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The surface irregularities of electrodes used in an electrochemical machining (ECM) process are 3 μm and 6 μm as shown in the figure. If the work-piece is of pure iron and 12V DC is applied between the electrodes, the largest feed rate is mm/min. Conductivity of the 0.02 ohm–1 mm–1 electrolyte Over-potential voltage 1.5 V Density of iron 7860 kg/m3 Atomic weight of iron 55.85 gm Assume the iron to be dissolved as Fe+2 and the Faraday constant to be 96500 Coulomb.
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- 51.542 mm/min
- 52.542 mm/min
- 50.542 mm/min
- 49.542 mm/min
Correct Option: B
| R = | = | = | Area | Area | Area |
| I = | = | = 23.333 × Area | R | 50 × 0.009 |
L = 3 + 6 = 9 μm = 0.009
| MRR = | = | ρZF | 7860 × 10-6×96500 |
= 0.98189 × Area
| = 0.8590 mm/sec = 0.8590 × 60 mm/min | Area |
= 51.542 mm/min
