Journal
PROGRESS IN ORGANIC COATINGS
Volume 71, Issue 3, Pages 302-309Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.porgcoat.2011.03.023
Keywords
Mg alloy; Organic coating; Corrosion resistance; Tungstate inhibitor
Funding
- Central University [HEUCF101010]
- Education Department of Heilongjiang Province [11553044]
- China Postdoctoral Science Foundation [AUGA41309003]
- Special Innovation Talents of Harbin Science and Technology [2010RFXXG007]
- foundation of Harbin Engineering University [HEUFT07053]
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Mg-Al layered double hydroxides, loaded with tungstate anions, were synthesized via the co-precipitation method. The obtained compounds were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy/energy-dispersive X-ray spectroscopy (SEM/EDS), inductively coupled plasma (ICP), and transmission electron microscopy (TEM), respectively. The ICP results demonstrated the partial anion-exchange process, involving the release of tungstate anions from layered double hydroxide by the chloride anions. Polarization measurements showed that the filtrate as electrolyte possessed a low corrosion current density value of 3.042 mu A/cm(2). The electrochemical impedance spectroscopy (EIS) exhibited that the coating could effectively protect the alloy from corrosion. The function of the layered double hydroxide loaded with tungstate doped in organic coating was also discussed. (C) 2011 Elsevier B.V. All rights reserved.
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