Achieving long-term anticorrosion via the inhibition of graphene's electrical activity

Due to its remarkable impermeability to gases, vapours, and liquids, graphene (G) is used as an excellent coating for metal protection. However, due to its high conductivity, recent studies have reported that G fails to prevent metal corrosion under long-term air exposure. Here, we obtained B-doped...

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Bibliographic Details
Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2019, Vol.7 (6), p.2864-2874
Main Authors: Ding, Jiheng, Zhao, Hongran, Ji, Dong, Xu, Beiyu, Zhao, Xinpeng, Wang, Zhen, Wang, Donglin, Zhou, Qingbo, Yu, Haibin
Format: Article
Language:English
Subjects:
Air exposure
Corrosion
Corrosion potential
Corrosion prevention
Corrosion resistance
Dopants
Durability
Electrical conductivity
Electrical resistivity
Electrons
Embedding
Fabrication
Galvanic corrosion
Gases
Graphene
Image resolution
Metals
Nanocomposites
Permeability
Polyurethane
Polyurethane resins
Protective coatings
Sheets
Sodium chloride
Spectra
Steel
Submerging
Zeta potential
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Summary:Due to its remarkable impermeability to gases, vapours, and liquids, graphene (G) is used as an excellent coating for metal protection. However, due to its high conductivity, recent studies have reported that G fails to prevent metal corrosion under long-term air exposure. Here, we obtained B-doped graphene (BG) and N-doped graphene (NG) with electron donating/withdrawing elements and then used them to modify the waterborne polyurethane (PU) resin. Our work reveals that embedding BG into a PU matrix greatly improves anticorrosion performance. The results revealed that graphene (BG) doped with electron accepting dopants exhibits a long-term corrosion resistance based on the suppression of galvanic corrosion, while graphene (NG) doped with electron donating dopants exhibits corrosion promotion due to its enhanced conductivity. Typically, the impedance modulus of BG/PU at Z f=0.01Hz was up to 10 8 Ω cm 2 , increasing by approximately three orders of magnitude compared to that of neat PU, G/PU, and NG/PU (∼10 6 Ω cm 2 ) after immersion for 240 h in 3.5 wt% NaCl (aq) . The present investigation provides important future implications for the fabrication of graphene-based anticorrosive coatings with excellent durability.
ISSN:2050-7488
2050-7496
DOI:10.1039/C8TA10337B