Abstract
In this study, nickel coating was electrodeposited on low carbon steel (LCS) surface. The effect of current density on surface morphology, crystal orientation and wettability of nickel coatings were comparatively studied. The abrasive resistance of coatings was carried out by self-made equipment. Moreover, the corrosion resistance of the surfaces was investigated by potentiodynamic polarization curves as well as electrochemical impedance spectroscopy (EIS) in the corrosive medium of 3.5wt.% NaCl solution. The results showed that the surfaces present a micro-nano structure at the current density of 6A/dm2 and 8A/dm2, and exhibit superhydrophobicity after modification with myristic acid. The crystal orientation changed with the variation of current densities. It is worth noting that the surface deposited at 6A/dm2 showed excellent mechanical stability after abraded by sandpaper for 10 times with interesting bouncing behavior. Moreover, electrochemical measurements showed that the corrosion potential (Ecorr) of superhydrophobic surface was ascended from −0.447V to −0.186V, and the EIS value was up to 1.04×105Ωcm2, indicating excellent corrosion resistance. The corrosion mechanism is illuminated via equivalent circuits.
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