表面技术2025，Vol.54Issue(4)：82-95,14.DOI:10.16490/j.cnki.issn.1001-3660.2025.04.006
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
摘要
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.关键词
吐温-80/钢/三氯乙酸/缓蚀/吸附Key words
tween-80/steel/TCA/corrosion inhibition/adsorption分类
矿业与冶金引用本文复制引用
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):82-95,14.基金项目
国家自然科学基金(32360362,52161016) （32360362,52161016）
云南省基础研究计划杰出青年基金(202001AV070008) （202001AV070008）
云南省农业基础研究联合专项重点项目(202301BD070001-158,202101BD070001-017) （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) （2023-GC09）
云南省大学生创新创业训练计划(20210153041) National Natural Science Foundation of China(32360362,52161016) （20210153041）
Joint Key Project of Agricultural Fundamental Research in Yunnan Province(202301BD070001-158,202101BD070001-017) （202301BD070001-158,202101BD070001-017）
Fund Project of National Joint Engineering Research Center for Highly-Efficient Utilization Technology of Forestry Resources,Southwest Forestry University(2023-GC09) （2023-GC09）
Yunnan University Student Innovation and Entrepreneurship Training Program(20210153041). （20210153041）
