材料科学
涂层
腐蚀
塔菲尔方程
介电谱
原电池
电偶腐蚀
冶金
X射线光电子能谱
化学工程
复合材料
电化学
化学
电极
工程类
物理化学
作者
Yanqiu Li,Yongzhong Ouyang,Rui Fang,Xiao Hui Jiang,Zhihui Xie,Liang Wu,Jilan Long,Chuan‐Jian Zhong
标识
DOI:10.1016/j.cej.2021.132776
摘要
To obtain high corrosion protection and break the bottleneck arising from galvanic corrosion between Ni layer and Mg alloy substrate, we report herein a triple-layer composite coating approach, consisting of Ni (ENP) underlayer, NiAl-layered double hydroxide (LDH) middle layer, and silane (PFDTMS) toplayer, i.e., ENP/LDH/PFDTMS. This nanocomposite coating was prepared on the Mg alloy surface by a combination of simple electroless plating, hydrothermal-assisted in situ growth, and condensation reaction. The surface morphology, structure, and chemical composition of the resulting composite coating are characterized using several techniques, including scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The corrosion protection performance of the composite coating in a saline solution is evaluated by electrochemical impedance spectroscopy (EIS), Tafel curve, and immersion measurements. The results indicated that the ENP/LDH/PFDTMS composite coating possesses a much higher corrosion resistance than the single Ni coating and the LDH-grown Ni (ENP/LDH) coating. In contrast to the severe galvanic corrosion the Mg alloy with single Ni coating observed in two days of exposure, the substrate with either ENP/LDH/PFDTMS coating or ENP/LDH coating is shown to exbibit no galvanic corrosion phenomenon even after 30 days of exposure. Moreover, the result from tests including contact angle measurement of the ENP/DLH/PFDTMS coating demonstrates the superhydrophobic function to several typical liquids in daily life and the good self-cleaning capability after contamination by graphite powder. These findings provide a fresh insight into the design of advanced coatings for inhibiting galvanic corrosion between Ni layer and Mg alloy.
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