A novel Mg-rare earth （Nd, Ce） coating containing intermetallic compound was fabricated on the surface of the AZ91D magnesium alloy by bathing the sample in a NaC1-KC1-LiC1-NdC13-CeC13 molten salt. The cross-section...A novel Mg-rare earth （Nd, Ce） coating containing intermetallic compound was fabricated on the surface of the AZ91D magnesium alloy by bathing the sample in a NaC1-KC1-LiC1-NdC13-CeC13 molten salt. The cross-sectional morphology, microstructure and phase composition of the coating were investigated by scanning electron microscopy （SEM）, transmission electron microscopy （TEM） and energy dispersive spectroscopy （EDS）. The corrosion resistance was characterized by the potentiodynamic polariza- tion curves. The SEM observation indicated that a continuous and compact diffusion coating was obtained on the surface of SMATed AZ91D magnesium alloy and the XRD and TEM investigations revealed that the new phases were Al2Ce and A12Nd intermetallic. The potentiodynamic polarization curves showed that the Mg-RE coating improved the corrosion resistance of the AZ91D magnesium alloy, and the corrosion current density of the coated sample was about 1510 mA/cm2 lower than the uncoated sample.展开更多
基金National Natural Science Foundation of China(51331005,51171151,51464002)The Fund of the State Key Laboratory of Solidification Processing in NWPU(201408)
基金Project supported by the Key Science and Technology Project of the Ministry of Education(212093)the Ground Plan of Science and Technology Project of Jiangxi Province(KJLD2013078)
文摘A novel Mg-rare earth （Nd, Ce） coating containing intermetallic compound was fabricated on the surface of the AZ91D magnesium alloy by bathing the sample in a NaC1-KC1-LiC1-NdC13-CeC13 molten salt. The cross-sectional morphology, microstructure and phase composition of the coating were investigated by scanning electron microscopy （SEM）, transmission electron microscopy （TEM） and energy dispersive spectroscopy （EDS）. The corrosion resistance was characterized by the potentiodynamic polariza- tion curves. The SEM observation indicated that a continuous and compact diffusion coating was obtained on the surface of SMATed AZ91D magnesium alloy and the XRD and TEM investigations revealed that the new phases were Al2Ce and A12Nd intermetallic. The potentiodynamic polarization curves showed that the Mg-RE coating improved the corrosion resistance of the AZ91D magnesium alloy, and the corrosion current density of the coated sample was about 1510 mA/cm2 lower than the uncoated sample.
