Question 15 · LDEK · Dental laboratory technology
Indicate the true statements concerning electrolytic polishing:
1) process of electrolytic polishing is effective at roughness of 1.0 - 3.0 µm;
2) process of electrolytic polishing is effective at roughness of 3.0 - 6.0 µm;
3) during electrolytic polishing, the polished object is submerged in an electrolyte bath of ethylene glycol, sulphuric acid and hydrochloric acid;
4) during electrolytic polishing, the polished object is connected to the anode;
5) during electrolytic polishing, the polished object is connected to the cathode;
6) during electrolytic polishing both electrodes are submerged in an electrolyte bath, creating an electric circuit with alternating current.
The correct answer is:
2) process of electrolytic polishing is effective at roughness of 3.0 - 6.0 µm;
3) during electrolytic polishing, the polished object is submerged in an electrolyte bath of ethylene glycol, sulphuric acid and hydrochloric acid;
4) during electrolytic polishing, the polished object is connected to the anode;
5) during electrolytic polishing, the polished object is connected to the cathode;
6) during electrolytic polishing both electrodes are submerged in an electrolyte bath, creating an electric circuit with alternating current.
The correct answer is:
- A. 1,3,4,6.
- B. 1,3,4.
- C. 2,3,4,6.
- D. 2,3,5.
- E. 2,3,5,6.
Hint
Electropolishing is controlled anodic dissolution; recall which electrode the workpiece must be and what type of current electrolysis needs.
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