| LEI Ran,LI Xiang-hong,SHI Cheng-jie,TAN Zhao-yuan,ZHANG Fu.NP Inhibition Mechanism of Fagopyrum Esculentum Moench. Extract on Steel in HCl Media[J],52(1):162-177 |
| NP Inhibition Mechanism of Fagopyrum Esculentum Moench. Extract on Steel in HCl Media |
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| DOI：10.16490/j.cnki.issn.1001-3660.2023.01.017 |
| KeyWord:Fagopyrum esculentum Moench. extract cold rolled steel hydrochloric acid corrosion inhibition adsorption active ingredient |
| Author | Institution |
| LEI Ran |
College of Chemical Engineering,Kunming , China;Key Laboratory of National Forestry and Grassland Administration on Efficient Utilization of Forest Biomass Resources in Southwest China, Southwest Forestry University, Kunming , China |
| LI Xiang-hong |
College of Chemical Engineering,Kunming , China;Key Laboratory of National Forestry and Grassland Administration on Efficient Utilization of Forest Biomass Resources in Southwest China, Southwest Forestry University, Kunming , China |
| SHI Cheng-jie |
College of Chemical Engineering,Kunming , China;Key Laboratory of National Forestry and Grassland Administration on Efficient Utilization of Forest Biomass Resources in Southwest China, Southwest Forestry University, Kunming , China |
| TAN Zhao-yuan |
College of Chemical Engineering,Kunming , China;Key Laboratory of National Forestry and Grassland Administration on Efficient Utilization of Forest Biomass Resources in Southwest China, Southwest Forestry University, Kunming , China |
| ZHANG Fu |
College of Chemical Engineering,Kunming , China;Key Laboratory of National Forestry and Grassland Administration on Efficient Utilization of Forest Biomass Resources in Southwest China, Southwest Forestry University, Kunming , China |
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| Abstract: |
| The work aims to extract and prepare an environmentally friendly corrosion inhibitor, and study the corrosion inhibition performance of the inhibitor on cold rolled steel in 1.0 mol/L hydrochloric acid solution. Fagopyrum esculentum Moench. extract was obtained from Fagopyrum esculentum Moench. through ultrasonic extraction. The inhibition performance of Fagopyrum esculentum Moench. extract (FEME) on cold rolled steel in HCl media was investigated with weight loss and electrochemical techniques. The ultraviolet spectroscopy (UV), conductivity and surface tension of inhibited solution were measured. The micrographs, chemical compositions and hydrophilic/hydrophobic property of steel surfaces were characterized by scanning electron microscopy (SEM), atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR) and the hydrophilic/hydrophobic properties of steel surfaces were determined through contact angle measurements. The main components of FEME were fully analyzed, and then the effective components and mechanism of corrosion inhibition were explored in depth. The results showed that FEME exhibited efficient inhibition performance in 1.0 mol/L HCl. The inhibition efficiency of 100 mg/L FEME reached 90.1% at 30 ℃ in 1.0 mol/L HCl. The adsorption of FEME on CRS surface obeyed Langmuir adsorption isotherm, the standard Gibbs adsorption free energy (∆Go) was from –32 to –27 kJ/mol. FEME was a mixed-type inhibitor with “geometric blocking effect”. With the addition of FEME, the double capacitance at the steel/acid interface was dropped, while the charge transfer resistance increased significantly. SEM and AFM microstructures on the inhibited steel surface indicated that the corrosion degree was dropped apparently. Larger contact angles indicated the increase of hydrophobicity for the inhibited surface. FTIR and XPS confirmed that FEME could efficiently adsorb on steel surface to form the inhibitive film. The corrosion inhibitor film layer was mainly formed through the physical adsorption and chemical adsorption of FEME on the steel surface. FEME components contained a large number of —OH. The presence of —OH would cause these components to protonate, thus with the negatively charged steel surface through electrostatic gravity and adsorption, and the composition of the molecule contained a large number of O, N and other heteroatoms and unsaturated group structure, there were a large number of lone pairs of electrons can be ligated with the unoccupied d orbitals of Fe, thus producing the chemical adsorption of corrosion inhibitor on the steel surface. Compared with the inhibitor without immersion, the surface tension was increased. This was caused by the adsorption of some corrosion inhibitor molecules on the steel surface after immersion, resulting in a decrease in the concentration of corrosion inhibitor molecules in the bulk phase of the solution. For steel after corrosion immersion, the conductivity decreased significantly due to the consumption of H+. But after soaking of the steel surface in the corrosion inhibitor, the conductivity increased with the increase of FEME concentration, indicating that after the corrosion inhibitor was adsorbed on the steel surface, the corrosion reaction with the steel surface to reduce the consumption of H+ corrosion reaction. The corrosion inhibition rate of rutin at 100 mg/L reached a maximum of 57.8% at 20 ℃. The inhibition of FEME was better than that of its main component of rutin. The inhibitive mechanism of FEME was mainly attributed to the synergistic adsorption of flavonoids with other components. FEME is a highly efficient and environmentally friendly hybrid corrosion inhibitor. |
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