Abstract
In this work, a facile and efficient method to overcome the poor dispersion of carbon nanotubes (CNTs) in the polymer matrix by in-situ synthetizing ZnS nanoparticles onto their surfaces was developed. The as-prepared CNTs/ZnS hybrid was then used as lubricating additive to enhance the friction-reducing and anti-wear properties of epoxy (EP) coatings. The microstructure and composition of CNTs/ZnS were characterized using HRTEM, FESEM, XRD, and RS. The ZnS nanoparticles with the size of about 20–30 nm were coated onto CNTs surface homogeneously in the form of wurtzite structure phase. Besides, the enhancement mechanisms of CNTs/ZnS on the tribological properties of EP coating were studied systematically. The results revealed that as the content of CNTs/ZnS was 1.25 wt%, the corresponding coatings possessed the lowest friction coefficient and highest wear resistance. Moreover, the EP coatings with the different weight fraction of CNTs/ZnS hybrid showed much better tribological properties than those with CNTs or acid-CNTs. The excellent tribological properties were mainly related to good dispersion of CNTs or ZnS as well as good synergism between CNTs and ZnS.
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