Synthesis of Ni/nano-Al 2 O 3 coatings by brush plating with magnetic fields

Abstract

In the process of electrodeposition, the magnetic field would generate the magneto hydrodynamic (MHD) effect, which affects the flow and mass transfer of hydrogen evolution. Thus, the performance of electrodeposition coatings will be affected. In this work, Ni/nano-Al 2 O 3 coatings prepared by brush plating with magnetic fields were studied. The results show that the magnetic field indeed influences the morphology, texture and wears resistance. The morphology of Ni/Al 2 O 3 coating is smooth and uniform; the (200) plane of Ni/Al 2 O 3 coating is preferentially oriented in the same direction of a magnetic field; the wear resistance of Ni/Al 2 O 3 composite coatings increases due to the uniform distribution of Al 2 O 3 particles; and the wear mechanism of coating belongs to adhesive wear. The optimal intensity of magnetic field for Ni/Al 2 O 3 composite coatings to obtain a good performance is 0.1 T.