Aminobenzoic acid functionalized graphene oxide as environment-friendly corrosion inhibitors for Q235 steel in HCl solution: experimental and DFT studies

Baoguang Ma, Cheng Chen, Xiaojun Xie, Yanhui Chen, Qiuyu Zhang, Dong Lv, Zhenguo Liu

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Purpose: The purpose of this study is to provide effective and environmental-friendly corrosion inhibitors derived from graphene oxide for Q235 steel. Design/methodology/approach: Nontoxic and environment-friendly 4-aminobenzoic acid was used to functionalize graphene oxide via amidation and diazotization. The obtained amidation 4-aminobenzoic acid functionalized graphene oxide (PAGO) and diazotization 4-aminobenzoic acid functionalized graphene oxide (PDGO) were characterized by FTIR, Raman and TEM, while the inhibition efficiencies were analyzed by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization (PDP). Furthermore, theoretical inhibition efficiencies were investigated by density functional theory (DFT) approach. Findings: At a concentration of 40 ppm, the maximum inhibition efficiency of PAGO and PDGO were 97.90% and 96.72% in EIS measurement, respectively, which were in accordance with PDP data. Moreover, experimental results were supported by DFT-based quantum chemical calculation. Originality/value: Environmental-friendly PAGO and PDGO were synthesized successfully. The synthetic inhibitors exhibited excellent inhibition efficiencies in EIS and PDP measurements. Furthermore, a computational study using DFT supported the trend that PAGO was better inhibitor than PDGO.

Original languageEnglish
Pages (from-to)229-237
Number of pages9
JournalAnti-Corrosion Methods and Materials
Volume68
Issue number3
DOIs
StatePublished - 2021

Keywords

  • 4-Aminobenzoic acid
  • Corrosion inhibitors
  • Density functional theory
  • Graphene oxide

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