4.7 Article

The sandwich-like structures of polydopamine and 8-hydroxyquinoline coated graphene oxide for excellent corrosion resistance of epoxy coatings

期刊

JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 565, 期 -, 页码 436-448

出版社

ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2020.01.051

关键词

Graphene oxide; Corrosion resistance; Corrosion inhibitor; 8-hydroxyquinoline; Electrochemical measurements

资金

  1. National Key Research and Development Program of China [2017YFA0700100]
  2. National Nature Science Foundation of China [51572260, 21520102001, 21671188]
  3. Strategic Priority Research Program of the Chinese Academy of Sciences of China [XDB20000000]
  4. Key Research Program of the Chinese Academy of Sciences of China [QYZDJ-SSW-SLH045]

向作者/读者索取更多资源

A novel sandwich-like structure material was exploited for the fabrication of an effective corrosion resistance system. An environmentally friendly composite material was synthesized by installing 8-hydroxyquinoline (8-HQ) on the surface of graphene oxide (GO). In order to prevent leakage of corrosion inhibitor 8-HQ GO/8-HQ was modified by polydopamine (PDA), denoted as GO/8-HQJPDA. A sandwich-like structure (GO/8-HQJPDA) enables long-term stable storage of corrosion inhibitor in the protective matrix. Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM) were utilized to verify the sandwich-like structure of GO/8-HQJPDA. The electrochemical tests in a 3.5 wt% NaCl solution showed that the addition of well-dispersed GO/8-HQ/ PDA into epoxy system (GO/8-HQJPDA-EP) remarkably improved corrosion protection of AZ31 b magnesium alloy compared with pure epoxy (EP) coating. The sandwich structure protects the activity and structural integrity of the corrosion inhibitor (8-HQ). The corrosion inhibitor (8-HQ) of the GO/8-HQJ PDA sandwich structure cuts off the ion exchange between the metal alloy and the electrolyte solution, which hinders the electrochemical corrosion of the metal. A possible corrosion resistance mechanism of GO/8-HQJPDA is fully discussed. This study provides feasibilities for the immobilization of corrosion inhibitors on the metal surface. (C) 2020 Elsevier Inc. All rights reserved.

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