Volume 40 Issue 2
Feb.  2023
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LIU Fenjun, NING Xiang, BAI Yanxia, et al. Microstructure and corrosion properties of the laser cladding Al-TiC composite coating on AZ31 magnesium alloy[J]. Acta Materiae Compositae Sinica, 2023, 40(2): 959-969. doi: 10.13801/j.cnki.fhclxb.20220410.002
Citation: LIU Fenjun, NING Xiang, BAI Yanxia, et al. Microstructure and corrosion properties of the laser cladding Al-TiC composite coating on AZ31 magnesium alloy[J]. Acta Materiae Compositae Sinica, 2023, 40(2): 959-969. doi: 10.13801/j.cnki.fhclxb.20220410.002

Microstructure and corrosion properties of the laser cladding Al-TiC composite coating on AZ31 magnesium alloy

doi: 10.13801/j.cnki.fhclxb.20220410.002
Funds:  National Natural Science Foundation of China (51861034; 51974260); Technology Bureau of Yulin (CXY-2022-083; CXY-2020-006-01); Technology Bureau of Yulin High-tech Zone (CXY-2021-16); High-level Talent Project of Yulin University (20 GK06); Joint Fund of the Yulin University and the Dalian National Laboratory for Clean Energy (YLU-DNL Fund 2021008); Innovation Team of Education Department of Shaanxi Provincial Government (22JP105)
  • Received Date: 2022-02-11
  • Accepted Date: 2022-03-29
  • Rev Recd Date: 2022-03-28
  • Available Online: 2022-04-12
  • Publish Date: 2023-02-15
  • In order to enhance the surface corrosion resistance of the AZ31 magnesium alloy, the defect-free Al-TiC composite coatings were prepared on AZ31 magnesium alloy using laser cladding technology. The influences of Al-TiC compositions with different contents on the phase composition, microstructure and corrosion resistance of the Al-TiC composite coatings were investigated. The results indicate that a large number of Al12Mg17, Mg2Al3 and TiC phases are produced in the Al-TiC composite coating. The microstructure of the composite coating characterizes as a continuous network distribution. With the decrease of the Al content in the composite powder, the contents of the Al12Mg17, Mg2Al3 and TiC phases in the composite coating gradually increase, and the network-like distribution characteristics of the microstructure in the composite coating become more uniform and continuous. In addition, a sound metallurgical bonding interface is prepared between the composite coating and the AZ31 substrate. The corrosion resistance of the Al-TiC composite coating prepared using the laser cladding technology is significantly enhanced compared to that of the AZ31 substrate. The self-corrosion potential increased from −1.563 V of the AZ31 substrate to −1.144 V of the Al-TiC composite coating, whereas the self-corrosion current decreased from 1.55×10−4 A to 2.63×10−6 A.

     

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