Question

During the electrochemical machining (ECM) of iron (Atomic weight = 56, valency = 2) at current of 1000 A with 90% current efficiency the material removal rate was observed to be 0.26 cc/s. If Titanium (atomic weight = 48, valency = 3) is machined by the ECM process at the current of 2000 A with 90% current efficiency, the expected material removal rate in gm/s will be

• A. 0.11
• B. 0.23
• C. 0.30
• D. 0.52

Answer 1

The correct option is C 0.30

$MRR=\frac{AI}{\rho ZF}$

$0.26=\frac{56\times 1000\times 0.9}{\rho \times 2\times 96500}$

$\rho =0.9956$

$\text{Now, Expected MRR}=\frac{48\times 2000\times 0.9}{0.9956\times 3\times 96500}$

= 0.30 gm/s