在动态H<sub>2</sub>S/CO<sub>2</sub>体系中疏水链上的双键对咪唑啉衍生物缓蚀性能的影响

doi:10.11902/1005.4537.2014.247

中国腐蚀与防护学报

2015, Vol. 35

Issue (6): 505-509 DOI: 10.11902/1005.4537.2014.247

研究报告

本期目录 | 过刊浏览

在动态H₂S/CO₂体系中疏水链上的双键对咪唑啉衍生物缓蚀性能的影响

赵景茂^1,²(

),赵雄¹,姜瑞景^1,²

1. 北京化工大学材料科学与工程学院北京 100029
2. 北京化工大学材料电化学过程与技术北京市重点实验室北京 100029

Effect of Double Bonds in Hydrophobic Chains on Corrosion Inhibition Performance of Imidazoline Derivates in Dynamic H₂S/CO₂ Environment

Jingmao ZHAO^1,²(

),Xiong ZHAO¹,Ruijing JIANG^1,²

1. College of Material Science and Engineering,Beijing University of Chemical Technology, Beijing 100029, China
2. Beijing Key Laboratory of Electrochemical Process and Technology for Materials, Beijing 100029, China

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摘要:

分别用硬脂酸、油酸、山俞酸和芥酸4种脂肪酸与二乙烯三胺合成了4种咪唑啉化合物。通过动态失重、SEM、接触角、原子力力曲线和分子动力学模拟等分析表征手段,研究了它们在动态H₂S/CO₂体系中对碳钢的缓蚀性能及其在20#碳钢表面上的吸附能力与疏水能力。结果表明,疏水链上带有双键的咪唑啉衍生物疏水效果更好,疏水链带有双键的咪唑啉衍生物其粘附力更大。用分子动力学模拟计算出4种咪唑啉衍生物在Fe (001) 表面的吸附能,疏水链中带有双键的咪唑啉的吸附能都要大于疏水链中没有双键的咪唑啉的吸附能。4种缓蚀剂缓蚀性能的理论评价结果与实验结果吻合。

关键词 ： H2S/CO2体系, 咪唑啉, 接触角, 分子动力学模拟

Abstract：

Four imidazoline derivates were synthesized using diethylenetriamine with stearic acid, oleic acid, n-docosanoic acid and erucic acid respectively as raw materials. Then the inhibition performance and adsorption capacity on the carbon steel surface and the ability of hydrophobic of the prepared derivates were studied in dynamic H₂S/CO₂ environment by means of dynamic weight loss test, SEM, AFM, contact angle measurement and molecular dynamics simulation. The measurememnt results for contact angle and AFM force showed that the hydrophobic effect is better and the adhesion force is bigger respectively for imidazoline derivatives with double bonds in their hydrophobic chains. The surface adsorption energy of the four imidazoline derivatives on the face of Fe (001) were calculated by using molecular dynamic simulation, the results indicated that the surface adsorption energy of imidazoline which has double bonds in hydrophobic chain was larger than that one without double bonds. The theoretical evaluation of corrosion inhibition performance of four imidazoline derivates accorded well with the experiment results.

Key words： H2S/CO2 environment imidazoline contact angle measurement molecular dynamics simulation

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引用本文:

赵景茂,赵雄,姜瑞景. 在动态H₂S/CO₂体系中疏水链上的双键对咪唑啉衍生物缓蚀性能的影响[J]. 中国腐蚀与防护学报, 2015, 35(6): 505-509.
Jingmao ZHAO, Xiong ZHAO, Ruijing JIANG. Effect of Double Bonds in Hydrophobic Chains on Corrosion Inhibition Performance of Imidazoline Derivates in Dynamic H₂S/CO₂ Environment. Journal of Chinese Society for Corrosion and protection, 2015, 35(6): 505-509.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2014.247 或 https://www.jcscp.org/CN/Y2015/V35/I6/505

图1 4种咪唑啉衍生物的IR谱

表1 在H2S/CO2溶液中加入不同咪唑啉后试片的腐蚀速率和缓蚀率

表2 吸附了缓蚀剂的碳钢表面的接触角

图2 试片表面测得的AFM力曲线

图3 加入不同缓蚀剂后试片表面的腐蚀产物形貌

图4 咪唑啉在Fe表面的吸附构型

表3 缓蚀剂分子在Fe (001) 面的吸附能

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