| GAO Yun,LI Xianghong,ZHU Ping,DENG Shuduan,XU Juan.Corrosion Inhibition Mechanism of Tween-80 on Steel in Cl3CCOOH[J],54(4):82-95 |
| Corrosion Inhibition Mechanism of Tween-80 on Steel in Cl3CCOOH |
| Received:March 25, 2024 Revised:August 13, 2024 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2025.04.006 |
| KeyWord:tween-80 steel TCA corrosion inhibition adsorption |
| Author | Institution |
| GAO Yun |
National and Local Joint Engineering Research Center for Efficient Utilization of Forestry Biomass Resources,College of Materials and Chemical Engineering, Southwest Forestry University, Kunming , China |
| LI Xianghong |
National and Local Joint Engineering Research Center for Efficient Utilization of Forestry Biomass Resources,College of Materials and Chemical Engineering, Southwest Forestry University, Kunming , China |
| ZHU Ping |
National and Local Joint Engineering Research Center for Efficient Utilization of Forestry Biomass Resources,College of Materials and Chemical Engineering, Southwest Forestry University, Kunming , China;Special Equipment Safety Inspection Research Institute of Yunnan, Kunming , China |
| DENG Shuduan |
National and Local Joint Engineering Research Center for Efficient Utilization of Forestry Biomass Resources,College of Materials and Chemical Engineering, Southwest Forestry University, Kunming , China |
| XU Juan |
National and Local Joint Engineering Research Center for Efficient Utilization of Forestry Biomass Resources,College of Materials and Chemical Engineering, Southwest Forestry University, Kunming , China |
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| Abstract: |
| The work aims to investigate the corrosion inhibition effect of the nonionic surfactant tween-80 on steel in trichloroacetic acid (Cl3CCOOH, TCA) medium and reveal its corrosion inhibition mechanism. The corrosion inhibition performance of tween-80 on steel in a 0.10 mol/L trichloroacetic acid (TCA) solution was analyzed by the weight loss method, the kinetic potential polarization curve method, and the electrochemical method. The conductivity and surface tension of tween-80 aqueous solution and trichloroacetic acid solution containing tween-80 before and after hanging of the steel samples were tested to explore the relationship between the corrosion inhibition solution and its corrosion inhibition performance. Atomic force microscopy (AFM), contact angle, X-ray photoelectron spectroscopy (XPS) and other analytical methods were used to determine the roughness, contact angle and composition of the protective film on the steel surface, so as to reflect the surface morphology, surface affinity/hydrophobicity, and chemical composition of the steel. The experimental results showed that tween-80 had good corrosion inhibition performance on steel in trichloroacetic acid medium. The corrosion inhibition rate was as high as 94.35% at a concentration of 5 mg/L at 20 ℃. The corrosion inhibition rate was greatly affected by the temperature, and the corrosion inhibition rate decreased sharply with the increase of temperature of 20, 30, 40 and 50 ℃ under the same conditions, and the corrosion inhibition rate significantly decreased when the temperature increased to 50 ℃ and the corrosion inhibition efficiency dropped significantly to 37.29%, which was less than 1/2 of 20 ℃. Through the comparison of various adsorption isotherms, the adsorption of tween-80 on the steel surface conformed to Langmuir monolayer adsorption modeling, and its standard adsorption Gibbs free energy (ΔG0) was −39~−31 kJ/mol, which was a mixed type of adsorption coexisting with physical adsorption and chemical adsorption. The electrochemical analysis showed that tween-80 was a kind of mixed corrosion inhibitor mainly inhibiting the anodic reaction, and the electrochemical mechanism controlled by charge transfer before and after the reaction did not change, and there was a diffusion effect during the reaction. Compared with 0.10 mol/L of trichloroacetic acid blank solution, after the addition of tween-80, the electric conductivity of the solution becomes larger, the surface tension decreases, the roughness of the corrosion inhibitor-treated steel surface decreases, and the hydrophobicity increases. XPS has detected the presence of four elements, C, O, Cl and Fe on the surface of the steel after corrosion inhibition, and further verified that tween-80 was physically and chemically adsorbed on the steel surface to form a protective layer. After the protonation reaction of —OH in tween-80 molecule, the surface of tween-80 molecule is positively charged, and the steel surface with some negative charge caused by adsorption of corrosive ions is manifested by the formation of electrostatic attraction to exhibit physical adsorption, while the chemical adsorption is caused by the coordination of O atoms and unsaturated bonds with lone pairs of electrons with the empty d-orbitals of Fe in the molecules of tween-80. Tween-80 is an efficient hybrid corrosion inhibitor. |
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