Preparation of Ni coating on NdFeB by magnetic jet electrodeposition

Abstract

In order to lengthen the lifespan of NdFeB materials, nickel coating was manufactured by magnetic jet electrodeposition. The surface morphology, coating adhesion, and corrosion resistance of the coating were characterized and analyzed, respectively, by scanning electron microscope, scratch tester, and electrochemical workstation. The experimental results show that the surface of nickel coating which was fabricated by magnetic jet electrodeposition had no nodularity, and as a result, the surface morphology improved; furthermore, the corrosion resistance and coating adhesion of the coating improved in the effect of magnetic field intensity. When the value of the current density was 60 A/dm2 and the intensity of magnetic field was 100 mT, the coating adhesion could reach the standard in 33.4 N, which was doubled compared to the coating without magnetic field. Corrosion of the coating morphology is no longer the regional corrosion. Magnetic field is beneficial to improve the quality of coating surface morphology and reduce the corrosion current density of the coating.

Processing of silicon added Fe-Cr-Co hard magnetic alloy by two stage thermomagnetic treatment technique

“…Magnetic fields with varying intensities have been extensively utilized in several manufacturing processes to control and achieve requisite material characteristics. [21][22][23] In this work, the required magnetic field strength was estimated by initially using integral form theoretical formulae which were then confirmed by Finite Element Analysis (FEA) ANSYS Magnetostatic module, as shown in Figures 4 and 5. ANSYS Workbench 2019 Magnetostatic Module was used for analysis of double coil magnetic field fixture.…”

Nano mixed particles enhanced Nickel-Cobalt composite coatings by scanning jet electrodeposition

“…41 Therefore, the surface flatness, uniformity and defects affected the corrosion resistance of the composite coating. 22 The surface flatness and uniformity of the Ni-Co alloy coating improved with the addition of nano-CeO 2 particles, so the corrosion resistance of Ni-Co-CeO 2 composite coating was better than that of Ni-Co alloy coating. 16 On one hand, nano-CeO 2 particles change the morphology of the composite coating, improve the surface flatness and uniformity, and reduce surface defects of the composite coating, which makes it difficult for the corrosion medium to penetrate the interior of the composite coating through the surface.…”

“…Therefore, it could be used for surface repair and remanufacturing of engineering materials, which has been widely reported in recent years. 22,23 Functional metal nanoparticles have unique thermal, electrical, and flame-retardant properties. 24 Recently, Ni-Co-CeO 2 composite coatings mainly focused on high-temperature oxidation resistance, microhardness and corrosion resistance.…”

Wear resistance of Ni-Co/SiC composite coating by jet electrodeposition in the presence of magnetic field

“…Table 2 indicates the surface roughness of the different coatings; the surface roughness of the Ni-Co alloy coating was up to 2.35 6 0.011 mm, and the surface roughness of the Ni-Co/SiC (2 g/L) composite coating was obviously reduced to 1.00 6 0.005 mm. 18,19 It was directly related to the growth of microprotrusions on the SEM morphology analyzed above. However, the surface roughness of the Ni-Co/SiC (6 g/L) composite coating increased to 1.26 6 0.006 mm as shown in Figure 3(c), which was related to a large amount of nano-SiC agglomeration and reduced the growth quality of the composite coating.…”