期刊
ELECTROCHIMICA ACTA
卷 330, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2019.135186
关键词
Mg alloy; Corrosion; Coating; Layered double hydroxide
资金
- Young Elite Scientists Sponsorship Program by China Association for Science and Technology (YESS) [2018QNRC001]
- National Natural Science Foundation of China (NSFC) [51501157]
- Sichuan Science and Technology Program [2018JY0483]
- Binghamton University Integrated Electronics Engineering Center
- National Science Foundation
- PALS
A new thiophene derivative corrosion inhibitor (CI) was developed to functionalize the layered double hydroxide (LDH) primer on Mg alloy to enhance corrosion protection. Compared with bare LDH coating, the composite coatings consisting of a MgAl-LDH primer and an outer CI layer showed highly compact surface structures without large pores and gaps, thereby indicating the enhanced capability to resist the penetration of corrosive species. Electrochemical tests revealed that the MgAl-LDH film modified with the newly synthesized CI exhibited higher charge transfer resistance and lower corrosion current density than films modified with commercial CIs. The highest enhancement in corrosion resistance was linked to the film's ability to repair physical damage by forming precipitates through chemical complexation and adsorption of the CIs. These findings open up new opportunities for the design and synthesis of a thiophene-contained inhibitor to modify LDH films and to obtain a composite coating with superior corrosion protection. (C) 2019 Elsevier Ltd. All rights reserved.
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