Cailiao Baohu (Mar 2023)

Application of Supercritical Technology in Pulse Composite Nickel Plating of Graphene Quantum Dots

  • LI Zhi-xian, LEI Wei-ning, FANG Cong, CHEN Ning, DUAN Shao-lan

DOI
https://doi.org/10.16577/j.issn.1001-1560.2023.0064
Journal volume & issue
Vol. 56, no. 3
pp. 91 – 97

Abstract

Read online

In order to adapt to the current rapid development of aerospace,automotive,and high-end equipment manufacturing industries,using graphene quantum dots (GQDs) with unique properties as the second phase additive,Ni-based nanocomposite coatings were prepared by supercritical pulse electrodeposition technology.The effect of pulse frequency on the microstructure,corrosion resistance,microhardness,wear resistance and other properties of composite coatings under supercritical conditions was investigated.Results showed that when the pulse frequency was 2 000 Hz under supercritical conditions,the microstructure of the prepared coating was densified and uniform,with better sphericity.XRD results showed that supercritical conditions could change the preferred orientation of crystallization and the appropriate pulse frequency could refine the coating grains and reduce the grain size.At a pulse frequency of 2 000 Hz under supercritical conditions,the properties of the prepared coating were more excellent.Electrochemical experiments showed that it had the largest capacitive arc radius,the highest self-corrosion potential,the lowest corrosion current density,and the largest capacitive modulus,so the coating had the most excellent corrosion resistance.The coating prepared at 2 000 Hz pulse frequency had the highest microhardness,reaching 835.4 HV2 N,and had the best wear resistance with a wear scar cross-sectional area of the coating of 1 582 μm2.The microhardness and wear scar cross-sectional area were 126%,107%,121%and 134%,and 47.6%,57.1%,71.5%and 44.3%of the coatings prepared with pulse frequencies of 100,1 000,3 000 Hz and under room temperature and pressure,respectively.Under supercritical conditions,the graphene quantum dot composite coating prepared at a pulse frequency of 2 000 Hz had excellent corrosion resistance and wear resistance.

Keywords