Summary Of Common Problems In Electropolishing

DALIAN, China - Oct. 10, 2022 - PRLog -- Electrolytic polishing uses the workpiece to be polished as the anode, insoluble metal as the cathode, and both poles are immersed into the electrolytic cell at the same time. Through DC ionization reaction, selective anode dissolution is generated, so as to remove fine burrs on the workpiece surface and increase the brightness.

1. Why are there grey and black patches on the polished surface?

Cause analysis: the oxide skin may not be completely removed. Oxide scale still exists locally.

Solution: strengthen the removal of oxide scale

2. What is the cause of the excessive corrosion at the corners and tips of the workpiece after polishing?

Cause analysis: excessive dissolution is caused by excessive current at edges, corners and tips, or excessive electrolyte temperature and polishing time.

Solution: adjust the current density or solution temperature, or shorten the time. Check the electrode position, and set shielding at the edges and corners.

3. Why is the workpiece not bright and grey and dark after polishing?

Analysis reason: it is possible that the electrochemical polishing solution has no effect or the effect is not obvious.

Solution: check whether the electrolytic polishing solution has been used for too long, the quality has decreased, or the proportion of solution components is out of proportion.

4. What is the white stripe on the polished surface of the workpiece?

Cause analysis: the relative density of the solution is too large and the liquid is too thick. The relative density is greater than 1.82.

Solution: increase the stirring degree of the solution. If the relative density of the solution is too large, dilute it to 1.72 with water. And heated at 90 ~ 100 ℃ for one hour.

5. Why are there Yin and Yang surfaces on the polished surface, and some parts are dull?

Cause analysis: the position of the workpiece is not aligned with the cathode, or the workpiece is shielded from each other.

Solution: properly adjust the workpiece to make the position between the workpiece and the cathode appropriate and make the power distribution reasonable.

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