Research on Corrosion Properties of L360 Steel with Electroless Ni-Cu-P Plating in H₂S Environment

76 μm coating was obtained by electroless Ni-Cu-P plating on L360 steel for 5 h.The samples were immersed in H₂S for 4 h, 24 h, 72 h, 120 h, 240 h, 720 h and 1440 h, respectively.The vickers hardness and contact angle of the coating were measured by microhardness tester and optical contact angle tester respectively.The weight of the samples were measured by a precision balance and the corrosion rates were calculated.The surface and cross-section morphology of the coating were analyzed by scanning electron microscope and optical microscope. The results show that after Ni-Cu-P coating is plated on L360 steel, the Vickers hardness increases from 190.25 HV to 549.78 HV, the contact angle increases from 95.7°to 113.47°,which can improve the hydrophobicity.The corrosion rate decreases from 0.06 mg·cm^-2·h^-1 to 0.01 mg·cm^-2·h^-1, which can improve the corrosion resistance after soaking for 1440 h.