Electrolytic Polishing Problem Solver

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

Copyright © 2017 by Steel Data. All Rights Reserved.