4.7 Article

A self-healing coating based on facile pH-responsive nanocontainers for corrosion protection of magnesium alloy

Journal

JOURNAL OF MAGNESIUM AND ALLOYS
Volume 10, Issue 3, Pages 836-849

Publisher

KEAI PUBLISHING LTD
DOI: 10.1016/j.jma.2020.11.007

Keywords

Mg alloy; Coating; Corrosion; Layered double hydroxide; Nanocontainer

Funding

  1. Sichuan Science and Technology Program [2018JY0483]
  2. Young Elite Scientists Sponsorship Program by China Association for Science and Technology [2018QNRC001]
  3. Natural Science Foundation of Hunan Province [2020JJ4073]
  4. Open Project of Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province [CSPC202004]
  5. Foundation of Huaihua University Double First-rate Applied Characteristic Discipline Construction Projects of Materials Science and Engineering [19CKA002]
  6. Fundamental Research Funds of China West Normal University [CXTD2020-1]
  7. National Science Foundation [CHE 1566283]

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This study demonstrates a new strategy for constructing pH-responsive nanocontainers and successfully applying them to corrosion protection of magnesium alloy. A smart corrosion protection system was achieved by incorporating the synthesized nanocontainers into a self-assembled nanophase particle coating. Electrochemical tests and visual observations showed that the hybrid coating exhibited the best barrier properties and corrosion resistance.
The preparation of pH-responsive nanocontainers by typical silane modification of the mesoporous silica nanoparticle (MSN) surface is usually high-cost, complex, and time-consuming, which remains a great challenge for effective corrosion protection of magnesium alloy. Here, a new strategy to construct pH-responsive nanocontainers (MSN-MBT@LDH) is demonstrated. The nanocontainers consist of corrosion inhibitor (2-mercaptobenzothiazole, MBT) loaded MSN core and layered double hydroxide (LDH) nanosheet shell serving as gatekeepers. The successful loading of MBT and encapsulation by LDH nanosheets were confirmed by a series of characterization such as scanning transmission electron microscopy coupled with energy dispersive X-ray spectroscopy (STEM-EDS) and N-2 adsorption/desorption isotherms. The pH-responsive feature of the nanocontainers was demonstrated by determination of the MBT concentration in buffer solutions with different pH values. A smart corrosion protection system on Mg alloy is obtained by incorporating the synthesized nanocontainers into a self-assembled nanophase particle (SNAP) coating. The electrochemical tests and visual observations show that the hybrid coating has the best barrier properties and robustness in corrosion protection in NaCl corrosive solutions in comparison with the control coatings. The present method simplifies the synthesis processes of nanocontainers and eliminates the potential detrimental effect of excess gatekeepers on the coating. The findings provide new insights into the preparation of scalable nanocontainers. The self-healing coatings are expected to have widespread applications for corrosion protection of Mg alloy and other metals. (C) 2020 Chongqing University. Publishing services provided by Elsevier B.V. on behalf of KeAi Communications Co. Ltd.

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