit” (commonly around 80–120 grit) removes corrosion and scale relatively quickly but does not gouge as aggressively as coarse grit.
- Stress concentration and fatigue: Surface scratches, embedded abrasive, or deep grooves act as stress risers and significantly reduce fatigue life of highly stressed components.
- Material compatibility: Soft metals, painted surfaces, composites and non-ferrous alloys require different abrasives or gentler methods.

2) Step-by-step reasoning
- Corrosion on steel needs mechanical removal to restore a sound surface.
- A very coarse abrasive would remove corrosion faster but could leave deep scratches that concentrate stress.
- A very fine abrasive may not remove corrosion effectively.
- Medium grit aluminum oxide achieves adequate removal while limiting scratch depth.
- Aluminum oxide is appropriate for steel specifically; it cuts steel effectively without embedding large hard particles that would exacerbate fatigue initiation.

3) Intermediate specifics (illustrative)
- Choose medium grit paper (≈80–120 grit).
- Work with light, controlled strokes to remove rust down to bright metal.
- Finish inspection should ensure no deep gouges remain; any sharp indentations must be smoothed.

4) Why the correct answer is correct
Highly stressed steel surfaces require corrosion removal methods that both clean and preserve fatigue life. Medium grit aluminum oxide paper removes corrosion while minimizing the depth and severity of scratches that would otherwise become stress concentrators.

5) Why other options are incorrect (brief)
- Soft/non-ferrous metals: Aluminum oxide can be too aggressive and cause gouging or smearing.
- Painted or finished surfaces: The abrasive will remove the coating rather than selectively remove corrosion.
- Composites/fiberglass: Different abrasives (often silicon carbide wet/dry) or methods are preferred.

6) Conclusion
The correct choice is Highly stressed steel surfaces, which matches the provided answer.

Medium grit aluminum oxide paper is used to remove corrosion on?单项选择题

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