期刊
JOURNAL OF MOLECULAR LIQUIDS
卷 277, 期 -, 页码 330-340出版社
ELSEVIER
DOI: 10.1016/j.molliq.2018.12.095
关键词
Schiff base; Corrosion inhibitors; Carbon steel; Electrochemical measurement; Quantum chemistry study
资金
- National Nature Science Foundation of China [21266006, 61661014, 61627807]
- Nature Science Foundation of Guangxi Province [2016GXNSFAA380109, 2015GXNSFBA139041]
- Guangxi Middle and Young Teachers Basic Competence Improvement Project [2017KY0189]
- Guangxi Key Laboratory of Electrochemical and Magneto-chemical Functional Materials, Collaborative Innovation Center for Exploration of Hidden Nonferrous Metal Deposits and Development of New Materials in Guangxi
- Guangxi Zhuang Autonomous Region
Three new bis-Schiff bases, including bis(2-aminofluorene)glyoxal(L1), bis(2-aminofluorene) p-phthalaldehyde (L2) and bis(2-aminofluorene) 4,4'-biphenyldicarboxaldehyde (L3), were synthesized and characterized by Fourier transform infrared spectroscopy (FT-IR) and mass spectrometry (MS). Weight loss methods indicated that all these inhibitors have good resistance to 1.0 mol.L-1 hydrochloric acid corrosion, and the highest inhibition efficiency was 98.2% at 65 degrees C for L3. Polarization curves and electrochemical impedance spectroscopy (EIS) indicated that L3 exhibited excellent inhibition effect when concentration was 1.0 mmol.L-1. Moreover, the L3 was adsorbed spontaneously onto the surface by both physisorption and chemisorption, which followed the Langmuir adsorption isotherm. The relationship between molecular structure and quantum chemical structure parameters of three bis-Schiff base corrosion inhibitors was studied by Quantum chemistry calculation performed by density function theory (OFT) method. Results showed that L3 had excellent inhibition performance, which was consistent with experimental results. (C) 2018 Elsevier B.V. All rights reserved.
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