新型高效咪唑希夫碱缓蚀剂对Q235钢在1 mol/L HCl溶液中的缓蚀作用
Inhibition of Q235 Steel in 1 mol/L HCl Solution by a New Efficient Imidazolium Schiff Base Corrosion Inhibitor
王鹏杰 1宋昱灏 1樊林 1邓宽海 2李忠慧 3梅宗斌 4郭雷 5林元华6
作者信息
- 1. 西南石油大学油气藏地质及开发工程国家重点实验室 成都 610500;西南石油大学新能源与材料学院 成都 610500
- 2. 西南石油大学新能源与材料学院 成都 610500
- 3. 长江大学石油工程学院 武汉 434023
- 4. 四川华宇钻采装备有限公司 泸州 646000
- 5. 铜仁学院材料与化学工程学院 铜仁 554300
- 6. 西南石油大学油气藏地质及开发工程国家重点实验室 成都 610500;西南石油大学新能源与材料学院 成都 610500;长江大学石油工程学院 武汉 434023
- 折叠
摘要
以油酸、二乙烯三胺、碘代正丁烷和肉桂醛等为原料,在不同温度下进行酰胺化、脱水环化、季铵化等过程设计合成一种适用于酸洗工况的咪唑希夫碱(MIX)缓蚀剂,通过失重实验、电化学实验、理论模拟和表面分析等方法系统的探究了 MIX在1.00 mol/L HCl溶液中对Q235钢的缓蚀性能及其缓蚀机理.结果表明:在浓度为2.00 mmol/L时,采用失重实验,电化学阻抗(EIS),动电位极化(Tafel)测得的缓蚀效率分别为98.64％,96.93％和99.15％,表明MIX在HCl环境中能够发挥优异的缓蚀性能.电化学实验和等温吸附模型表明,MIX是一种阴极型缓蚀剂,能够自发吸附在Q235钢表面,且遵循Langmuir吸附等温模型.MIX能够在Q235钢表面形成稳定的保护膜,进一步阻碍了腐蚀体系内电荷转移速率.XPS,EDS和FT-IR分析证实了MIX分子能够吸附在Q235钢表面,密度泛函理论(DFT)说明MIX的活性位点为苯基,咪唑环上的N原子,分子动力学(MD)进一步证实了 MIX能够吸附在Q235钢表面.MIX在HCl环境中能够发挥优异的缓蚀性能,主要在于Q235钢表面形成了稳定的保护膜,降低了腐蚀体系内电荷转移速率.
Abstract
An imidazole Schiff base(MIX)corrosion inhibitor was synthesized via processes of ami-dation,dehydration cyclization,and quaternization at different temperatures with oleic acid,diethylenetri-amine,n-butane iodide and cinnamaldehyde as raw material.The corrosion inhibition performance and mechanism of MIX on Q235 steel in 1.00 mol/L HCl were systematically investigated by means of mass loss measurement,electrochemical testing,and surface analysis methods,as well as theoretical simula-tions.The results showed that the corrosion inhibition efficiency determined by mass loss method,electro-chemical impedance spectroscopy(EIS),and potentiodynamic polarization(Tafel)were 98.64％,96.93％,and 99.15％,respectively for adding a dose of MIX 2 mmol/L in the 2.00 mmol/L HCl solution,indicating that MIX can exhibit excellent corrosion inhibition performance in HCl environments.Electrochemical test-ing and isothermal adsorption models indicate that MIX is a cathodic corrosion inhibitor that can sponta-neously adsorb on the surface of Q235 steel,following the Langmuir adsorption isotherm model.MIX can form a stable protective film on the surface of Q235 steel,further hindering the charge transfer rate within the corrosion system.XPS,EDS and FT-IR analysis confirmed that MIX molecules may be adsorbed on the surface of Q235 steel.Density functional theory(DFT)showed that the active site of MIX was phenyl,and the N atom on the imidazole ring.Molecular dynamics(MD)further confirmed that MIX may be ad-sorbed on the surface of Q235 steel.MIX can exhibit excellent corrosion inhibition performance in HCl en-vironments,mainly due to the formation of a stable protective film on the surface of Q235 steel,which re-duces the charge transfer rate within the corrosion system.
关键词
咪唑希夫碱/电化学/失重实验/缓蚀性能/理论计算Key words
imidazole Schiff base/electrochemistry/mass loss experiment/corrosion inhibition per-formance/theoretical calculation引用本文复制引用
基金项目
国家自然科学基金(52074232)
四川省自然科学基金(2022NSFSC0028)
中国博士后科学基金(2022M710117)
四川省青年科学基金(2022NSFSC0994)
出版年
2024
NETL
NSTL
维普
万方数据