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

Journal of Magnesium and Alloys 2022年第3期10卷 904-919页

作者： Yuejun Ouyang Lin-Xin Li Zhi-Hui Xie Lili Tang Fuhui Wang Chuan-Jian Zhong Hunan Engineering Laboratory for Preparation Technology of Polyvinyl Alcohol(PVA)Fiber Material Huaihua UniversityHuaihua 418000PR China Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province/Institute of Synthesis and Application of Functional Materials College of Chemistry and Chemical EngineeringChina West Normal UniversityNanchong 637002PR China Shenyang National Laboratory for Materials Science Northeastern University3-11 Wenhua RoadShenyang 110819PR China Department of Chemistry State University of New York at BinghamtonBinghamtonNY 13902USA

The preparation of pH-responsive nanocontainer. 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 ***,a new strategy to construct pH-responsive nanocontainer.(MSN-MBT@LDH)is *** nanocontainer. consist of corrosion inhibitor(2-mercaptobenzothiazole,MBT)loaded MSN core and layered double hydroxide(LDH)nanosheet shell serving as *** 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 N2 adsorption/desorption *** pH-responsive feature of the nanocontainer. 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 nanocontainer. into a self-assembled nanophase particle(SNAP)*** 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 *** present method simplifies the synthesis processes of nanocontainer. and eliminates the potential detrimental effect of excess gatekeepers on the *** findings provide new insights into the preparation of scalable *** self-healing coatings are expected to have widespread applications for corrosion protection of Mg alloy and other metals.

关键词： Mg alloy Coating Corrosion Layered double hydroxide nanocontainer.

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