期刊
BIOELECTROCHEMISTRY
卷 143, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.bioelechem.2021.107969
关键词
Procyanidin B2; Corrosion resistance; Antibacterial activity; Green inhibitors; Inhibition mechanism
资金
- Natural Science Foundation of Shandong Province [ZR2020MB009, ZR2019MB009]
- Key Research and Development Program of Shandong Province [2019GSF108089]
- National Natural Science Foundation of China [21672046, 21372054]
- Huancui District of Weihai City
Flavonoids, alkaloids, glucosides, and tannins are natural components in plants with good corrosion inhibition properties. Procyanidin B2 (PCB2) isolated from Uncaria laevigata exhibits excellent corrosion inhibition on Q235 carbon steel, forming a protective film and blocking active corrosion sites, as well as demonstrating promising antimicrobial activity against various bacteria.
Flavonoids, alkaloids, glucosides and tannins with good corrosion inhibition are the main natural components in plants. In this work, procyanidin B2 (PCB2), a natural flavonoid, was firstly isolated from Uncaria laevigata. Corrosion inhibition, chemical reactivity and adsorption of PCB2 on Q235 carbon steel were described by experimental and theoretical studies. The inhibition performance of PCB2 as a green corrosion inhibitor was evaluated by electrochemical and gravimetric tests. The binding active sites and activities thereof on the steel surface were illustrated by quantum chemistry, and the equilibrium configuration was predicted by molecular dynamics simulation. PCB2 exhibits good corrosion inhibition on Q235 steel over a wide temperature range. The electrochemical results show that PCB2 is a mixed inhibitor, and its inhibition efficiency increases with the addition of PCB2 concentration. Moreover, the protective film is formed on the steel and the active corrosion sites are blocked significantly by surface analysis. Additionally, the theoretical calculation proves a strong interaction between PCB2 molecule and carbon steel. Besides, the antimicrobial activity was also preliminarily studied. This suggests that PCB2 exhibits better antimicrobial activity against many Gram-positive and Gram-negative bacteria. As a novel green corrosion inhibitor and antimicrobial agent, PCB2 is worthy of further exploitation. (c) 2021 Elsevier B.V. All rights reserved.
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