李丛妮,李俊莉,李霁阳,黄瑾,张颖.醇醚基双咪唑啉缓蚀剂的性能及机理研究[J].表面技术,2020,49(8):302-308.
LI Cong-ni,LI Jun-li,LI Ji-yang,HUANG Jin,ZHANG Ying.Properties and Mechanism of Alcohol-ether-based Dimidazoline Corrosion Inhibitor[J].Surface Technology,2020,49(8):302-308 |
| 醇醚基双咪唑啉缓蚀剂的性能及机理研究 |
| Properties and Mechanism of Alcohol-ether-based Dimidazoline Corrosion Inhibitor |
| 投稿时间：2019-10-28 修订日期：2020-08-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2020.08.035 |
| 中文关键词: 缓蚀剂 醇醚羧酸 双咪唑啉 极化曲线 缓蚀性能 等温吸附 |
| 英文关键词:corrosive inhibiter alcohol ether carboxylic acid dimidazoline polarization curve corrosion inhibitor isothermal adsorption |
| 基金项目:陕西省重点研发计划项目（2017GY-171）；陕西延长石油（集团）有限责任公司基础研究项目（ycsy2017JCYJ-A-07） |
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| Author | Institution |
| LI Cong-ni | 1.Shaanxi Research Design Institute of Petroleum and Chemical Industry, Xi￠an 710054, China; 2.Shaanxi Provincial Key Laboratory of Petroleum Fine Chemicals, Xi￠an 710054, China |
| LI Jun-li | 1.Shaanxi Research Design Institute of Petroleum and Chemical Industry, Xi￠an 710054, China; 2.Shaanxi Provincial Key Laboratory of Petroleum Fine Chemicals, Xi￠an 710054, China |
| LI Ji-yang | 1.Shaanxi Research Design Institute of Petroleum and Chemical Industry, Xi￠an 710054, China; 2.Shaanxi Provincial Key Laboratory of Petroleum Fine Chemicals, Xi￠an 710054, China |
| HUANG Jin | 1.Shaanxi Research Design Institute of Petroleum and Chemical Industry, Xi￠an 710054, China; 2.Shaanxi Provincial Key Laboratory of Petroleum Fine Chemicals, Xi￠an 710054, China |
| ZHANG Ying | 1.Shaanxi Research Design Institute of Petroleum and Chemical Industry, Xi￠an 710054, China; 2.Shaanxi Provincial Key Laboratory of Petroleum Fine Chemicals, Xi￠an 710054, China |
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| 目的 模拟CO2强采工艺，研究醇醚基双咪唑啉缓蚀剂DIM-OE的缓蚀性能及机理，解决CO2对整个注采及地面集输系统的低碳钢设备的腐蚀问题。方法 采用傅里叶红外光谱仪对醇醚基双咪唑啉进行了分子结构表征，采用动态挂片法评价了DIM-OE在不同CO2分压、不同温度、不同质量浓度下对N80的缓蚀性能，采用动电位极化曲线研究了DIM-OE的电化学机理，采用扫描电镜和EDS分析了N80腐蚀后的表面形貌和元素含量。结果 随CO2分压的增加，N80的腐蚀速率显著增大。N80的腐蚀速率随腐蚀介质温度的升高先是增大，后又明显下降。随着DIM-OE质量浓度的增加，腐蚀速率逐渐减小，缓蚀率逐渐增大，最终均趋于稳定，腐蚀速率最小为0.063 mm/a，缓蚀率均达到90%以上。DIM-OE为抑制阳极为主的混合型缓蚀剂，其分子在N80表面的吸附为单分子层吸附，是物理吸附和化学吸附的共同作用。未加DIM-OE的N80表面腐蚀产物中的C、O元素质量分数较高，Fe元素的质量分数较低，腐蚀严重；加有200 mg/L DIM-OE的N80表面腐蚀产物中的C、O元素质量分数较低，Fe元素的质量分数较高，腐蚀较轻。结论 在CO2强采工艺条件下，DIM-OE缓蚀剂分子在N80表面可形成稳定的吸附层，有效地抑制CO2对N80钢片的腐蚀，具有较好的缓蚀作用。 |
| 英文摘要: |
| The work aims to solve the corrosion problem of low carbon steel equipment due to CO2 in the whole injection- production and surface gathering and transportation system by simulating CO2 intensive extraction process and studying the corrosion inhibition performance and mechanism of alcohol-ether-based dimidazoline DIM-OE. The molecular structure of alcohol-ether-based dimidazoline was characterized by Fourier infrared (FTIR) spectroscopy. The corrosion inhibition perfor-mance of DIM-OE to N80 at different CO2 partial pressure, different temperature and different mass concentration was evaluated by dynamic hanging method. The electrochemical mechanism of DIM-OE was studied by potentiodynamic polarization curves. The surface morphology and element content of N80 after corrosion were analyzed by scanning electron microscope (SEM) and Energy Dispersive Spectrometer (EDS). The corrosion rate of N80 increased significantly with the increase of CO2 partial pressure, but increased firstly and then decreased obviously with the increase of corrosion medium temperature. As the concentration of DIM-OE increased, the corrosion rate decreased gradually, the corrosion inhibition rate increased gradually, and finally tended to be stable. The minimum corrosion rate was 0.063 mm/a, and the corrosion inhibition rate was all above 90%. DIM-OE was a mixed corrosion inhibitor mainly inhibiting anode, and the adsorption of its molecules on N80 surface was monolayer adsorption, which was the interaction of physical adsorption and chemical adsorption. The weight percentage of C and O elements in N80 surface corrosion products without DIM-OE was high, and the weight percentage of Fe elements was low, so the corrosion was serious. The weight percentage of C and O in N80 surface corrosion product with 200 mg/L DIM-OE was lower, the weight percentage of Fe was higher, and the corrosion was lighter. Under the condition of CO2 intensive extraction, the DIM-OE corrosion inhibitor can form a stable adsorption layer on the surface of N80 and effectively inhibit the corrosion of N80 steel sheet by CO2 and have good corrosion inhibition effect. |
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