Corrosion resistance enhancement of magnesium alloy by N-doped graphene quantum dots and polymethyltrimethoxysilane composite coating

被引：56
作者：
Jiang, B. K. [1 ]
Chen, A. Y. [1 ]
Gu, J. F. [2 ]
Fan, J. T. [3 ]
Liu, Y. [4 ]
Wang, P. [1 ]
Li, H. J. [1 ]
Sun, H. [1 ]
Yang, J. H. [1 ]
Wang, X. Y. [1 ]
机构：
[1] Univ Shanghai Sci & Technol, Sch Mat Sci & Engn, Shanghai 200093, Peoples R China
[2] Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Shanghai 200240, Peoples R China
[3] Beijing Inst Technol, State Key Lab Explos Sci & Technol, Beijing 100081, Peoples R China
[4] Nanchang Univ, Key Lab Near Net Forming Jiangxi Prov, Nanchang 330031, Jiangxi, Peoples R China
来源：
CARBON | 2020年 / 157卷 / 157期
基金：
中国国家自然科学基金;
关键词：
Magnesium; N-doped graphene quantum dots; Coating; Electrochemical deposition; Corrosion resistance; MG ALLOY; CERIUM OXIDE; PROTECTION; LAYER; ELECTRODEPOSITION; PERFORMANCE; INHIBITOR; MECHANISM; STEEL; FILM;
D O I：
10.1016/j.carbon.2019.09.013
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
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.
引用
收藏
页码：537 / 548
页数：12
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