67 / 2021-06-30 11:37:48

Preparation and Analysis of Ni-MoS2-Al2O3 Super-hydrophobic Composite Coating by Electro-deposition

composite coating, electro-deposition, super-hydrophobic

Obtaining super-hydrophobic coating on the surface of workpiece is a novel method in the field of corrosion protection. Super-hydrophobic coating has excellent properties including with self-cleaning, oil-water separation and high corrosion resistance. The common electro-deposition method has attracted more attentions because of its advantages in preparation of super-hydrophobic coating, such as simple process, low equipment cost, easy operation, high repeatability and being able to obtain surfaces with various nanometer size structures by changing processing parameters. In this research, Ni-MoS₂-Al₂O₃ super-hydrophobic composite coating was obtained by adding MoS₂ and Al₂O₃ micro powders to the plating baths which were dispersed by magnetic stirring and ultrasonic vibration as the nickel plating was carried out on the anode workpiece. The single factor experiments were carried out to determine the optimal process parameters. The effects of deposition time，bath temperature，current density，MoS₂ and Al₂O₃ particle size，MoS2 particle content and Al₂O₃ particle content on the surface morphology and properties of the composite coating were studied by single factor experiments. The super-hydrophobic Ni-MoS₂-Al₂O₃ composite coating with hardness of 547.1 HV and contact angle of 159.6 degree was gotten. The experiment results show that with the increase of MoS₂ concentration, the hardness of the coating decreased sharply. The hardness of the composite coating can be improved when SiC particles are added, and the contact angle of the composite coating can be increased when MoS2 particles are added to the bath.