材料科学
X射线光电子能谱
腐蚀
涂层
傅里叶变换红外光谱
盐雾试验
化学工程
介电谱
表面改性
石墨烯
微观结构
氧化物
镁合金
扫描电子显微镜
复合数
电化学
复合材料
冶金
纳米技术
物理化学
化学
工程类
电极
作者
Kai Yang,Pengxiang Zhang,Zhenzhen Feng,Yunfan Wang,Jian Peng,Bao-Wen Li
标识
DOI:10.1002/adem.202400223
摘要
Two‐dimensional (2D) materials have exhibited great potential for applications in anticorrosion nanocoatings. However, the nanocoating of prefocused graphene shows “corrosion‐promoting activity” due to its high conductivity. Metal oxide nanosheets obtained by chemically exfoliated layered oxides have been another attractive candidate. This study demonstrates a water‐based Ca 2 Nb 3 O 10 (CNO) ink spray‐coated on magnesium alloys to form a continuous coating without complex functionalization and structural control. The composite coating of Ca 2 Nb 3 O 10 (CNO) and polydopamine (PDA) is fabricated by combining spray and dip coating methods. The surface composition and microstructure of the as‐prepared coatings are characterized by X‐ray diffractometry (XRD), Fourier transform infrared (FTIR), X‐ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and energy dispersive spectrometry (EDS). The anti‐corrosion performance of the composite coating is evaluated by potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), and salt spray tests. The electrochemical results show that the CNO/PDA heterostructure coating provides an enhanced corrosion inhibition efficiency (99.62%) with a corrosion current density of 5.49×10 ‐7 A·cm ‐2 , three orders of magnitude lower than bare AZ31. The immersion tests before and after heat treatment and salt spray tests indicate that the composite coating has good stability and long‐term anticorrosion performance. Solution‐processed nanocoating and extensible materials design provide a green and facile route to anticorrosion nanotechnology for industrial demands. This article is protected by copyright. All rights reserved.
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