A rectangular cross sectional strip of aluminum, 10 mm x 50 mm, is to be electroplated with iron on both sides only to a thickness of 100 mm.

A rectangular cross sectional strip of aluminum, 10 mm x 50 mm, is to be electroplated with iron on both sides only to a thickness of 100 mm.  This is achieved using a cathode current density of 5 A dm-2 and a cathode efficiency of 90 %. Calculate the plating time, given: atomic wt. of Fe: 56, Al: 27 and density of  Fe: 7800 kg m-3 , Al : 2600 kg m-3. Ignore the edges. [5 points].

Thanks!