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Cobalt coatings were electrodeposited at different deposition current densities (10 mA·cm −2 , 20 mA·cm −2 , 30 mA·cm −2 , 40 mA·cm −2 , 60 mA·cm −2 ) over mild steel substrate. The coating deposited at 30 mA·cm −2  showed the highest corrosion resistance (R p  = 7515Ω·cm 2 ) due to a higher fraction of Low energy grain boundary constitution (i.e. coincidence site lattices (CSLs) and low angle grain boundaries (LAGB)) and exhibited higher fraction of stabler Co 3 O 4  passive oxide layer. The coatings electrodeposited at 60 mAcm −2  exhibited lower corrosion resistance (R p  = 1304 Ω·cm 2 ) due to a higher fraction of high-angle grain boundaries and a higher fraction of relatively lesser stable Co(OH) 2.

Deposition current density-induced grain boundary engineering of electrodeposited cobalt coatings for enhanced electrochemical stability