高芸,李向红,朱平,邓书端,徐娟.吐温-80对钢在Cl3CCOOH中的缓蚀作用机理[J].表面技术,2025,54(4):82-95.
GAO Yun,LI Xianghong,ZHU Ping,DENG Shuduan,XU Juan.Corrosion Inhibition Mechanism of Tween-80 on Steel in Cl3CCOOH[J].Surface Technology,2025,54(4):82-95 |
| 吐温-80对钢在Cl3CCOOH中的缓蚀作用机理 |
| Corrosion Inhibition Mechanism of Tween-80 on Steel in Cl3CCOOH |
| 投稿时间：2024-03-25 修订日期：2024-08-13 |
| DOI：10.16490/j.cnki.issn.1001-3660.2025.04.006 |
| 中文关键词: 吐温-80 钢 三氯乙酸 缓蚀 吸附 |
| 英文关键词:tween-80 steel TCA corrosion inhibition adsorption |
| 基金项目:国家自然科学基金(32360362，52161016);云南省基础研究计划杰出青年基金(202001AV070008);云南省农业基础研究联合专项重点项目(202301BD070001-158，202101BD070001-017);西南林业大学林业生物质资源高效利用技术国家地方联合工程研究中心(2023-GC09);云南省大学生创新创业训练计划(20210153041) |
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| 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 650224, 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 650224, 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 650224, China;Special Equipment Safety Inspection Research Institute of Yunnan, Kunming 650224, 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 650224, 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 650224, China |
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| 中文摘要: |
| 目的 探究非离子型表面活性剂吐温-80对钢在三氯乙酸(Cl3CCOOH，TCA)介质中的缓蚀作用规律，揭示缓蚀机理。方法 通过失重法、动电位极化曲线法、电化学法分析吐温-80在0.10 mol/L三氯乙酸溶液中对钢的缓蚀性能，测试缓蚀溶液的电导率及表面张力;并采用原子力显微镜(AFM)、接触角、X-射线光电子能谱(XPS)等方法分析钢的表面形貌、表面亲/疏水性、化学组成等。结果 吐温-80在三氯乙酸介质中对钢具有较好的缓蚀性能。当吐温-80质量浓度仅为5 mg/L，20 ℃时，其缓蚀率高达94.35%;缓蚀率受温度的影响较大，不同温度下缓蚀率由大到小为20、30、40、50 ℃，当温度升至50 ℃时其缓蚀率显著下降，最高仅为37.29%。吐温-80在钢表面的吸附符合Langmuir单分子吸附模型，其标准吸附Gibbs自由能(ΔG0)为−39~−31 kJ/mol，是物理吸附与化学吸附并存的混合型吸附;动电位极化曲线分析表明，吐温-80是一种以抑制阳极反应为主的混合型缓蚀剂;阻抗则说明加入吐温-80后，电荷转移电阻增大，双层电容值减小，在反应过程中存在弥散效应;吐温-80的存在使溶液的电导率变大，表面张力减小，钢表面粗糙度降低、疏水性增加。XPS进一步验证了吐温-80在钢表面发生吸附，并形成了一层缓蚀保护层。结论 吐温-80对钢在TCA介质中是一种高效的混合抑制型缓蚀剂。 |
| 英文摘要: |
| 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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