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Electrolytic
Polishing Problem Solver |
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Trouble: The centre of the specimen is deeply etched.
Possible Cause: No polishing film at center of specimen.
Suggested Corrections:
1. Increase voltage
2. Decrease agitation
3. Use more viscous electrolyte
Trouble: Pitting and etching at edge of specimen.
Possible Cause: Too viscous or thick film.
Suggested Corrections:
1. Decrease voltage
2. Increase agiation
3. Use less viscous electrolyte
Trouble: Deposits on surface.
Possible Cause: Insoluble products on anode.
Suggested Corrections:
1. Try new electrolyte
2. Increase temperature
3. Increase voltage
Trouble: Roughness or matte surface.
Possible Cause: Insufficient or no polishing.
Suggested Corrections:
1. Increase voltage
2. Use more viscous electrolyte
Trouble: Waviness or streaks on polished surface
Possible Cause:
1. Insufficient time
2. Incorrect agitation
3. Inadequate preparation
4. Time too long
Suggested Corrections:
1. Increase or decrease agitation
2. Improve the preparation
3. Increase voltage and decrease time
Trouble: Stains on polished surface.
Possible Cause: Attack after polishing is off.
Suggested Corrections:
1. Remove specimen while current is still on.
2. Try less corrosive eleclrolyte
Trouble: Unpolished spots (bullseyes).
Possible Cause: Gas bubles.
Suggested Corrections:
1. Increase agitation
2. Decrease voltage
Trouble: Phases in relief.
Possible Cause: Insufficient polishing film.
Suggested Corrections:
1. Increase voltage
2. Improve preparation
3. Decrease time
Trouble: Pitting.
Possible Cause:
1. Time too long
2. Voltage too high
Suggested Corrections:
1. Improve preparation
2. Decrease voltage
3. Decrease time
4. Try different electrolyte
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