石油化工2025，Vol.54Issue(3)：355-363,9.DOI:10.3969/j.issn.1000-8144.2025.03.009
用于原油精馏塔中抑制铵盐腐蚀的一种硫脲缓蚀剂性能及其机理
Performance and mechanism of a thiourea-based corrosion inhibitor against ammonium salt corrosion in a crude oil distillation column
魏晓静 1闻小虎 1李小龙 2葛鹏莉 1龙武1
作者信息
- 1. 中国石化 西北油田分公司 缝洞型油藏提高采收率重点试验室,新疆 乌鲁木齐 830011
- 2. 中国石油集团工程材料研究院有限公司 油气钻采输送装备全国重点实验室,陕西 西安 710077
- 折叠
摘要
Abstract
N,N'-dibenzylthiourea(DBTU)was taken as a corrosion inhibitor and added to the NH4Cl solution for the corrosion of SAE1020 carbon steel.The inhibition mechanism of DBTU against NH4Cl corrosion was discussed through SEM and in-situ electrochemical testing.The first principles calculations and ab initio molecular dynamics simulations were also employed to deeply analyze the adsorption behavior of DBTU molecules on the Fe surface and their inhibitive effects on the NH4Cl corrosion process.The experimental results indicate that DBTU effectively enhances the interfacial impedance by simultaneously increasing the charge transfer resistance and the product layer resistance,thereby improving the compactness and uniformity of the product film to resist the penetration of the corrosive medium.When the DBTU concentration is 80 mg/L,the corrosion inhibition efficiency for SAE1020 carbon steel could reach approximately 95%.The primary active sites of the DBTU molecule are the S atom and the neighboring C atoms.On the Fe surface,DBTU adsorbs through four S—Fe bonds and one C—Fe bond.Therefore,the surface coverage of DBTU molecules is increased and the hydrolysis of NH4Cl is suppressed,which reduces the charge transfer rate of the corrosive medium.关键词
NH4Cl腐蚀/缓蚀剂/第一性原理/分子动力学Key words
NH4Cl corrosion/corrosion inhibitor/first principle/molecular dynamics分类
化学化工引用本文复制引用
魏晓静,闻小虎,李小龙,葛鹏莉,龙武..用于原油精馏塔中抑制铵盐腐蚀的一种硫脲缓蚀剂性能及其机理[J].石油化工,2025,54(3):355-363,9.
