Nickel, Nickel-Cobalt and Nickel/Nickel Cobalt duplex coating prepared by two-step electrodeposition method. Surface morphology and preferred orientation of the coatings were characterized by scanning electron microscopy (SEM) and X-ray diffractometer (XRD), respectively. The SEM result showed that single and duplex micro- nano hierarchial structures can be achieved via electrodeposition. XRD results showed that all of coating have (111) preferred grain orientation that cause by presence of ammonium chloride as crystal modifier in bath composition. According of the "Screw dislocation driven growth" and "Metal ion deficient layer theory" in the presence of ammonium chloride in electrodeposition bath Nickel and Nickel-Cobalt deposit have cone and flower-like morphology, respectively. Any pick of phases containing Cobalt in the diffraction pattern of alloy coating were not observed. Energy dispersive X-ray spectroscopy analysis was used for Cobalt content determination. For alloy coating with first deposition in Nickel bath and second deposition in Nickel-Cobalt bath Cobalt content increased with increasing the deposition time of second step. While for the coating with first deposition in Nickel –Cobalt bath and second deposition in Nickel bath, Cobalt content of the coating decreased significantly. Wettability of the Coating was evaluated after deposition and after two week storage. Result showed that coatings were superhydrophile after deposition. This wetting behavior can be explained with Wenzel wetting model and hydrophilicity nature of the metals and oxides. According to this model roughening the surface of the hydrophile material increased the wettability of the surface. Contact angle measurement after two week showed that hydrophobicity of the surface can be achieved by storage coatings in atmosphere due to airborne hydrocarbons adsorption. Average roughness of coating surface 0.4 µm measured by line profile roughness of the coating study. In addition shape of roughness and its distribution can be seen in line profile roughness. Erosion- corrosion behavior of the coating was evaluated by slurry erosion- corrosion test in 3.5%w NaCl solution + 40%w SiO 2 with 45µm size and 500 rpm rotating velocity. Compared with static condition, result showed that in turbulence condition corrosion resistance of the coating increased due to reducing roughness and penetration on corrosive agent. SEM result after erosion- corrosion test confirmed roughness reduction during test condition. Although surface of the coating still remained rough and hydrophobicity can be achieved with storage. Raman spectroscopy results indicated that Nickel oxided formed during erosion- corrosion test. Since, Corrosion behavior of the Nickel Oxide is better than Nickel, oxide formation cand icreased the polarization resistanse during erosion- corrosion test.