Fig. 2. (a) Covered surface ratio of 5 mm-long Mg wires as a function of electrolysis time at different applied ε: 0.5 V cm⁻¹ (black dots), 1 V cm⁻¹ (blue dots) and 2 V cm⁻¹ (red dots). Inset: optical pictures of the asymmetric deposits of electrophoretic paint (EP) using an ε of 0.5 V cm⁻¹ (black frames) and 2 V cm⁻¹ (red frames) for 10 and 120 min, respectively. Optical pictures of Mg particles after asymmetrical modification in an electrophoretic paint/water solution (1 : 10) at different ε values and deposition times; (b) 4 V cm⁻¹, 20 min, (c) 6 V cm⁻¹, 20 min, (d) 6 V cm⁻¹, 10 min and (e) 6 V cm⁻¹, 5 min.