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Home > Archive>Volume 49, Issue 12, 2020 >4236-4245. DOI:10.12442/j.issn.1002-185X.20200210
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Effect of anion exchange on self-healing properties of magnesium-aluminum LDHs film on the magnesium alloys
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College of Materials Science and Engineering,Taiyuan University of Technology

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    Abstract:

    In this paper, a layered double hydroxide film layer MgAl-LDHs-NO3 was synthesized by hydrothermal method. Tungstate anions (WO42-) and Cysteine(Cys) anions were intercalated into the LDHs interlayer by virtue of the anion exchange reaction to acquire MgAl-LDHs-WO4 and MgAl-LDHs-Cys films. X-ray diffraction (XRD), scanning electron microscope (SEM), Energy spectrometer (EDS), and electrochemical impedance test (EIS) were performed to study the morphology, structure, corrosion resistance and self-healing performance. The results showed that the corrosion resistance were in the sequence of LDHs-WO4＞LDHs-Cys＞LDHs-NO3.All of three film were of effectively self-healing ability. Electrochemical results showed that the films induced to the scratch treatment have better corrosion resistance after immersed in 3.5 wt.% NaCl solution for 8 days, and then showed a downward trend. .Compared to MgAl-LDHs, LDHs-WO4 and LDHs-Cys, contained corrosion inhibiting anions, were displayed the better self-healing ability, due to the film layer could not only capture Cl-, but also release corrosion-inhibiting anions.

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[Sun Junli, Li Siyuan, Xu Hengxu, Hou Lifeng, Du Huayun, Liu Baosheng, Wei Yyinghui. Effect of anion exchange on self-healing properties of magnesium-aluminum LDHs film on the magnesium alloys[J]. Rare Metal Materials and Engineering,2020,49(12):4236~4245.]
DOI：10.12442/j. issn.1002-185X.20200210

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History
  • Received:March 28,2020
  • Revised:May 08,2020
  • Adopted:May 27,2020
  • Online: January 13,2021

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