Journal
CORROSION SCIENCE
Volume 208, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2022.110629
Keywords
HVAF spraying; Fe-based coating; Carbon nanotube; Corrosion resistance
Funding
- National Natural Science Foundation of China [51901079]
- Fundamental Research Funds for the Central Universities
- Opening Project of National Engineering Research Center for Powder Metallurgy of Titanium Rare Metals
- Natural Science Foundation of Guangdong Province [2018A030313615, 2018A030310406, 2020A1515010736]
- Guangzhou Municipal Science and Technology Program [202007020008]
- Zhongshan Municipal Science and Technology Program (Platform Construction and innovation Team) [2016F2FC0005]
- Zhongshan Collaborative Innovation Fund [2018C1001]
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Fe-based composite coatings doped with TiB2 and CNTs were fabricated successfully, showing improved corrosion resistance and microstructure.
Fe-based composite coating doped well-dispersed titanium boride (TiB2) and carbon nanotubes (CNTs) were successfully fabricated via high velocity air fuel (HVAF) spraying. The microstructure and corrosion behavior of Fe-based metallic, Fe-TiB2 cermet and Fe/(TiB2-CNTs) coatings were comparatively investigated. It is found that doping TiB2, especially further doping 2.5 vol% CNTs could remarkably render the coatings lower porosity, favorable microstructure, superior hydrophobicity and then enhanced corrosion resistance. Thanks to the densest microstructure and the formation of passive films, pitting instead of severe etch groove in TiB2-Fe interface inside splats and inter-splats was the main corrosion mechanism of the Fe/(TiB2-CNTs) coating.
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