An Exemplar Imidazoline Surfactant for Corrosion Inhibitor Studies: Synthesis,Characterization, and Physicochemical Properties

An optimized one-pot recipe has been developed to synthesize a surfactant molecule, referred to as OMID, consisting of an imidazoline head group and aliphatic tail, which is an exemplar corrosion inhibitor for carbon steel in acidic solutions. As evidenced by gas chromatography, ¹H and ¹³C nuclear magnetic resonance, and Fourier-transform infrared data, a high-purity product was achieved without the use of either a solvent or catalyst. Critical micelle concentration values and corrosion inhibition efficiencies ( η %) were determined in aqueous solutions of hydrochloric acid and sulfuric acid using surface tensiometry and linear polarization resistance measurements, respectively. Hydrolysis of the imidazoline head group as a function of pH (0–11) was explored with ultraviolet–visible absorption spectroscopy. In addition, N 1s and C 1s X-ray photoelectron spectroscopy data were acquired from both surface-adsorbed OMID and a multilayer of the imidazoline head group of OMID. These latter data are highly relevant to those attempting to understand OMID inhibition chemistry.     

咪唑啉型缓蚀剂的合成及其缓蚀机理的研究

以棕榈酸、二乙烯三胺、马来酸酐为原料合成了一种咪唑啉型缓蚀剂YQ-01,与YQ-02复配后得到能有效抑制二氧化碳腐蚀的缓蚀体系YQ-03。应用静态挂片失重法、电化学极化曲线、X射线光电子能谱分析研究了YQ-03抑制二氧化碳腐蚀的电化学特征,分析了腐蚀前、后及加入缓蚀体系YQ-03后A3钢的表面产物,探讨了YQ-03的缓蚀机理。结果表明,由主剂YQ-01和助剂YQ-02组成的复配缓蚀体系有良好的协同作用,腐蚀产物膜有3层,能有效抑制饱和CO2的高矿化度盐水对A3钢的腐蚀。     

新型咪唑啉衍生物油田注水缓蚀剂的研究

使用长链脂肪酸、多胺、甲醛和三氯化磷等为原料合成了咪唑啉有机膦酸类缓蚀剂。在模拟油田注水条件下，采用静态挂片、极化曲线和交流阻抗等测试方法评价了缓蚀剂的缓蚀性能，并对缓蚀剂的成膜机理进行了一些研究与探讨。     

Investigation into the evolution of corrosion product layer (CPL) of 1018 C-steel exposed to multiphase environment using FIB and EIS techniques

This communication reports into the effects of flow, fluid composition and the effectiveness of imidazoline inhibitors on the evolution and distribution of corrosion products on 1018 C-steel exposed to CO₂ corrosion. Focused ion beam technique was used to measure the thickness of the corrosion product layer (CPL), in contrast to the conventional techniques used to observe the cross-section of specimens. Morphological analysis using scanning electron microscopy revealed topographical variations on the surface with the change in the multiphase environment. The CPL was found to be more porous in nature with the presence of oil in the multiphase environment. Electrochemical impedance spectroscopy was also used in the present study to measure the corrosion rates and was subsequently correlated to the CPL evolution for 1018 C-steel in multiphase environment.     

咪唑啉对碳钢在弱酸性H2S溶液中的缓蚀作用

应用计算机控制的电位扫描法研究了油溶性咪唑啉类慢剂对碳钢在弱性性Ｈ２Ｓ水溶液中的缓蚀作用,并采用三参数拟合方法对阴阳极极化曲线进行拟合计算。     

烷基酰胺两性表面活性剂的合成研究

合成了十一烷基咪唑啉环的水解产物仲酰胺和叔酰胺,用氯乙酸钠与酰胺化合物反应得到酰胺两表面活性剂,考察其水溶液泡沫高度和表面张力以及共复配物的表面性质,发现叔酰胺的季胺化产品起泡力最大,其γ_(min)与咪唑啉型两性表面活性剂的γ_(min)相近;不同混合比仲酰胺的和叔叔酰胺的季胺化物水溶液的泡沫高度和表面张力没有明显的变化。     

水溶性咪唑啉季铵盐缓蚀剂的复配研究

利用正交实验方法对复配缓蚀剂进行了开发与研究,以环烷酸和多乙烯多胺合成的缓蚀剂为主要成份,再与表面活性剂、螯合物、有机胺和自制液进行复配而得;采用多元二次回归方程式对合成产物腐蚀速率与操作因素的关系进行回归;用非线性规化确定出实验范围内腐蚀速率最小的适宜复配操作条件:表面活性剂用量为0.112 6(与合成缓蚀剂的质量比,下同),螯合剂用量为0.010 2,有机胺用量为0.213 9,自制液用量为0.357 2。验证实验结果表明,在最适宜的实验配比下所得产品其水溶性好、腐蚀速率慢、缓蚀率高达99%以上。     

适用于孤东油田油井管杆的长效缓蚀剂体系优选研究

针对孤东油田油井管杆腐蚀的特点,对长效缓蚀剂体系进行了室内研究。采用静态挂片失重法优选出母体缓蚀剂的种类为胜利咪唑啉,加量为50 mg/L;选择了阻垢剂(HEDP)、除氧剂(硫脲)、杀菌剂(阳离子杀菌剂)等添加剂;利用三因素三水平正交实验方法优选出适用于孤东油田油井管杆的长效缓蚀剂体系(GD)的基本配方组成:48%胜利咪唑啉+28%HEDP+14%硫脲+10%阳离子杀菌剂。     

环烷基咪唑啉衍生物在酸性溶液中对碳钢挂片缓蚀性能的研究

针对环烷基咪唑啉衍生物,采用碳钢挂片失重法,探讨了其在HCl、H2SO4、H3PO4、HF等酸性溶液中的溶解性能和缓蚀性能。     

氨基磺酸溶液中烷基咪唑啉缓蚀性能的影响因素研究

研究了2-十一烷基-N-羧甲基-N-羟乙基咪唑啉(UHCI)在氨基磺酸溶液中对碳钢的缓蚀影响因素。结果表明在8%(wt)的氨基磺酸溶液中加入0.4%(wt)的UHCI,在温度为60℃、流速为0.36 m/s、Fe3+浓度为300 mg/L,酸洗时间为4h时的腐蚀速率为0.989 1 g/(m2.h),缓蚀效率达到92.5%以上。说明该烷基咪唑啉性能稳定,在高温、流动的条件下仍然具有较好的缓蚀效果。