Journal
CARBON
Volume 157, Issue -, Pages 537-548Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2019.09.013
Keywords
Magnesium; N-doped graphene quantum dots; Coating; Electrochemical deposition; Corrosion resistance
Funding
- National Natural Science Foundation of China [51771121, 51572173, 51602197, 51702212]
- Innovation Program of Shanghai Municipal Education Commission [2019-01-07-00-07-E00015]
- Shanghai Academic/Technology Research Leader Program [19XD1422900]
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A composite coating of N-doped graphene quantum dots (N-GQDs)/polymethyltrimethoxysilane (PMTMS) is prepared on the surface of AZ91D magnesium alloy via electrodeposition and subsequent silane treatment. The microstructure of the N-GQDs/PMTMS composite coating is characterized by field emission scanning electron microscopy (FE-SEM), energy dispersive X-ray spectroscopy (EDS), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy. The corrosion resistance performance is investigated by electrochemical impedance spectroscopy (EIS) and immersion test in NaCl solution (3.5 wt%). The N-GQDs/PMTMS composite coating exhibits a significant enhancement of corrosion resistance due to the chemical bonding of N-GQDs coating with Mg substrate and PMTMS coating. The formation mechanisms and nature of the corrosion resistance of the N-GQDs/PMTMS coating are discussed. (C) 2019 Elsevier Ltd. All rights reserved.
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