咪唑啉衍生物与硫脲对<strong>X65</strong>钢在惰性沉积物垢下腐蚀的缓蚀机理研究

doi:10.11902/1005.4537.2025.063

中国腐蚀与防护学报

2026, Vol. 46

Issue (1): 220-232 CSTR: 32134.14.1005.4537.2025.063 DOI: 10.11902/1005.4537.2025.063

研究报告

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咪唑啉衍生物与硫脲对X65钢在惰性沉积物垢下腐蚀的缓蚀机理研究

盖明月¹, 张静¹^,²(

), 王崇坤¹, 李秀美¹

^1.中国海洋大学化学化工学院青岛 266100
^2.中国海洋大学海洋化学理论与工程技术教育部重点实验室青岛 266100

Corrosion Inhibition Performance of Imidazoline Derivatives and Thiourea on X65 Steel Under Inert Deposits Scale in an Artificial CO₂ Saturated Oilfield Produced Water

GAI Mingyue¹, ZHANG Jing¹^,²(

), WANG Chongkun¹, LI Xiumei¹

^1.College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China
^2.Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China

引用本文:

盖明月, 张静, 王崇坤, 李秀美. 咪唑啉衍生物与硫脲对X65钢在惰性沉积物垢下腐蚀的缓蚀机理研究[J]. 中国腐蚀与防护学报, 2026, 46(1): 220-232.
Mingyue GAI, Jing ZHANG, Chongkun WANG, Xiumei LI. Corrosion Inhibition Performance of Imidazoline Derivatives and Thiourea on X65 Steel Under Inert Deposits Scale in an Artificial CO₂ Saturated Oilfield Produced Water[J]. Journal of Chinese Society for Corrosion and protection, 2026, 46(1): 220-232.

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摘要:

针对在CO₂饱和油田采出水中由于惰性沉积物引起的X65钢的垢下腐蚀问题，通过电化学和表面分析等手段研究了烷基咪唑啉(IM)、硫脲(TU)及两者复配缓蚀剂(TU/IM)对SiO₂和CaCO₃惰性沉积物下X65钢的缓蚀行为。结果表明，在两种惰性沉积物下，缓蚀效率均为η (TU/IM) > η (TU) > η (IM)。IM难以在两种沉积物下形成连续的保护性缓蚀剂膜，且会加速SiO₂垢下金属的腐蚀，缓蚀性能较差。TU是抑制阴极和阳极反应的混合缓蚀剂，TU中的S原子与Fe原子的空d轨道形成配位化学键，成为富电子区，形成的Fe—S键增强了缓蚀剂膜层的稳定性与保护性。IM与TU复配后形成良好的协同作用，TU依靠良好的扩散性和吸附性能形成了第一层吸附膜，IM则提供疏水链成为第二层吸附膜，因此具有更优异的缓蚀效果。

关键词 ：咪唑啉衍生物, 惰性沉积物, 垢下腐蚀, 协同作用, 吸附膜

Abstract：

To solve the problem of under-deposit corrosion of X65 steel in CO₂-saturated oilfield-produced water, the corrosion inhibition performance of alkyl imidazolines (IM), thiourea (TU) and their compound corrosion inhibitors (TU/IM) on X65 steel under SiO₂ and CaCO₃ inert deposits was investigated using electrochemical analysis and surface analysis. The results show that the corrosion inhibition efficiency η of the three inhibitors may be ranked as η (TU/IM) > η (TU) > η (IM). When adopting IM as inhibitor, the formation of a continuous protective corrosion inhibitor film is difficulty on the steel surface under the two type scales of inert deposits, while the corrosion of metal under the SiO₂ deposits is accelerated, thus IM is poor in corrosion inhibition performance. For TU as a mixed-type inhibitor, both the cathodic and anodic reactions are suppressed, which may be due to that the S atoms of TU tend to coordinate with the empty d-orbitals of Fe atoms, thereby generate coordination chemical bonds, resulting in an electrons rich band in this region, which in turn enhance the stability and protection ability of the formed inhibitor film. Whereas, the TU/IM combination inhibitor demonstrate excellent synergistic inhibition effect, which may be ascribed to that TU initially formed a primary adsorption film on the steel through its superior diffusivity and adsorption capacity, while IM subsequently contributed hydrophobic chains to establish a secondary adsorption film, this dual-layered structure significantly enhances the corrosion inhibition effectiveness.

Key words： imidazoline derivatives inert deposits under-deposit corrosion synergistic effects adsorption films

收稿日期: 2025-02-25 32134.14.1005.4537.2025.063

ZTFLH:

TG174

基金资助:山东省自然科学基金(ZR2019MEM003)

通讯作者: 张静，E-mail：dmh217@ouc.edu.cn，研究方向为海洋腐蚀与防护

作者简介: 盖明月，女，1999年生，硕士生

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https://www.jcscp.org/CN/10.11902/1005.4537.2025.063 或 https://www.jcscp.org/CN/Y2026/V46/I1/220

图1 覆盖SiO2和CaCO3惰性沉积物的工作电极

图2 IM和TU的分子结构式

图3 以覆盖SiO2和CaCO3惰性沉积物的X65钢为工作电极的电化学测试装置示意图

图4 SiO2垢下电极在不同浓度的IM缓蚀溶液中浸泡72 h的EIS谱图

图5 用于拟合EIS的等效电路图

表1 SiO2垢下电极在不同浓度的IM缓蚀剂溶液中的EIS谱拟合数据

图6 SiO2垢下电极在TU/IM不同复配比例缓蚀溶液中浸泡72 h的EIS谱图

表2 SiO2垢下电极在TU/IM不同复配比例缓蚀溶液中浸泡72 h的EIS谱拟合结果

图7 25 ℃下垢下电极在CO2饱和的空白溶液以及含100 mg/L缓蚀溶液中浸泡72 h后的动电位极化曲线

表3 图7动电位极化曲线拟合结果

图8 SiO2垢下电极在空白溶液及不同缓蚀溶液中浸泡不同时间后的EIS谱图

表4 SiO2沉积物覆盖下的电极在空白溶液及缓蚀溶液中浸泡不同时间的EIS谱拟合结果

图9 CaCO3垢下电极在空白溶液及不同缓蚀溶液中浸泡不同时间后的EIS谱图

表5 CaCO3 沉积物覆盖下的电极在空白溶液及缓蚀溶液中浸泡不同时间的EIS谱拟合结果

图10 SiO2垢下电极在空白溶液及不同缓蚀溶液中浸泡72 h后腐蚀形貌

表6 SiO2垢下电极在空白溶液及不同缓蚀溶液中浸泡72 h后表面EDS结果

图11 CaCO3垢下电极在空白溶液及不同缓蚀溶液中浸泡72 h后腐蚀形貌

表7 CaCO3垢下电极在空白溶液及不同缓蚀溶液中浸泡72 h后表面EDS结果 (atomic fraction / %)

图12 SiO2垢下电极在不同缓蚀溶液中浸泡72 h后的XPS谱图

图13 CaCO3垢下电极在不同缓蚀溶液中浸泡72 h后的XPS谱图

图14 3种缓蚀剂对 SiO2 和 CaCO3 垢下X65碳钢的缓蚀机理示意图

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