Corrosion Performance of Composite MAO/TiO{sub 2} Sol–Gel Coatings on Magnesium Alloy AZ91D

Journal Article · Thu Nov 15 04:00:00 EST 2018 · Journal of Materials Engineering and Performance

DOI:https://doi.org/10.1007/S11665-018-3653-7· OSTI ID:22863210

Na, Zhang; Shengxue, Yu ^[1]; Qian, Xing ^[2]; Xiaolei, Chen; Mingxian, Zhang ^[3]; Dejiu, Shen ^[1]

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1. Yanshan University, State Key Laboratory of Metastable Materials Science and Technology (China)
2. Yanshan University, School of Mechanical Engineering (China)
3. Yanshan University, Hebei Key Laboratory of Applied Chemistry, School of Environmental and Chemical Engineering (China)

In this paper, the composite coatings on the surface of magnesium alloy were successfully prepared by the combination of micro-arc oxidation (MAO) and sol–gel method. Oxide ceramic layers were formed on AZ91D magnesium alloy using MAO process. The sol–gel layers were coated on MAO ceramic layers. The composition of the composite coatings was analyzed by x-ray diffraction and x-ray photoelectron spectroscopy. The microstructure of the composite coatings was analyzed by scanning electron microscope. The results show that the composite coatings can reduce the gap membrane effectively. The polarization curves and electrochemical impedance spectroscopy were used to evaluate the corrosion resistance. The results of corrosion tests show that the sol–gel layer enhances the corrosion resistance of the magnesium alloys significantly.

• OSTI ID: 22863210
• Journal Information: Journal of Materials Engineering and Performance, Journal Name: Journal of Materials Engineering and Performance Journal Issue: 11 Vol. 27; ISSN 1059-9495; ISSN JMEPEG
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CERAMICS
COATINGS
COMPOSITE MATERIALS
CORROSION RESISTANCE
ELECTROCHEMISTRY
IMPEDANCE
LAYERS
MAGNESIUM ALLOYS
MEMBRANES
MICROSTRUCTURE
POLARIZATION
SCANNING ELECTRON MICROSCOPY
SOL-GEL PROCESS
SURFACES
TITANIUM OXIDES
X-RAY DIFFRACTION
X-RAY PHOTOELECTRON SPECTROSCOPY