Effect of current waveform on structure and properties of electroplated iron coating

The effects of current waveform and current density on the deposition rate,appearance,microhardness and surface morphology of Fe coating electroplated from a stable bath containing FeCl2 400 g/L,ascorbic acid 3.2 g/L,glycine 2 g/L and fluoroboric acid 6.4 mL/L on steel substrate were studied. Single pulse current is the most suitable waveform for repairing parts. The Fe coating prepared with single pulse current at pulse on-time 0.1 ms,period 1 ms,working time 100 ms,intermittent time 900 ms and average current density 5.5 A/dm2 features fine microcrystalline structure with irregular micro-cracks,microhardness 679 HV,and similar deposition rate as the Fe coating prepared with direct current.