期刊
APPLIED SURFACE SCIENCE
卷 261, 期 -, 页码 59-67出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2012.07.069
关键词
Magnesium-lithium alloy; Vanadate conversion coating; Anticorrosion; Polarization technique; Electrochemical impedance spectroscopy; X-ray photoelectron spectroscopy
类别
资金
- Key Laboratory of Superlight Material, Surface Technology of Ministry of Education, Harbin Engineering University
Mg-14Li-1Al-0.1Ce alloy is immersed in NH4VO3 + K-3(Fe(CN)(6)) solutions with different NH4VO3 and/or K-3(Fe(CN)(6)) concentrations, and different immersion time. The surface morphology and composition of the vanadate coating are then characterized by scanning electron microscopy with energy dispersion spectroscopy (SEM-EDS) and X-ray photoelectron spectroscopy (XPS), and the corrosion behavior of the conversion coating is studied by polarization technique and electrochemical impedance spectroscopy (EIS). The experimental results indicate that the vanadate film with better corrosion resistance forms on Mg-Li-Al-Ce surface after the sample is immersed in 30 g L-1 NH4VO3 + 3.75 g L-1 K-3(Fe(CN)(6)) solution at 80 degrees C for 10 min. The coating consists of V2O5, Li2O and Mg(OH)(2). (C) 2012 Published by Elsevier B.V.
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