Abstract
Mg-14Li-1Al-0.1Ce alloy is immersed in NH 4 VO 3 + K 3 (Fe(CN) 6 ) solutions with different NH 4 VO 3 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 NH 4 VO 3 + 3.75 g L -1 K 3 (Fe(CN) 6 ) solution at 80 °C for 10 min. The coating consists of V 2 O 5 , Li 2 O and Mg(OH) 2 .
| Original language | English |
|---|---|
| Pages (from-to) | 59-67 |
| Number of pages | 9 |
| Journal | Applied Surface Science |
| Volume | 261 |
| DOIs | |
| State | Published - 15 Nov 2012 |
| Externally published | Yes |
Keywords
- Anticorrosion
- Electrochemical impedance spectroscopy
- Magnesium-lithium alloy
- Polarization technique
- Vanadate conversion coating
- X-ray photoelectron spectroscopy
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