In order to improve the corrosion resistance of X100 pipeline steel in oilfield produced water, a Ni-WS2 coating was prepared by electroplating on the surface of X100 steel. The electrochemical performance of coatings was investigated after being soaked in the corrosion solution at 60 ℃ and 0.6 m/s for 24 hours. The microstructure before and after corrosion as well as the thickness of the coating were observed by scanning electron microscope (SEM). Meantime, the phase composition of the coating before and after corrosion was analyzed by X-ray diffractometer (XRD), and the corrosion resistance of the coating was evaluated by potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS). Results showed that the corrosion products of the Ni-WS2 coating were composed of Fe3C and FeOOH. Compared with the X100 substrate, the Ni-WS2 coating had more positive corrosion potential, higher impedance value and lower corrosion current density. The morphology after corrosion also indicated that the corrosion degree of the coating was relatively light and remained dense. Therefore, the Ni-WS2 coating on X100 pipeline steel could greatly improve the corrosion resistance of X100 pipeline steel.
